Multichassis link aggregation (M-LAG) virtualizes two physical devices into one system through multichassis link aggregation. The standard for M-LAG is IEEE P802.1AX-REV™/D4.4c, Draft Standard for Local and Metropolitan Area Networks.

Prerequisites

The configuration examples were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

The following information is provided based on the assumption that you have basic knowledge of M-LAG.

Example: Configuring M-LAG at the access Layer

Network configuration

As shown in Figure 1:

· Configure Device A and Device B as an M-LAG system to establish one multichassis aggregate link with Device F and one with Device C and Device D.

· Set up a keepalive link between Twenty-FiveGigE 1/0/5 of Device A and Twenty-FiveGigE 1/0/5 of Device B, and exclude the interfaces from the shutdown action by M-LAG MAD.

· Configure two VRRP groups on Device C and Device D to provide gateway services for VLAN 10 and VLAN 20.

¡ Configure VRRP group 1 to provide gateway services for hosts in VLAN 10 (Area A). Add Device C and Device D to the group as the master and backup devices, respectively.

¡ Configure VRRP group 2 to provide gateway services for hosts in VLAN 20 (Area B). Add Device D and Device C to the group as the master and backup devices, respectively.

· Configure OSPF on Device C, Device D, and Device E for the hosts to communicate with external networks at Layer 3.

Figure 1 Network diagram

Device	Interface	IP address	Device	Interface	IP address
Device A	WGE 1/0/5	1.1.1.1/24	Device B	WGE1/0/5	1.1.1.2/24
Device C	VLAN-interface 100	100.1.1.1/24	Device D	VLAN-interface 100	200.1.1.1/24
	VLAN-interface 10	10.1.1.1/24		VLAN-interface 10	10.1.1.2/24
	VLAN-interface 20	20.1.1.1/24		VLAN-interface 20	20.1.1.2/24
	Virtual IP 1	10.1.1.100/24		Virtual IP 1	10.1.1.100/24
	Virtual IP 2	20.1.1.100/24		Virtual IP 2	20.1.1.100/24
Device E	VLAN-interface 100	100.1.1.2/24
	VLAN-interface 200	200.1.1.2/24
	VLAN-interface 30	30.1.1.1/24

Analysis

For the secondary M-LAG device to monitor the state of the primary device, establish a Layer 3 keepalive link between the M-LAG member devices.

To balance traffic between two VRRP gateway devices, you can assign them to two VRRP groups with different priorities. In this example, Device C is assigned a higher priority than Device D in VRRP group 1 so Device C can become the master in this group. Device D is assigned a higher priority than Device C in VRRP group 2 so Device D can become the master in this group.

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6550X-HI series	Release 1213P51 and later
S6880 series	Release 1213P51 and later
S9820-8M	Release 1213P51 and later
S5580X-HI series	Release 1213P50 and later
S5580X-EI series	Release 1213P50 and later
S5580S-EI series	Release 1213P50 and later

Restrictions and guidelines

M-LAG restrictions and guidelines

For the M-LAG member devices to be identified as one M-LAG system, you must configure the same M-LAG system MAC address and M-LAG system priority on them. You must assign different M-LAG system numbers to the M-LAG member devices.

An M-LAG member device can have only one peer link.

For correct keepalive detection, you must exclude the interfaces used for keepalive detection from the shutdown action by M-LAG MAD.

VRRP restrictions and guidelines

You cannot specify the virtual IP address as any of the following IP addresses:

· All-zero address (0.0.0.0).

· Broadcast address (255.255.255.255).

· Loopback address.

· IP address of other than Class A, Class B, and Class C.

· Invalid IP address (for example, 0.0.0.1).

The virtual IP address of an IPv4 VRRP group must be on the same subnet as the downlink interface IP addresses of the VRRP group members to ensure successful traffic forwarding.

Procedures

Configuring Device A

# Configure M-LAG system settings.

<DeviceA> system-view

[DeviceA] m-lag system-mac 1-1-1

Changing the system MAC might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

[DeviceA] m-lag system-number 1

Changing the system number might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

[DeviceA] m-lag system-priority 123

Changing the system priority might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

# Configure M-LAG keepalive packet parameters.

[DeviceA] m-lag keepalive ip destination 1.1.1.2 source 1.1.1.1

# Configure Twenty-FiveGigE 1/0/5 as a routed (Layer 3) interface and assign the interface an IP address. The IP address will be used as the source IP address of keepalive packets.

[DeviceA] interface twenty-fivegige 1/0/5

[DeviceA-Twenty-FiveGigE1/0/5] port link-mode route

[DeviceA-Twenty-FiveGigE1/0/5] ip address 1.1.1.1 24

[DeviceA-Twenty-FiveGigE1/0/5] quit

# Exclude the interface used for M-LAG keepalive detection (Twenty-FiveGigE 1/0/5) from the shutdown action by M-LAG MAD.

[DeviceA] m-lag mad exclude interface twenty-fivegige 1/0/5

# Create VLAN 10 and VLAN 20.

[DeviceA] vlan 10

[DeviceA-vlan10] quit

[DeviceA] vlan 20

[DeviceA-vlan20] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 1.

[DeviceA] interface bridge-aggregation 1

[DeviceA-Bridge-Aggregation1] link-aggregation mode dynamic

[DeviceA-Bridge-Aggregation1] quit

# Assign Twenty-FiveGigE 1/0/6 and Twenty-FiveGigE 1/0/7 to aggregation group 1.

[DeviceA] interface twenty-fivegige 1/0/6

[DeviceA-Twenty-FiveGigE1/0/6] port link-aggregation group 1

[DeviceA-Twenty-FiveGigE1/0/6] quit

[DeviceA] interface twenty-fivegige 1/0/7

[DeviceA-Twenty-FiveGigE1/0/7] port link-aggregation group 1

[DeviceA-Twenty-FiveGigE1/0/7] quit

# Set the link type of Bridge-Aggregation 1 to trunk and assign it to VLAN 10 and VLAN 20.

[DeviceA] interface bridge-aggregation 1

[DeviceA-Bridge-Aggregation1] port link-type trunk

Configuring Twenty-FiveGigE1/0/6 done.

Configuring Twenty-FiveGigE1/0/7 done.

[DeviceA-Bridge-Aggregation1] port trunk permit vlan 10 20

Configuring Twenty-FiveGigE1/0/6 done.

Configuring Twenty-FiveGigE1/0/7 done.

[DeviceA-Bridge-Aggregation1] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 3.

[DeviceA] interface bridge-aggregation 3

[DeviceA-Bridge-Aggregation3] link-aggregation mode dynamic

[DeviceA-Bridge-Aggregation3] quit

# Assign Twenty-FiveGigE 1/0/3 and Twenty-FiveGigE 1/0/4 to aggregation group 3.

[DeviceA] interface twenty-fivegige 1/0/3

[DeviceA-Twenty-FiveGigE1/0/3] port link-aggregation group 3

[DeviceA-Twenty-FiveGigE1/0/3] quit

[DeviceA] interface twenty-fivegige 1/0/4

[DeviceA-Twenty-FiveGigE1/0/4] port link-aggregation group 3

[DeviceA-Twenty-FiveGigE1/0/4] quit

# Specify Bridge-Aggregation 3 as the peer-link interface.

[DeviceA] interface bridge-aggregation 3

[DeviceA-Bridge-Aggregation3] port m-lag peer-link 1

[DeviceA-Bridge-Aggregation3] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 4 and assign it to M-LAG group 4.

[DeviceA] interface bridge-aggregation 4

[DeviceA-Bridge-Aggregation4] link-aggregation mode dynamic

[DeviceA-Bridge-Aggregation4] port m-lag group 4

[DeviceA-Bridge-Aggregation4] quit

# Assign Twenty-FiveGigE 1/0/1 and Twenty-FiveGigE 1/0/2 to aggregation group 4.

[DeviceA] interface twenty-fivegige 1/0/1

[DeviceA-Twenty-FiveGigE1/0/1] port link-aggregation group 4

[DeviceA-Twenty-FiveGigE1/0/1] quit

[DeviceA] interface twenty-fivegige 1/0/2

[DeviceA-Twenty-FiveGigE1/0/2] port link-aggregation group 4

[DeviceA-Twenty-FiveGigE1/0/2] quit

# Set the link type of Bridge-Aggregation 4 to trunk and assign it to VLAN 10 and VLAN 20.

[DeviceA] interface bridge-aggregation 4

[DeviceA-Bridge-Aggregation4] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceA-Bridge-Aggregation4] port trunk permit vlan 10 20

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceA-Bridge-Aggregation4] quit

Configuring Device B

# Configure M-LAG system settings.

<DeviceB> system-view

[DeviceB] m-lag system-mac 1-1-1

Changing the system MAC might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

[DeviceB] m-lag system-number 2

Changing the system number might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

[DeviceB] m-lag system-priority 123

Changing the system priority might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

# Configure M-LAG keepalive packet parameters.

[DeviceB] m-lag keepalive ip destination 1.1.1.1 source 1.1.1.2

# Configure Twenty-FiveGigE 1/0/5 as a routed (Layer 3) interface and assign the interface an IP address. The IP address will be used as the source IP address of keepalive packets.

[DeviceB] interface twenty-fivegige 1/0/5

[DeviceB-Twenty-FiveGigE1/0/5] port link-mode route

[DeviceB-Twenty-FiveGigE1/0/5] ip address 1.1.1.2 24

[DeviceB-Twenty-FiveGigE1/0/5] quit

# Exclude the interface used for M-LAG keepalive detection (Twenty-FiveGigE 1/0/5) from the shutdown action by M-LAG MAD.

[DeviceB] m-lag mad exclude interface twenty-fivegige 1/0/5

# Create VLAN 10 and VLAN 20.

[DeviceB] vlan 10

[DeviceB-vlan10] quit

[DeviceB] vlan 20

[DeviceB-vlan20] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 2.

[DeviceB] interface bridge-aggregation 2

[DeviceB-Bridge-Aggregation2] link-aggregation mode dynamic

[DeviceB-Bridge-Aggregation2] quit

# Assign Twenty-FiveGigE 1/0/6 and Twenty-FiveGigE 1/0/7 to aggregation group 2.

[DeviceB] interface twenty-fivegige 1/0/6

[DeviceB-Twenty-FiveGigE1/0/6] port link-aggregation group 2

[DeviceB-Twenty-FiveGigE1/0/6] quit

[DeviceB] interface twenty-fivegige 1/0/7

[DeviceB-Twenty-FiveGigE1/0/7] port link-aggregation group 2

[DeviceB-Twenty-FiveGigE1/0/7] quit

# Set the link type of Bridge-Aggregation 2 to trunk and assign it to VLAN 10 and VLAN 20.

[DeviceB] interface bridge-aggregation 2

[DeviceB-Bridge-Aggregation2] port link-type trunk

Configuring Twenty-FiveGigE1/0/6 done.

Configuring Twenty-FiveGigE1/0/7 done.

[DeviceB-Bridge-Aggregation2] port trunk permit vlan 10 20

Configuring Twenty-FiveGigE1/0/6 done.

Configuring Twenty-FiveGigE1/0/7 done.

[DeviceB-Bridge-Aggregation2] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 3.

[DeviceB] interface bridge-aggregation 3

[DeviceB-Bridge-Aggregation3] link-aggregation mode dynamic

[DeviceB-Bridge-Aggregation3] quit

# Assign Twenty-FiveGigE 1/0/3 and Twenty-FiveGigE 1/0/4 to aggregation group 3.

[DeviceB] interface twenty-fivegige 1/0/3

[DeviceB-Twenty-FiveGigE1/0/3] port link-aggregation group 3

[DeviceB-Twenty-FiveGigE1/0/3] quit

[DeviceB] interface twenty-fivegige 1/0/4

[DeviceB-Twenty-FiveGigE1/0/4] port link-aggregation group 3

[DeviceB-Twenty-FiveGigE1/0/4] quit

# Specify Bridge-Aggregation 3 as the peer-link interface.

[DeviceB] interface bridge-aggregation 3

[DeviceB-Bridge-Aggregation3] port m-lag peer-link 1

[DeviceB-Bridge-Aggregation3] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 4 and assign it to M-LAG group 4.

[DeviceB] interface bridge-aggregation 4

[DeviceB-Bridge-Aggregation4] link-aggregation mode dynamic

[DeviceB-Bridge-Aggregation4] port m-lag group 4

[DeviceB-Bridge-Aggregation4] quit

# Assign Twenty-FiveGigE 1/0/1 and Twenty-FiveGigE 1/0/2 to aggregation group 4.

[DeviceB] interface twenty-fivegige 1/0/1

[DeviceB-Twenty-FiveGigE1/0/1] port link-aggregation group 4

[DeviceB-Twenty-FiveGigE1/0/1] quit

[DeviceB] interface twenty-fivegige 1/0/2

[DeviceB-Twenty-FiveGigE1/0/2] port link-aggregation group 4

[DeviceB-Twenty-FiveGigE1/0/2] quit

# Set the link type of Bridge-Aggregation 4 to trunk and assign it to VLAN 10 and VLAN 20.

[DeviceB] interface bridge-aggregation 4

[DeviceB-Bridge-Aggregation4] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceB-Bridge-Aggregation4] port trunk permit vlan 10 20

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceB-Bridge-Aggregation4] quit

Configuring Device C

# Create VLAN 10, VLAN 20, and VLAN 100.

<DeviceC> system-view

[DeviceC] vlan 10

[DeviceC-vlan10] quit

[DeviceC] vlan 20

[DeviceC-vlan20] quit

[DeviceC] vlan 100

# Assign Twenty-FiveGigE 1/0/3 to VLAN 100.

[DeviceC] vlan 100

[DeviceC-vlan100] port twenty-fivegige 1/0/3

[DeviceC-vlan100] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 1.

[DeviceC] interface bridge-aggregation 1

[DeviceC-Bridge-Aggregation1] link-aggregation mode dynamic

[DeviceC-Bridge-Aggregation1] quit

# Assign Twenty-FiveGigE 1/0/1 and Twenty-FiveGigE1/0/2 to aggregation group 1.

[DeviceC] interface range twenty-fivegige 1/0/1 to twenty-fivegige 1/0/2

[DeviceC-if-range] port link-aggregation group 1

[DeviceC-if-range] quit

# Set the link type of Bridge-Aggregation 1 to trunk and assign it to VLAN 10 and VLAN 20.

[DeviceC] interface bridge-aggregation 1

[DeviceC-Bridge-Aggregation1] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceC-Bridge-Aggregation1] port trunk permit vlan 10 20

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceC-Bridge-Aggregation1] quit

# Create uplink interface VLAN-interface 100 and assign it an IP address.

[DeviceC] interface vlan-interface 100

[DeviceC-Vlan-interface100] ip address 100.1.1.1 24

[DeviceC-Vlan-interface100] quit

# Create VLAN-interface 10 and VLAN-interface 20 and assign an IP address to each of them.

[DeviceC] interface vlan-interface 10

[DeviceC-vlan-interface10] ip address 10.1.1.1 24

[DeviceC-vlan-interface10] quit

[DeviceC] interface vlan-interface 20

[DeviceC-vlan-interface20] ip address 20.1.1.1 24

[DeviceC-vlan-interface20] quit

# Create VRRP group 1 on VLAN-interface 10 and set its virtual IP address to 10.1.1.100.

[DeviceC] interface vlan-interface 10

[DeviceC-Vlan-interface10] vrrp vrid 1 virtual-ip 10.1.1.100

# Set the priority of Device C to 200 for it to become the master in VRRP group 1.

[DeviceC-Vlan-interface10] vrrp vrid 1 priority 200

[DeviceC-Vlan-interface10] quit

# Create VRRP group 2 on VLAN-interface 20 and set its virtual IP address to 20.1.1.100.

[DeviceC] interface vlan-interface 20

[DeviceC-Vlan-interface20] vrrp vrid 2 virtual-ip 20.1.1.100

[DeviceC-vlan-interface20] quit

# Configure Device C to operate in preemptive mode in VRRP group 1. Set the preemption delay to 500 centiseconds to avoid frequent status switchover.

[DeviceC] interface vlan-interface 10

[DeviceC-Vlan-interface10] vrrp vrid 1 preempt-mode delay 500

[DeviceC-Vlan-interface10] quit

# Create track entry 1 to monitor the upstream link status of Twenty-FiveGigE 1/0/3.

[DeviceC] track 1 interface twenty-fivegige 1/0/3

# Configure Device C in VRRP group 1 to monitor track entry 1, and decrease its priority by 150 when the track entry transits to Negative.

[DeviceC] interface vlan-interface 10

[DeviceC-Vlan-interface10] vrrp vrid 1 track 1 priority reduced 150

[DeviceC-Vlan-interface10] quit

# Configure OSPF.

[DeviceC] ospf

[DeviceC-ospf-1] area 0

[DeviceC-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] network 100.1.1.0 0.0.0.255

[DeviceC-ospf-1-area-0.0.0.0] quit

[DeviceC-ospf-1] quit

Configuring Device D

# Create VLAN 10, VLAN 20, and VLAN 200.

<DeviceD> system-view

[DeviceD] vlan 10

[DeviceD-vlan10] quit

[DeviceD] vlan 20

[DeviceD-vlan20] quit

[DeviceD] vlan 200

# Assign Twenty-FiveGigE 1/0/3 to VLAN 200.

[DeviceD] vlan 200

[DeviceD-vlan200] port twenty-fivegige 1/0/3

[DeviceD-vlan200] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 2.

[DeviceD] interface bridge-aggregation 2

[DeviceD-Bridge-Aggregation2] link-aggregation mode dynamic

[DeviceD-Bridge-Aggregation2] quit

# Assign Twenty-FiveGigE 1/0/1 and Twenty-FiveGigE 1/0/2 to aggregation group 2.

[DeviceD] interface range twenty-fivegige 1/0/1 to twenty-fivegige 1/0/2

[DeviceD-if-range] port link-aggregation group 2

[DeviceD-if-range] quit

# Set the link type of Bridge-Aggregation 2 to trunk and assign it to VLAN 10 and VLAN 20.

[DeviceD] interface bridge-aggregation 2

[DeviceD-Bridge-Aggregation2] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceD-Bridge-Aggregation2] port trunk permit vlan 10 20

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceD-Bridge-Aggregation2] quit

# Create uplink interface VLAN-interface 200 and assign it an IP address.

[DeviceD] interface vlan-interface 200

[DeviceD-Vlan-interface200] ip address 200.1.1.1 24

[DeviceD-Vlan-interface200] quit

# Create VLAN-interface 10 and VLAN-interface 20 and assign an IP address to each of them.

[DeviceD] interface vlan-interface 10

[DeviceD-vlan-interface10] ip address 10.1.1.2 24

[DeviceD-vlan-interface10] quit

[DeviceD] interface vlan-interface 20

[DeviceD-vlan-interface20] ip address 20.1.1.2 24

[DeviceD-vlan-interface20] quit

# Create VRRP group 1 on VLAN-interface 10 and set its virtual IP address to 10.1.1.100.

[DeviceD] interface vlan-interface 10

[DeviceD-Vlan-interface10] vrrp vrid 1 virtual-ip 10.1.1.100

[DeviceD-vlan-interface10] quit

# Create VRRP group 2 on VLAN-interface 20 and set its virtual IP address to 20.1.1.100.

[DeviceD] interface vlan-interface 20

[DeviceD-Vlan-interface20] vrrp vrid 2 virtual-ip 20.1.1.100

# Set the priority of Device D to 200 for it to become the master in VRRP group 2.

[DeviceD-Vlan-interface20] vrrp vrid 2 priority 200

# Configure Device D to operate in preemptive mode in VRRP group 2. Set the preemption delay to 500 centiseconds to avoid frequent status switchover.

[DeviceD-Vlan-interface20] vrrp vrid 2 preempt-mode delay 500

[DeviceD-Vlan-interface20] quit

# Create track entry 2 to monitor the upstream link status of Twenty-FiveGigE 1/0/3.

[DeviceD] track 2 interface twenty-fivegige 1/0/3

# Configure Device D in VRRP group 2 to monitor track entry 2, and decrease its priority by 150 when the track entry transits to Negative.

[DeviceD] interface vlan-interface 20

[DeviceD-Vlan-interface20] vrrp vrid 2 track 2 priority reduced 150

[DeviceD-Vlan-interface20] quit

# Configure OSPF.

[DeviceD] ospf

[DeviceD-ospf-1] area 0

[DeviceD-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[DeviceD-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255

[DeviceD-ospf-1-area-0.0.0.0] network 200.1.1.0 0.0.0.255

[DeviceD-ospf-1-area-0.0.0.0] quit

[DeviceD-ospf-1] quit

Configuring Device E

# Create VLAN 100 and assign Twenty-FiveGigE 1/0/1 to the VLAN.

<DeviceE> system-view

[DeviceE] vlan 100

[DeviceE-vlan100] port twenty-fivegige 1/0/1

[DeviceE-vlan100] quit

# Create VLAN-interface 100 and assign it an IP address.

[DeviceE] interface vlan-interface 100

[DeviceE-vlan-interface100] ip address 100.1.1.2 24

[DeviceE-vlan-interface100] quit

# Create VLAN 200 and assign Twenty-FiveGigE 1/0/2 to the VLAN.

[DeviceE] vlan 200

[DeviceE-vlan200] port twenty-fivegige 1/0/2

[DeviceE-vlan200] quit

# Create VLAN-interface 200 and assign it an IP address.

[DeviceE] interface vlan-interface 200

[DeviceE-vlan-interface200] ip address 200.1.1.2 24

[DeviceE-vlan-interface200] quit

# Create VLAN 30 and assign Twenty-FiveGigE 1/0/3 to the VLAN.

[DeviceE] vlan 30

[DeviceE-vlan30] port twenty-fivegige 1/0/3

[DeviceE-vlan30] quit

# Create VLAN-interface 30 and assign it an IP address.

[DeviceE] interface vlan-interface 30

[DeviceE-vlan-interface30] ip address 30.1.1.1 24

[DeviceE-vlan-interface30] quit

# Configure OSPF.

[DeviceD] ospf

[DeviceD-ospf-1] area 0

[DeviceD-ospf-1-area-0.0.0.0] network 100.1.1.0 0.0.0.255

[DeviceD-ospf-1-area-0.0.0.0] network 200.1.1.0 0.0.0.255

[DeviceD-ospf-1-area-0.0.0.0] network 30.1.1.0 0.0.0.255

[DeviceD-ospf-1-area-0.0.0.0] quit

[DeviceD-ospf-1] quit

Configuring Device F

# Create VLAN 10 and VLAN 20.

[DeviceF] vlan 10

[DeviceF-vlan10] quit

[DeviceF] vlan 20

[DeviceF-vlan20] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 4.

[DeviceF] interface bridge-aggregation 4

[DeviceF-Bridge-Aggregation4] link-aggregation mode dynamic

[DeviceF-Bridge-Aggregation4] quit

# Assign Twenty-FiveGigE 1/0/1 through Twenty-FiveGigE 1/0/4 to aggregation group 4.

[DeviceF] interface range twenty-fivegige 1/0/1 to twenty-fivegige 1/0/4

[DeviceF-if-range] port link-aggregation group 4

[DeviceF-if-range] quit

# Set the link type of Bridge-Aggregation 4 to trunk and assign it to VLAN 10 and VLAN 20.

[DeviceF] interface bridge-aggregation 4

[DeviceF-Bridge-Aggregation4] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

Configuring Twenty-FiveGigE1/0/3 done.

Configuring Twenty-FiveGigE1/0/4 done.

[DeviceF-Bridge-Aggregation4] port trunk permit vlan 10 20

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

Configuring Twenty-FiveGigE1/0/3 done.

Configuring Twenty-FiveGigE1/0/4 done.

[DeviceF-Bridge-Aggregation4] quit

Verifying the configuration

# Verify that Device A and Device B have formed an M-LAG system.

[DeviceA] display m-lag summary

Flags: A -- Aggregate interface down, B -- No peer M-LAG interface configured

C -- Configuration consistency check failed

Peer-link interface: BAGG3

Peer-link interface state (cause): UP

Keepalive link state (cause): UP

M-LAG interface information

M-LAG IF M-LAG group Local state (cause) Peer state Remaining down time(s)

BAGG4 4 UP UP -

[DeviceA] display m-lag verbose

Flags: A -- Home_Gateway, B -- Neighbor_Gateway, C -- Other_Gateway,

D -- PeerLink_Activity, E -- DRCP_Timeout, F -- Gateway_Sync,

G -- Port_Sync, H -- Expired

Peer-link interface/Peer-link interface ID: BAGG3/1

State: UP

Cause: -

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): WGE1/0/3 (2), WGE1/0/4 (5)

Peer Selected ports indexes: 2, 5

M-LAG interface/M-LAG group ID: BAGG4/4

Local M-LAG interface state: UP

Peer M-LAG interface state: UP

M-LAG group state: UP

Local M-LAG interface down cause: -

Remaining M-LAG DOWN time: -

Local M-LAG interface LACP MAC: Config=0001-0001-0001, Effective=0001-0001-0001

Peer M-LAG interface LACP MAC: Config=0001-0001-0001, Effective=0001-0001-0001

Local M-LAG interface LACP priority: Config=200, Effective=200

Peer M-LAG interface LACP priority: Config=200, Effective=200

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): WGE1/0/1 (16385), WGE1/0/2 (16388)

Peer Selected ports indexes: 32769, 32772

# Verify that all member ports of aggregation group 4 are in Selected state on Device F, which indicates a successful link aggregation between the M-LAG system and Device F.

[DeviceF] display link-aggregation verbose

Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing

Port Status: S -- Selected, U -- Unselected, I -- Individual

Port: A -- Auto port, M -- Management port, R -- Reference port

Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,

D -- Synchronization, E -- Collecting, F -- Distributing,

G -- Defaulted, H -- Expired

Aggregate Interface: Bridge-Aggregation4

Creation Mode: Manual

Aggregation Mode: Dynamic

Loadsharing Type: Shar

Management VLANs: None

System ID: 0x8000, 1eba-3c46-0300

Local:

Port Status Priority Index Oper-Key Flag

WGE1/0/1 S 32768 1 1 {ACDEF}

WGE1/0/2 S 32768 2 1 {ACDEF}

WGE1/0/3 S 32768 3 1 {ACDEF}

WGE1/0/4 S 32768 4 1 {ACDEF}

Remote:

Actor Priority Index Oper-Key SystemID Flag

WGE1/0/1(R) 32768 16385 40004 0x7b , 0001-0001-0001 {ACDEF}

WGE1/0/2 32768 16388 40004 0x7b , 0001-0001-0001 {ACDEF}

WGE1/0/3 32768 32769 40004 0x7b , 0001-0001-0001 {ACDEF}

WGE1/0/4 32768 32772 40004 0x7b , 0001-0001-0001 {ACDEF}

# Verify that Device C is the master in VRRP group 1 and Device D is the master in VRRP group 2.

[DeviceC] display vrrp

IPv4 Virtual Router Information:

Running mode : Standard

Total number of virtual routers : 2

Interface VRID State Running Adver Auth Virtual

Pri Timer Type IP

---------------------------------------------------------------------

Vlan10 1 Master 200 100 None 10.1.1.100

Vlan20 2 Backup 100 100 None 20.1.1.100

[DeviceD] display vrrp

IPv4 Virtual Router Information:

Running mode : Standard

Total number of virtual routers : 2

Interface VRID State Running Adver Auth Virtual

Pri Timer Type IP

---------------------------------------------------------------------

Vlan10 1 Backup 100 100 None 10.1.1.100

Vlan20 2 Master 200 100 None 20.1.1.100

# Verify that Device E has established OSPF neighbor relationships with Device C and Device D.

[DeviceE] display ospf peer

OSPF Process 1 with Router ID 200.1.1.2

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

100.1.1.1 100.1.1.1 1 35 Full/BDR Vlan100

200.1.1.1 200.1.1.1 1 33 Full/BDR Vlan200

# Verify that the host in Area A can ping VLAN-interface 30 (30.1.1.1) on Device E.

C:\Documents and Settings\Administrator>ping 30.1.1.1

Pinging 30.1.1.1 with 32 bytes of data:

Reply from 30.1.1.1: bytes=32 time=1ms TTL=126

Ping statistics for 30.1.1.1:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 1ms, Average = 1ms

Configuration files

· Device A:

vlan 10

vlan 20

interface Bridge-Aggregation1

port link-type trunk

port trunk permit vlan 1 10 20

link-aggregation mode dynamic

interface Bridge-Aggregation3

port link-type trunk

port trunk permit vlan all

link-aggregation mode dynamic

port m-lag peer-link 1

interface Bridge-Aggregation4

port link-type trunk

port trunk permit vlan 1 10 20

link-aggregation mode dynamic

port m-lag group 4

interface Twenty-FiveGigE1/0/5

port link-mode route

ip address 1.1.1.1 255.255.255.0

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 4

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 4

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port link-type trunk

port trunk permit vlan all

port link-aggregation group 3

interface Twenty-FiveGigE1/0/4

port link-mode bridge

port link-type trunk

port trunk permit vlan all

port link-aggregation group 3

interface Twenty-FiveGigE1/0/6

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 1

interface Twenty-FiveGigE1/0/7

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 1

m-lag system-mac 0001-0001-0001

m-lag system-number 1

m-lag system-priority 123

m-lag keepalive ip destination 1.1.1.2 source 1.1.1.1

m-lag mad exclude interface Twenty-FiveGigE1/0/5

· Device B:

vlan 10

vlan 20

interface Bridge-Aggregation2

port link-type trunk

port trunk permit vlan 1 10 20

link-aggregation mode dynamic

interface Bridge-Aggregation3

port link-type trunk

port trunk permit vlan all

link-aggregation mode dynamic

port m-lag peer-link 1

interface Bridge-Aggregation4

port link-type trunk

port trunk permit vlan 1 10 20

link-aggregation mode dynamic

port m-lag group 4

interface Twenty-FiveGigE1/0/5

port link-mode route

ip address 1.1.1.2 255.255.255.0

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 4

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 4

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port link-type trunk

port trunk permit vlan all

port link-aggregation group 3

interface Twenty-FiveGigE1/0/4

port link-mode bridge

port link-type trunk

port trunk permit vlan all

port link-aggregation group 3

interface Twenty-FiveGigE1/0/6

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 2

interface Twenty-FiveGigE1/0/7

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 2

m-lag system-mac 0001-0001-0001

m-lag system-number 2

m-lag system-priority 123

m-lag keepalive ip destination 1.1.1.1 source 1.1.1.2

m-lag mad exclude interface Twenty-FiveGigE1/0/5

· Device C:

ospf 1

area 0.0.0.0

network 10.1.1.0 0.0.0.255

network 20.1.1.0 0.0.0.255

network 100.1.1.0 0.0.0.255

vlan 10

vlan 20

vlan 100

interface Bridge-Aggregation1

port link-type trunk

port trunk permit vlan 1 10 20

link-aggregation mode dynamic

interface Vlan-interface10

ip address 10.1.1.1 255.255.255.0

vrrp vrid 1 virtual-ip 10.1.1.100

vrrp vrid 1 priority 200

vrrp vrid 1 preempt-mode delay 500

vrrp vrid 1 track 1 priority reduced 150

interface Vlan-interface20

ip address 20.1.1.1 255.255.255.0

vrrp vrid 2 virtual-ip 20.1.1.100

interface Vlan-interface100

ip address 100.1.1.1 255.255.255.0

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 1

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 1

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port access vlan 100

track 1 interface Twenty-FiveGigE1/0/3

· Device D:

ospf 1

area 0.0.0.0

network 10.1.1.0 0.0.0.255

network 20.1.1.0 0.0.0.255

network 200.1.1.0 0.0.0.255

vlan 10

vlan 20

vlan 200

interface Bridge-Aggregation2

port link-type trunk

port trunk permit vlan 1 10 20

link-aggregation mode dynamic

interface Vlan-interface10

ip address 10.1.1.2 255.255.255.0

vrrp vrid 1 virtual-ip 10.1.1.100

interface Vlan-interface20

ip address 20.1.1.2 255.255.255.0

vrrp vrid 2 virtual-ip 20.1.1.100

vrrp vrid 2 priority 200

vrrp vrid 2 preempt-mode delay 500

vrrp vrid 2 track 2 priority reduced 150

interface Vlan-interface200

ip address 200.1.1.1 255.255.255.0

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 2

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 2

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port access vlan 200

track 2 interface Twenty-FiveGigE1/0/3

· Device E:

ospf 1

area 0.0.0.0

network 30.1.1.0 0.0.0.255

network 100.1.1.0 0.0.0.255

network 200.1.1.0 0.0.0.255

vlan 30

vlan 100

vlan 200

interface Vlan-interface30

ip address 30.1.1.1 255.255.255.0

interface Vlan-interface100

ip address 100.1.1.2 255.255.255.0

interface Vlan-interface200

ip address 200.1.1.2 255.255.255.0

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port access vlan 100

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port access vlan 200

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port access vlan 30

· Device F:

vlan 10

vlan 20

interface Bridge-Aggregation4

port link-type trunk

port trunk permit vlan 1 10 20

link-aggregation mode dynamic

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 4

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 4

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 4

interface Twenty-FiveGigE1/0/4

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 10 20

port link-aggregation group 4

Example: Configuring M-LAG at the distribution Layer

Network configuration

As shown in Figure 2:

· Configure Device A and Device B as an M-LAG system to establish one multichassis aggregate link with Device C and Device D.

· Set up a keepalive link between Twenty-FiveGigE 1/0/5 of Device A and Twenty-FiveGigE 1/0/5 of Device B, and exclude the interfaces from the shutdown action by M-LAG MAD.

· Configure two VRRP groups on Device A and Device B to provide gateway services for VLAN 100 and VLAN 101.

¡ Configure VRRP group 1 to provide gateway services for hosts in VLAN 100 (Area A). Add Device A and Device B to the group as the master and backup devices, respectively.

¡ Configure VRRP group 2 to provide gateway services for hosts in VLAN 101 (Area B). Add Device B and Device A to the group as the master and backup devices, respectively.

· Configure OSPF on Device A, Device B, and Device E for the hosts to communicate with external networks at Layer 3.

Figure 2 Network diagram

Device	Interface	IP address	Device	Interface	IP address
Device A	WGE 1/0/5	1.1.1.1/24	Device B	WGE 1/0/5	1.1.1.2/24
	VLAN-interface 100	100.1.1.1/24		VLAN-interface 100	100.1.1.2/24
	VLAN-interface 101	101.1.1.1/24		VLAN-interface 101	101.1.1.2/24
	VLAN-interface 10	10.1.1.1/24		VLAN-interface 20	20.1.1.1/24
	Virtual IP 1	100.1.1.100/24		Virtual IP 1	100.1.1.100/24
	Virtual IP 2	101.1.1.100/24		Virtual IP 2	101.1.1.100/24
Device E	VLAN-interface 10	10.1.1.2/24
	VLAN-interface 20	20.1.1.2/24
	VLAN-interface 30	30.1.1.1/24

Analysis

For the secondary M-LAG device to monitor the state of the primary device, establish a Layer 3 keepalive link between the M-LAG member devices.

For Device A to be the master in VRRP group 1, assign it a higher priority than Device B. For Device B to be the master in VRRP group 2, assign it a higher priority than Device A.

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6550X-HI series	Release 1213P51 and later
S6880 series	Release 1213P51 and later
S9820-8M	Release 1213P51 and later
S5580X-HI series	Release 1213P50 and later
S5580X-EI series	Release 1213P50 and later
S5580S-EI series	Release 1213P50 and later

Restrictions and guidelines

M-LAG restrictions and guidelines

To balance traffic between two VRRP gateway devices, you can assign them to two VRRP groups with different priorities. In this example, Device A is assigned a higher priority than Device B in VRRP group 1 so Device A can become the master in this group. Device B is assigned a higher priority than Device A in VRRP group 2 so Device B can become the master in this group.

An M-LAG member device can have only one peer link.

For correct keepalive detection, you must exclude the interfaces used for keepalive detection from the shutdown action by M-LAG MAD.

VRRP restrictions and guidelines

You cannot specify the virtual IP address as any of the following IP addresses:

· All-zero address (0.0.0.0).

· Broadcast address (255.255.255.255).

· Loopback address.

· IP address of other than Class A, Class B, and Class C.

· Invalid IP address (for example, 0.0.0.1).

The virtual IP address of an IPv4 VRRP group must be on the same subnet as the downlink interface IP addresses of the VRRP group members to ensure successful traffic forwarding.

Procedures

Configuring Device A

# Configure M-LAG system settings.

<DeviceA> system-view

[DeviceA] m-lag system-mac 1-1-1

Changing the system MAC might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

[DeviceA] m-lag system-number 1

Changing the system number might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

[DeviceA] m-lag system-priority 123

Changing the system priority might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

# Configure M-LAG keepalive packet parameters.

[DeviceA] m-lag keepalive ip destination 1.1.1.2 source 1.1.1.1

# Configure Twenty-FiveGigE 1/0/5 as a routed (Layer 3) interface and assign the interface an IP address. The IP address will be used as the source IP address of keepalive packets.

[DeviceA] interface twenty-fivegige 1/0/5

[DeviceA-Twenty-FiveGigE1/0/5] port link-mode route

[DeviceA-Twenty-FiveGigE1/0/5] ip address 1.1.1.1 24

[DeviceA-Twenty-FiveGigE1/0/5] quit

# Exclude the interface used for M-LAG keepalive detection (Twenty-FiveGigE 1/0/5) from the shutdown action by M-LAG MAD.

[DeviceA] m-lag mad exclude interface twenty-fivegige 1/0/5

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 125.

[DeviceA] interface bridge-aggregation 125

[DeviceA-Bridge-Aggregation125] link-aggregation mode dynamic

[DeviceA-Bridge-Aggregation125] quit

# Assign Twenty-FiveGigE 1/0/3 and Twenty-FiveGigE 1/0/4 to aggregation group 125.

[DeviceA] interface twenty-fivegige 1/0/3

[DeviceA-Twenty-FiveGigE1/0/3] port link-aggregation group 125

[DeviceA-Twenty-FiveGigE1/0/3] quit

[DeviceA] interface twenty-fivegige 1/0/4

[DeviceA-Twenty-FiveGigE1/0/4] port link-aggregation group 125

[DeviceA-Twenty-FiveGigE1/0/4] quit

# Specify Bridge-Aggregation 125 as the peer-link interface.

[DeviceA] interface bridge-aggregation 125

[DeviceA-Bridge-Aggregation125] port m-lag peer-link 1

[DeviceA-Bridge-Aggregation125] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 100 and assign it to M-LAG group 1.

[DeviceA] interface bridge-aggregation 100

[DeviceA-Bridge-Aggregation100] link-aggregation mode dynamic

[DeviceA-Bridge-Aggregation100] port m-lag group 1

[DeviceA-Bridge-Aggregation100] quit

# Assign Twenty-FiveGigE 1/0/1 to aggregation group 100.

[DeviceA] interface twenty-fivegige 1/0/1

[DeviceA-Twenty-FiveGigE1/0/1] port link-aggregation group 100

[DeviceA-Twenty-FiveGigE1/0/1] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 101 and assign it to M-LAG group 2.

[DeviceA] interface bridge-aggregation 101

[DeviceA-Bridge-Aggregation101] link-aggregation mode dynamic

[DeviceA-Bridge-Aggregation101] port m-lag group 2

[DeviceA-Bridge-Aggregation101] quit

# Assign Twenty-FiveGigE 1/0/2 to aggregation group 101.

[DeviceA] interface twenty-fivegige 1/0/2

[DeviceA-Twenty-FiveGigE1/0/2] port link-aggregation group 101

[DeviceA-Twenty-FiveGigE1/0/2] quit

# Create VLAN 10, VLAN 100, and VLAN 101.

[DeviceA] vlan 10

[DeviceA-vlan10] quit

[DeviceA] vlan 100

[DeviceA-vlan100] quit

[DeviceA] vlan 101

[DeviceA-vlan101] quit

# Assign Twenty-FiveGigE 1/0/6 to VLAN 10.

[DeviceA] vlan 10

[DeviceA-vlan10] port twenty-fivegige 1/0/6

[DeviceA-vlan10] quit

# Set the link type of Bridge-Aggregation 100 to trunk and assign it to VLAN 100.

[DeviceA] interface bridge-aggregation 100

[DeviceA-Bridge-Aggregation100] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

[DeviceA-Bridge-Aggregation100] port trunk permit vlan 100

Configuring Twenty-FiveGigE1/0/1 done.

[DeviceA-Bridge-Aggregation100] quit

# Set the link type of Bridge-Aggregation 101 to trunk and assign it to VLAN 101.

[DeviceA] interface bridge-aggregation 101

[DeviceA-Bridge-Aggregation101] port link-type trunk

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceA-Bridge-Aggregation101] port trunk permit vlan 101

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceA-Bridge-Aggregation101] quit

# Create VLAN-interface 10, VLAN-interface 100, and VLAN-interface 101 and assign an IP address to each of them.

[DeviceA] interface vlan-interface 10

[DeviceA-vlan-interface10] ip address 10.1.1.1 24

[DeviceA-vlan-interface10] quit

[DeviceA] interface vlan-interface 100

[DeviceA-vlan-interface100] ip address 100.1.1.1 24

[DeviceA-vlan-interface100] quit

[DeviceA] interface vlan-interface 101

[DeviceA-vlan-interface101] ip address 101.1.1.1 24

[DeviceA-vlan-interface101] quit

# Configure OSPF.

[DeviceA] ospf

[DeviceA-ospf-1] area 0

[DeviceA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[DeviceA-ospf-1-area-0.0.0.0] network 100.1.1.0 0.0.0.255

[DeviceA-ospf-1-area-0.0.0.0] network 101.1.1.0 0.0.0.255

[DeviceA-ospf-1-area-0.0.0.0] quit

[DeviceA-ospf-1] quit

# Create VRRP group 1 on VLAN-interface 100 and set its virtual IP address to 100.1.1.100.

[DeviceA] interface vlan-interface 100

[DeviceA-Vlan-interface100] vrrp vrid 1 virtual-ip 100.1.1.100

# Set the priority of Device A to 200 for it to become the master in VRRP group 1.

[DeviceA-Vlan-interface100] vrrp vrid 1 priority 200

[DeviceA-Vlan-interface100] quit

# Create VRRP group 2 on VLAN-interface 101 and set its virtual IP address to 101.1.1.100.

[DeviceA] interface vlan-interface 101

[DeviceA-Vlan-interface101] vrrp vrid 2 virtual-ip 101.1.1.100

[DeviceA-Vlan-interface101] quit

# Configure Device A to operate in preemptive mode in VRRP group 1. Set the preemption delay to 500 centiseconds to avoid frequent status switchover.

[DeviceA] interface vlan-interface 100

[DeviceA-Vlan-interface100] vrrp vrid 1 preempt-mode delay 500

[DeviceA-Vlan-interface100] quit

# Create track entry 1 to monitor the upstream link status of Twenty-FiveGigE 1/0/6.

[DeviceA] track 1 interface twenty-fivegige 1/0/6

# Configure Device A in VRRP group 1 to monitor track entry 1, and decrease its priority by 150 when the track entry transits to Negative.

[DeviceA] interface vlan-interface 100

[DeviceA-Vlan-interface100] vrrp vrid 1 track 1 priority reduced 150

[DeviceA-Vlan-interface100] quit

Configuring Device B

# Configure M-LAG system settings.

<DeviceB> system-view

[DeviceB] m-lag system-mac 1-1-1

Changing the system MAC might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

[DeviceB] m-lag system-number 2

Changing the system number might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

[DeviceB] m-lag system-priority 123

Changing the system priority might flap the intra-portal link and cause M-LAG system setup failure. Continue? [Y/N]:y

# Configure M-LAG keepalive packet parameters.

[DeviceB] m-lag keepalive ip destination 1.1.1.1 source 1.1.1.2

# Configure Twenty-FiveGigE 1/0/5 as a routed (Layer 3) interface and assign the interface an IP address. The IP address will be used as the source IP address of keepalive packets.

[DeviceB] interface twenty-fivegige 1/0/5

[DeviceB-Twenty-FiveGigE1/0/5] port link-mode route

[DeviceB-Twenty-FiveGigE1/0/5] ip address 1.1.1.2 24

[DeviceB-Twenty-FiveGigE1/0/5] quit

# Exclude the interface used for M-LAG keepalive detection (Twenty-FiveGigE 1/0/5) from the shutdown action by M-LAG MAD.

[DeviceB] m-lag mad exclude interface twenty-fivegige 1/0/5

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 125.

[DeviceB] interface bridge-aggregation 125

[DeviceB-Bridge-Aggregation125] link-aggregation mode dynamic

[DeviceB-Bridge-Aggregation125] quit

# Assign Twenty-FiveGigE 1/0/3 and Twenty-FiveGigE 1/0/4 to aggregation group 125.

[DeviceB] interface twenty-fivegige 1/0/3

[DeviceB-Twenty-FiveGigE1/0/3] port link-aggregation group 125

[DeviceB-Twenty-FiveGigE1/0/3] quit

[DeviceB] interface twenty-fivegige 1/0/4

[DeviceB-Twenty-FiveGigE1/0/4] port link-aggregation group 125

[DeviceB-Twenty-FiveGigE1/0/4] quit

# Specify Bridge-Aggregation 125 as the peer-link interface.

[DeviceB] interface bridge-aggregation 125

[DeviceB-Bridge-Aggregation125] port m-lag peer-link 1

[DeviceB-Bridge-Aggregation125] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 100 and assign it to M-LAG group 1.

[DeviceB] interface bridge-aggregation 100

[DeviceB-Bridge-Aggregation100] link-aggregation mode dynamic

[DeviceB-Bridge-Aggregation100] port m-lag group 1

[DeviceB-Bridge-Aggregation100] quit

# Assign Twenty-FiveGigE 1/0/2 to aggregation group 100.

[DeviceB] interface twenty-fivegige 1/0/2

[DeviceB-Twenty-FiveGigE1/0/2] port link-aggregation group 100

[DeviceB-Twenty-FiveGigE1/0/2] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 101 and assign it to M-LAG group 2.

[DeviceB] interface bridge-aggregation 101

[DeviceB-Bridge-Aggregation101] link-aggregation mode dynamic

[DeviceB-Bridge-Aggregation101] port m-lag group 2

[DeviceB-Bridge-Aggregation101] quit

# Assign Twenty-FiveGigE 1/0/1 to aggregation group 101.

[DeviceB] interface twenty-fivegige 1/0/1

[DeviceB-Twenty-FiveGigE1/0/1] port link-aggregation group 101

[DeviceB-Twenty-FiveGigE1/0/1] quit

# Create VLAN 20, VLAN 100, and VLAN 101.

[DeviceB] vlan 20

[DeviceB-vlan20] quit

[DeviceB] vlan 100

[DeviceB-vlan100] quit

[DeviceB] vlan 101

[DeviceB-vlan101] quit

# Assign Twenty-FiveGigE 1/0/6 to VLAN 20.

[DeviceB] vlan 20

[DeviceB-vlan20] port twenty-fivegige 1/0/6

[DeviceB-vlan20] quit

# Set the link type of Bridge-Aggregation 100 to trunk and assign it to VLAN 100.

[DeviceB] interface bridge-aggregation 100

[DeviceB-Bridge-Aggregation100] port link-type trunk

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceB-Bridge-Aggregation100] port trunk permit vlan 100

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceB-Bridge-Aggregation100] quit

# Set the link type of Bridge-Aggregation 101 to trunk and assign it to VLAN 101.

[DeviceB] interface bridge-aggregation 101

[DeviceB-Bridge-Aggregation101] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

[DeviceB-Bridge-Aggregation101] port trunk permit vlan 101

Configuring Twenty-FiveGigE1/0/1 done.

[DeviceB-Bridge-Aggregation101] quit

# Create VLAN-interface 20, VLAN-interface 100, and VLAN-interface 101 and assign an IP address to each of them.

[DeviceB] interface vlan-interface 20

[DeviceB-vlan-interface20] ip address 20.1.1.1 24

[DeviceB-vlan-interface20] quit

[DeviceB] interface vlan-interface 100

[DeviceB-vlan-interface100] ip address 100.1.1.2 24

[DeviceB-vlan-interface100] quit

[DeviceB] interface vlan-interface 101

[DeviceB-vlan-interface101] ip address 101.1.1.2 24

[DeviceB-vlan-interface101] quit

# Configure OSPF.

[DeviceB] ospf

[DeviceB-ospf-1] area 0

[DeviceB-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255

[DeviceB-ospf-1-area-0.0.0.0] network 100.1.1.0 0.0.0.255

[DeviceB-ospf-1-area-0.0.0.0] network 101.1.1.0 0.0.0.255

[DeviceB-ospf-1-area-0.0.0.0] quit

[DeviceB-ospf-1] quit

# Create VRRP group 1 on VLAN-interface 100 and set its virtual IP address to 100.1.1.100.

[DeviceB] interface vlan-interface 100

[DeviceB-Vlan-interface100] vrrp vrid 1 virtual-ip 100.1.1.100

[DeviceB-Vlan-interface100] quit

# Create VRRP group 2 on VLAN-interface 101 and set its virtual IP address to 101.1.1.100.

[DeviceB] interface vlan-interface 101

[DeviceB-Vlan-interface101] vrrp vrid 2 virtual-ip 101.1.1.100

# Set the priority of Device B to 200 for it to become the master in VRRP group 2.

[DeviceB-Vlan-interface101] vrrp vrid 2 priority 200

# Configure Device B to operate in preemptive mode in VRRP group 2. Set the preemption delay to 500 centiseconds to avoid frequent status switchover.

[DeviceB-Vlan-interface101] vrrp vrid 2 preempt-mode delay 500

[DeviceB-Vlan-interface101] quit

# Create track entry 2 to monitor the upstream link status of Twenty-FiveGigE 1/0/6.

[DeviceB] track 2 interface twenty-fivegige 1/0/6

# Configure Device B in VRRP group 2 to monitor track entry 2, and decrease its priority by 150 when the track entry transits to Negative.

[DeviceB] interface vlan-interface 101

[DeviceB-Vlan-interface101] vrrp vrid 2 track 2 priority reduced 150

[DeviceB-Vlan-interface101] quit

Configuring Device C

# Create VLAN 100.

[DeviceC] vlan 100

[DeviceC-vlan100] quit

# Assign Twenty-FiveGigE 1/0/3 to VLAN 100.

[DeviceC] interface twenty-fivegige 1/0/3

[DeviceC-Twenty-FiveGigE1/0/3] port access vlan 100

[DeviceC-Twenty-FiveGigE1/0/3] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 100.

<DeviceC> system-view

[DeviceC] interface bridge-aggregation 100

[DeviceC-Bridge-Aggregation100] link-aggregation mode dynamic

[DeviceC-Bridge-Aggregation100] quit

# Assign Twenty-FiveGigE 1/0/1 and Twenty-FiveGigE 1/0/2 to aggregation group 100.

[DeviceC] interface range twenty-fivegige 1/0/1 to twenty-fivegige 1/0/2

[DeviceC-if-range] port link-aggregation group 100

[DeviceC-if-range] quit

# Set the link type of Bridge-Aggregation 100 to trunk and assign it to VLAN 100.

[DeviceC] interface bridge-aggregation 100

[DeviceC-Bridge-Aggregation100] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceC-Bridge-Aggregation100] port trunk permit vlan 100

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceC-Bridge-Aggregation100] quit

Configuring Device D

# Create VLAN 101.

[DeviceD] vlan 101

[DeviceD-vlan101] quit

# Assign Twenty-FiveGigE 1/0/3 to VLAN 101.

[DeviceD] interface twenty-fivegige 1/0/3

[DeviceD-Twenty-FiveGigE1/0/3] port access vlan 101

[DeviceD-Twenty-FiveGigE1/0/3] quit

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 101.

<DeviceD> system-view

[DeviceD] interface bridge-aggregation 101

[DeviceD-Bridge-Aggregation101] link-aggregation mode dynamic

[DeviceD-Bridge-Aggregation101] quit

# Assign Twenty-FiveGigE 1/0/1 and Twenty-FiveGigE 1/0/2 to aggregation group 101.

[DeviceD] interface range twenty-fivegige 1/0/1 to twenty-fivegige 1/0/2

[DeviceD-if-range] port link-aggregation group 101

[DeviceD-if-range] quit

# Set the link type of Bridge-Aggregation 101 to trunk and assign it to VLAN 101.

[DeviceD] interface bridge-aggregation 101

[DeviceD-Bridge-Aggregation101] port link-type trunk

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceD-Bridge-Aggregation101] port trunk permit vlan 101

Configuring Twenty-FiveGigE1/0/1 done.

Configuring Twenty-FiveGigE1/0/2 done.

[DeviceD-Bridge-Aggregation101] quit

Configuring Device E

# Create VLAN 10 and assign Twenty-FiveGigE 1/0/1 to the VLAN.

<DeviceE> system-view

[DeviceE] vlan 10

[DeviceE-vlan10] port twenty-fivegige 1/0/1

[DeviceE-vlan10] quit

# Create VLAN-interface 10 and assign it an IP address.

[DeviceE] interface vlan-interface 10

[DeviceE-vlan-interface10] ip address 10.1.1.2 24

[DeviceE-vlan-interface10] quit

# Create VLAN 20 and assign Twenty-FiveGigE 1/0/2 to the VLAN.

[DeviceE] vlan 20

[DeviceE-vlan20] port twenty-fivegige 1/0/2

[DeviceE-vlan20] quit

# Create VLAN-interface 20 and assign it an IP address.

[DeviceE] interface vlan-interface 20

[DeviceE-vlan-interface20] ip address 20.1.1.2 24

[DeviceE-vlan-interface20] quit

# Create VLAN 30 and assign Twenty-FiveGigE 1/0/3 to the VLAN.

[DeviceE] vlan 30

[DeviceE-vlan30] port twenty-fivegige 1/0/3

[DeviceE-vlan30] quit

# Create VLAN-interface 30 and assign it an IP address.

[DeviceE] interface vlan-interface 30

[DeviceE-vlan-interface30] ip address 30.1.1.1 24

[DeviceE-vlan-interface30] quit

# Configure OSPF.

[DeviceE] ospf

[DeviceE-ospf-1] area 0

[DeviceE-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[DeviceE-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255

[DeviceE-ospf-1-area-0.0.0.0] network 30.1.1.0 0.0.0.255

[DeviceE-ospf-1-area-0.0.0.0] quit

[DeviceE-ospf-1] quit

Verifying the configuration

# Verify that Device A and Device B have formed an M-LAG system.

[DeviceA] display m-lag summary

Flags: A -- Aggregate interface down, B -- No peer M-LAG interface configured

C -- Configuration consistency check failed

Peer-link interface: BAGG125

Peer-link interface state (cause): UP

Keepalive link state (cause): UP

M-LAG interface information

M-LAG IF M-LAG group Local state (cause) Peer state Remaining down time(s)

BAGG100 1 UP UP -

BAGG101 2 UP UP -

[DeviceA] display m-lag verbose

Flags: A -- Home_Gateway, B -- Neighbor_Gateway, C -- Other_Gateway,

D -- PeerLink_Activity, E -- DRCP_Timeout, F -- Gateway_Sync,

G -- Port_Sync, H -- Expired

Peer-link interface/Peer-link interface ID: BAGG125/1

State: UP

Cause: -

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): WGE1/0/3 (1), WGE1/0/4 (4)

Peer Selected ports indexes: 1, 4

M-LAG interface/M-LAG group ID: BAGG100/1

Local M-LAG interface state: UP

Peer M-LAG interface state: UP

M-LAG group state: UP

Local M-LAG interface down cause: -

Remaining M-LAG DOWN time: -

Local M-LAG interface LACP MAC: Config=0001-0001-0001, Effective=0001-0001-0001

Peer M-LAG interface LACP MAC: Config=0001-0001-0001, Effective=0001-0001-0001

Local M-LAG interface LACP priority: Config=32768, Effective=123

Peer M-LAG interface LACP priority: Config=32768, Effective=123

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

M-LAG interface/M-LAG group ID: BAGG101/2

Local M-LAG interface state: UP

Peer M-LAG interface state: UP

M-LAG group state: UP

Local M-LAG interface down cause: -

Remaining M-LAG DOWN time: -

Local M-LAG interface LACP MAC: Config=0001-0001-0001, Effective=0001-0001-0001

Peer M-LAG interface LACP MAC: Config=0001-0001-0001, Effective=0001-0001-0001

Local M-LAG interface LACP priority: Config=32768, Effective=123

Peer M-LAG interface LACP priority: Config=32768, Effective=123

Local DRCP flags/Peer DRCP flags: ABDFG/ABDFG

Local Selected ports (index): WGE1/0/2 (16387)

Peer Selected ports indexes: 32772

# Verify that all member ports of aggregation group 100 are in Selected state on Device C, which indicates a successful link aggregation between the M-LAG system and Device C.

[DeviceC] display link-aggregation verbose

Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing

Port Status: S -- Selected, U -- Unselected, I -- Individual

Port: A -- Auto port, M -- Management port, R -- Reference port

Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,

D -- Synchronization, E -- Collecting, F -- Distributing,

G -- Defaulted, H -- Expired

Aggregate Interface: Bridge-Aggregation100

Creation Mode: Manual

Aggregation Mode: Dynamic

Loadsharing Type: Shar

Management VLANs: None

System ID: 0x8000, 8e33-8e4a-0300

Local:

Port Status Priority Index Oper-Key Flag

WGE1/0/1 S 32768 1 1 {ACDEF}

WGE1/0/2 S 32768 2 1 {ACDEF}

Remote:

Actor Priority Index Oper-Key SystemID Flag

WGE1/0/1(R) 32768 16386 40001 0x7b , 0001-0001-0001 {ACDEF}

WGE1/0/2 32768 32770 40001 0x7b , 0001-0001-0001 {ACDEF}

# Verify that all member ports of aggregation group 101 are in Selected state on Device D, which indicates a successful link aggregation between the M-LAG system and Device D.

[DeviceD] display link-aggregation verbose

Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing

Port Status: S -- Selected, U -- Unselected, I -- Individual

Port: A -- Auto port, M -- Management port, R -- Reference port

Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,

D -- Synchronization, E -- Collecting, F -- Distributing,

G -- Defaulted, H -- Expired

Aggregate Interface: Bridge-Aggregation101

Creation Mode: Manual

Aggregation Mode: Dynamic

Loadsharing Type: Shar

Management VLANs: None

System ID: 0x8000, 8e33-9400-0400

Local:

Port Status Priority Index Oper-Key Flag

WGE1/0/1 S 32768 1 1 {ACDEF}

WGE1/0/2 S 32768 2 1 {ACDEF}

Remote:

Actor Priority Index Oper-Key SystemID Flag

WGE1/0/1(R) 32768 16387 40002 0x7b , 0001-0001-0001 {ACDEF}

WGE1/0/2 32768 32771 40002 0x7b , 0001-0001-0001 {ACDEF}

# Verify that Device A is the master in VRRP group 1 and Device B is the master in VRRP group 2.

[DeviceA] display vrrp

IPv4 Virtual Router Information:

Running mode : Standard

Total number of virtual routers : 2

Interface VRID State Running Adver Auth Virtual

Pri Timer Type IP

---------------------------------------------------------------------

Vlan100 1 Master 200 100 None 100.1.1.100

Vlan101 2 Backup 100 100 None 101.1.1.100

[DeviceB] display vrrp

IPv4 Virtual Router Information:

Running mode : Standard

Total number of virtual routers : 2

Interface VRID State Running Adver Auth Virtual

Pri Timer Type IP

---------------------------------------------------------------------

Vlan100 1 Backup 100 100 None 100.1.1.100

Vlan101 2 Master 200 100 None 101.1.1.100

# Verify that Device E has established OSPF neighbor relationships with Device A and Device B.

[DeviceE] display ospf peer

OSPF Process 1 with Router ID 30.1.1.1

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

101.1.1.1 10.1.1.1 1 34 Full/DR Vlan10

101.1.1.2 20.1.1.1 1 36 Full/DR Vlan20

# Verify that a host in Area A can ping the host at 101.1.1.4 in Area B.

C:\Documents and Settings\Administrator>ping 101.1.1.4

Pinging 101.1.1.4 with 32 bytes of data:

Reply from 101.1.1.4: bytes=32 time=1ms TTL=126

Ping statistics for 101.1.1.4:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 1ms, Average = 1ms

# Verify that a host in Area A can ping VLAN-interface 30 (30.1.1.1) on Device E.

C:\Documents and Settings\Administrator>ping 30.1.1.1

Pinging 30.1.1.1 with 32 bytes of data:

Reply from 30.1.1.1: bytes=32 time=1ms TTL=126

Ping statistics for 30.1.1.1:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 1ms, Average = 1ms

Configuration files

· Device A:

ospf 1

area 0.0.0.0

network 10.1.1.0 0.0.0.255

network 100.1.1.0 0.0.0.255

network 101.1.1.0 0.0.0.255

vlan 10

vlan 100 to 101

interface Bridge-Aggregation100

port link-type trunk

port trunk permit vlan 1 100

link-aggregation mode dynamic

port m-lag group 1

interface Bridge-Aggregation101

port link-type trunk

port trunk permit vlan 1 101

link-aggregation mode dynamic

port m-lag group 2

interface Bridge-Aggregation125

port link-type trunk

port trunk permit vlan all

link-aggregation mode dynamic

port m-lag peer-link 1

interface Vlan-interface10

ip address 10.1.1.1 255.255.255.0

interface Vlan-interface100

ip address 100.1.1.1 255.255.255.0

vrrp vrid 1 virtual-ip 100.1.1.100

vrrp vrid 1 priority 200

vrrp vrid 1 preempt-mode delay 500

vrrp vrid 1 track 1 priority reduced 150

interface Vlan-interface101

ip address 101.1.1.1 255.255.255.0

vrrp vrid 2 virtual-ip 101.1.1.100

interface Twenty-FiveGigE1/0/5

port link-mode route

ip address 1.1.1.1 255.255.255.0

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 100

port link-aggregation group 100

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 101

port link-aggregation group 101

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port link-type trunk

port trunk permit vlan all

port link-aggregation group 125

interface Twenty-FiveGigE1/0/4

port link-mode bridge

port link-type trunk

port trunk permit vlan all

port link-aggregation group 125

interface Twenty-FiveGigE1/0/6

port link-mode bridge

port access vlan 10

m-lag system-mac 0001-0001-0001

m-lag system-number 1

m-lag system-priority 123

m-lag keepalive ip destination 1.1.1.2 source 1.1.1.1

m-lag mad exclude interface Twenty-FiveGigE1/0/5

track 1 interface Twenty-FiveGigE1/0/6

· Device B:

ospf 1

area 0.0.0.0

network 20.1.1.0 0.0.0.255

network 100.1.1.0 0.0.0.255

network 101.1.1.0 0.0.0.255

vlan 20

vlan 100 to 101

interface Bridge-Aggregation100

port link-type trunk

port trunk permit vlan 1 100

link-aggregation mode dynamic

port m-lag group 1

interface Bridge-Aggregation101

port link-type trunk

port trunk permit vlan 1 101

link-aggregation mode dynamic

port m-lag group 2

interface Bridge-Aggregation125

port link-type trunk

port trunk permit vlan all

link-aggregation mode dynamic

port m-lag peer-link 1

interface Vlan-interface20

ip address 20.1.1.1 255.255.255.0

interface Vlan-interface100

ip address 100.1.1.2 255.255.255.0

vrrp vrid 1 virtual-ip 100.1.1.100

interface Vlan-interface101

ip address 101.1.1.2 255.255.255.0

vrrp vrid 2 virtual-ip 101.1.1.100

vrrp vrid 2 priority 200

vrrp vrid 2 preempt-mode delay 500

vrrp vrid 2 track 2 priority reduced 150

interface Twenty-FiveGigE1/0/5

port link-mode route

ip address 1.1.1.2 255.255.255.0

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 101

port link-aggregation group 101

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 100

port link-aggregation group 100

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port link-type trunk

port trunk permit vlan all

port link-aggregation group 125

interface Twenty-FiveGigE1/0/4

port link-mode bridge

port link-type trunk

port trunk permit vlan all

port link-aggregation group 125

interface Twenty-FiveGigE1/0/6

port link-mode bridge

port access vlan 20

m-lag system-mac 0001-0001-0001

m-lag system-number 2

m-lag system-priority 123

m-lag keepalive ip destination 1.1.1.1 source 1.1.1.2

m-lag mad exclude interface Twenty-FiveGigE1/0/5

track 2 interface Twenty-FiveGigE1/0/6

· Device C:

vlan 100

interface Bridge-Aggregation100

port link-type trunk

port trunk permit vlan 1 100

link-aggregation mode dynamic

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 100

port link-aggregation group 100

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 100

port link-aggregation group 100

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port access vlan 100

· Device D:

vlan 101

interface Bridge-Aggregation101

port link-type trunk

port trunk permit vlan 1 101

link-aggregation mode dynamic

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 101

port link-aggregation group 101

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port link-type trunk

port trunk permit vlan 1 101

port link-aggregation group 101

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port access vlan 101

· Device E:

ospf 1

area 0.0.0.0

network 10.1.1.0 0.0.0.255

network 20.1.1.0 0.0.0.255

network 30.1.1.0 0.0.0.255

vlan 10

vlan 20

vlan 30

interface Vlan-interface10

ip address 10.1.1.2 255.255.255.0

interface Vlan-interface20

ip address 20.1.1.2 255.255.255.0

interface Vlan-interface30

ip address 30.1.1.1 255.255.255.0

interface Twenty-FiveGigE1/0/1

port link-mode bridge

port access vlan 10

interface Twenty-FiveGigE1/0/2

port link-mode bridge

port access vlan 20

interface Twenty-FiveGigE1/0/3

port link-mode bridge

port access vlan 30

02-Layer 2—LAN Switching Configuration Examples

Network configuration

Applicable hardware and software versions

Procedures

Configuring Device B

Configuring Device C

Configuring Device D

Configuring Device E

Verifying the configuration

Configuration files

Example: Configuring M-LAG at the distribution Layer

Network configuration

Applicable hardware and software versions

Procedures

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