As shown in Figure 1, DRNI virtualizes two devices into a distributed-relay (DR) system, which connects to the remote aggregation system through a multichassis aggregate link. To the remote aggregation system, the DR system is one device.

Figure 1 DRNI network model

The DR member devices are DR peers to each other. For features that require centralized traffic processing (for example, spanning tree), a DR member device is assigned the primary or secondary role based on its DR role priority. The secondary DR device passes the traffic of those features to the primary DR device for processing. If the DR member devices in a DR system have the same DR role priority, the device with the lower bridge MAC address is assigned the primary role.

DRNI defines the following interface roles for each DR member device:

· DR interface—Layer 2 aggregate interface connected to the remote aggregation system. DR interfaces connected to the same remote aggregation system belong to one DR group. In Figure 1, Bridge-Aggregation 1 on Device A and Bridge-Aggregation 2 on Device B belong to the same DR group. DR interfaces in a DR group form a multichassis aggregate link.

· Intra-portal port (IPP)—Interface connected to the DR peer for internal control. Each DR member device has only one IPP. The IPPs of the DR member devices transmit DRNI protocol packets and data packets through the intra-portal link (IPL) established between them. A DR system has only one IPL.

DR member devices use a keepalive link to monitor each other's state. For more information about the keepalive mechanism, see "Keepalive and failover mechanism."

DRCP

DRNI uses IEEE P802.1AX Distributed Relay Control Protocol (DRCP) for multichassis link aggregation. DRCP runs on the IPL and uses distributed relay control protocol data units (DRCPDUs) to advertise the DRNI configuration out of IPPs and DR interfaces.

DRCP operating mechanism

DRNI-enabled devices use DRCPDUs for the following purposes:

· Exchange DRCPDUs through DR interfaces to determine whether they can form a DR system.

· Exchange DRCPDUs through IPPs to negotiate the IPL state.

DRCP timeout timers

DRCP uses a timeout mechanism to specify the amount of time that an IPP or DR interface must wait to receive DRCPDUs before it determines that the peer interface is down. This timeout mechanism provides the following timer options:

· Short DRCP timeout timer, which is fixed at 3 seconds. If this timer is used, the peer interface sends one DRCPDU every second.

· Long DRCP timeout timer, which is fixed at 90 seconds. If this timer is used, the peer interface sends one DRCPDU every 30 seconds.

Short DRCP timeout timer enables the DR member devices to detect a peer interface down event more quickly than the long DRCP timeout timer. However this benefit is at the expense of bandwidth and system resources.

Keepalive and failover mechanism

For the secondary DR device to monitor the state of the primary device, you must establish a Layer 3 keepalive link between the DR member devices.

The DR member devices periodically send keepalive packets over the keepalive link. The secondary DR device determines that the primary DR device is down if all the following conditions are met when the keepalive timeout timer expires:

· It has not received keepalive packets from the primary DR device. In this situation, the keepalive link is down.

· The IPL is down.

Then, the secondary DR device takes over.

If the keepalive link is down while the IPL is up, the DR member devices prompt you to check for keepalive link issues.

MAD mechanism

A multi-active collision occurs if the IPL goes down while the keepalive link is up. To avoid network issues, the secondary DR device sets all network interfaces to DRNI MAD DOWN state, except for the following interfaces:

· Interfaces excluded from the MAD shutdown action by IRF.

· Interfaces excluded from the MAD shutdown action by DRNI.

When the IPL comes up, the secondary DR device starts a delay timer and begins to restore table entries (including MAC address entries and ARP entries) from the primary DR device. When the delay timer expires, the secondary DR device brings up all network interfaces.

IMPORTANT:

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

You can use the display drni mad verbose command to view detailed information about DRNI MAD.

DR system setup process

As shown in Figure 2, two devices perform the following operations to form a DR system:

1. Send DRCPDUs over the IPL to each other and compare the DRCPDUs to determine the DR system stackability and device roles:

a. Compare the DR system settings. The devices can form a DR system if they have the same DR system MAC address and system priority and different DR system numbers.

b. Determine the device roles based on the DR role priority and the bridge MAC address.

c. Perform configuration consistency check. For more information, see "Configuration consistency check."

2. Send keepalive packets over the keepalive link to verify that the peer system is operating correctly.

3. Synchronize configuration data by sending DRCPDUs over the IPL. The configuration data includes MAC address entries and ARP entries.

Figure 2 DR system setup process

Configuration consistency check

During DR system setup, DR member devices exchange the configuration and perform configuration consistency check to verify their consistency in the following configurations:

· Type 1 configuration—Settings that affect traffic forwarding of the DR system. If an inconsistency in type 1 configuration is detected, the secondary DR device shuts down its DR interfaces.

· Type 2 configuration—Settings that affect only service features. If an inconsistency in type 2 configuration is detected, the secondary DR device disables the affected service features, but it does not shut down its DR interfaces.

To prevent interface flapping, the DR system performs configuration consistency check when half the data restoration interval has elapsed.

NOTE:

The data restoration interval specifies the maximum amount of time for the secondary DR device to synchronize data with the primary DR device during DR system setup.

Type 1 configuration

Type 1 configuration consistency check is performed both globally and on DR interfaces. Table 1 and Table 2 show settings that type 1 configuration contains.

Table 1 Global type 1 configuration

Setting	Details
IPP link type	IPP link type, which can be access, hybrid, or trunk.
PVID on the IPP	PVID on the IPP.
Spanning tree state	· Global spanning tree state. · VLAN-specific spanning tree state.
Spanning tree mode	Spanning tree mode, including STP, RSTP, PVST, and MSTP.
MST region settings	· MST region name. · MST region revision level. · VLAN-to-MSTI mappings.

Table 2 DR interface type 1 configuration

Setting	Details
Aggregation mode	Aggregation mode, including static and dynamic.
Spanning tree state	Interface-specific spanning tree state.
Link type	Interface link type, including access, hybrid, and trunk.
PVID	Interface PVID.

Type 2 configuration

Type 2 configuration consistency check is performed both globally and on DR interfaces. Table 3 and Table 4 show settings that type 2 configuration contains.

Table 3 Global type 2 configuration

Setting	Details
VLAN interfaces	Up VLAN interfaces of which the VLANs contain the IPP.
Passing tagged VLANs or passing PVID	VLANs of which the IPP forwards tagged traffic or PVID of which the IPP forwards traffic.

Table 4 DR interface type 2 configuration

Setting	Details
Passing tagged VLANs	VLANs of which a DR interface forwards tagged traffic.
Passing untagged VLANs	VLANs of which a DR interface forwards untagged traffic.

DRNI failure handling mechanisms

DR interface failure handling mechanism

When the DR interface of one DR member device fails, the DR system forwards traffic through the other DR member device.

As shown in Figure 3, Device A and Device B form a DR system, to which Device C is attached through a multichassis aggregation. If traffic to Device C arrives at Device B after the DR interface connected Device B to Device C has failed, the DR system forwards the traffic as follows:

1. Device B sends the traffic to Device A over the IPL.

2. Device A forwards the downlink traffic received from the IPL to Device C.

After the faulty DR interface comes up, Device B forwards traffic to Device C through the DR interface.

Figure 3 DR interface failure handling mechanism

IPL failure handling mechanism

As shown in Figure 4, multi-active collision occurs if the IPL goes down while the keepalive link is up. To avoid network issues, the secondary DR device sets all network interfaces to DRNI MAD DOWN state, except for the following interfaces:

· Interfaces excluded from the MAD shutdown action by IRF.

· Interfaces excluded from the MAD shutdown action by DRNI.

In this situation, the primary DR device forwards all traffic for the DR system.

When the IPP comes up, the secondary DR device does not bring up the network interfaces immediately. Instead, it starts a delay timer and begins to recover data from the primary DR device. When the delay timer expires, the secondary DR device brings up all network interfaces.

Figure 4 IPL failure handling mechanism

Device failure handling mechanism

As shown in Figure 5, when the primary DR device fails, the secondary DR device takes over the primary role to forward all traffic for the DR system. When the faulty device recovers, it becomes the secondary DR device.

When the secondary DR device fails, the primary DR device forwards all traffic for the DR system.

Figure 5 Device failure handling mechanism

Protocols and standards

IEEE P802.1AX-REV™/D4.4c, Draft Standard for Local and Metropolitan Area Networks

Configuration restrictions and guidelines

Feature compatibility restrictions

DRNI cannot work in conjunction with IRF.

On a DRNI system, you can use only the following features:

Category	Features
Layer 2—LAN switching	MAC address table. Layer 2 Ethernet link aggregation. VLAN. Spanning tree. LLDP.
Layer 3—IP services	ARP.
Routing	OSPF. BGP.
High availability	VRRP.
Network management and monitoring	NTP.

When you use the Ethernet link aggregation and MAC address table features, follow these guidelines:

· DRNI cannot work in conjunction with automatic link aggregation, which is configurable with the link-aggregation auto-aggregation enable command.

· The DR member devices cannot synchronize their static and blackhole MAC address entries. If you are using these two types of entries, you must manually configure them on both member devices.

· For correct forwarding, do not use the mac-address max-mac-count command in VLAN view to set a MAC address learning limit on a VLAN.

DRNI configuration restrictions and guidelines

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

For correct traffic forwarding, make sure the DR member devices are consistent in service feature settings.

When you configure a DR interface, follow these restrictions and guidelines:

· For correct forwarding, make sure the peer DR interfaces have the same configuration.

· The link-aggregation selected-port maximum and link-aggregation selected-port minimum commands do not take effect on a DR interface.

· If you execute the display link-aggregation verbose command for a DR interface, the displayed system ID contains the DR system MAC address and the DR system priority.

· If the reference port is a member port of a DR interface, the display link-aggregation verbose command displays the reference port on both DR member devices.

For more information about Ethernet link aggregation, see Layer 2—LAN Switching Configuration Guide.

DRNI tasks at a glance

To configure DRNI, perform the following tasks:

1. Configuring DR system settings

¡ Configuring the DR system MAC address

¡ Setting the DR system number

¡ Setting the DR system priority

2. Setting the DR role priority of the device

3. Configuring DR keepalive settings

¡ Excluding an interface from the shutdown action by DRNI MAD

¡ Configuring DR keepalive packet parameters

¡ Setting the DR keepalive interval and timeout timer

4. Configuring a DR interface

5. Specifying a Layer 2 aggregate interface as the IPP

6. (Optional.) Disabling configuration consistency check

Configuration consistency check might fail when you upgrade the DR member devices in a DR system. To prevent the DR system from falsely shutting down DR interfaces, you can temporarily disable configuration consistency check.

7. (Optional.) Enabling the short DRCP timeout timer on the IPP or a DR interface

8. (Optional.) Setting the keepalive hold timer for identifying the cause of IPL down events

9. Configuring DR system auto-recovery

10. (Optional.) Setting the data restoration interval

Configuring DR system settings

Configuring the DR system MAC address

Configuration restrictions and guidelines

Changing the DR system MAC address causes DR system split. When you perform this task on a live network, make sure you are fully aware of its impact.

The DR system MAC address uniquely identifies the DR system on the network. For the DR member devices to be identified as one DR system, you must configure the same DR system MAC address on them. As a best practice, use the bridge MAC address of one DR member device as the DR system MAC address.

Configuration procedure

To configure the DR system MAC address:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Configure the DR system MAC address.	drni system-mac mac-address	By default, the DR system MAC address is not configured.

Setting the DR system number

Configuration restrictions and guidelines

Changing the DR system number causes DR system split. When you perform this task on a live network, make sure you are fully aware of its impact.

You must assign different DR system numbers to the DR member devices in a DR system.

Configuration procedure

To set the DR system number:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Set the DR system number.	drni system-number system-number	By default, the DR system number is not set.

Setting the DR system priority

Overview

A DR system uses its DR system priority as the system LACP priority to communicate with the remote aggregation system.

Configuration restrictions and guidelines

Changing the DR system priority causes DR system split. When you perform this task on a live network, make sure you are fully aware of its impact.

You must configure the same DR system priority for the DR member devices in a DR system.

Configuration procedure

To set the DR system priority:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Set the DR system priority.	drni system-priority system-priority	By default, the DR system priority is 32768.

Setting the DR role priority of the device

Overview

DRNI assigns the primary or secondary role to a DR member device based on its DR role priority. The smaller the priority value, the higher the priority. If the DR member devices in a DR system use the same DR role priority, the device with the lower bridge MAC address is assigned the primary role.

Configuration restrictions and guidelines

To prevent a primary/secondary role switchover from causing network flapping, avoid changing the DR priority assignment after the DR system is established.

Configuration procedure

To set the DR role priority of the device:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Set the DR role priority of the device.	drni role priority priority-value	By default, the DR role priority of the device is 32768.

Configuring DR keepalive settings

Configuration restrictions and guidelines

Use Layer 3 Ethernet interfaces or management Ethernet interfaces to set up the keepalive link.

Make sure the two ends use the same keepalive settings. DR member devices check the peer keepalive settings for consistency. If an inconsistency is found, the device will prompt for configuration revision.

Excluding an interface from the shutdown action by DRNI MAD

Overview

When DRNI MAD detects a multi-active collision, DRNI sets all network interfaces on the secondary DR device to DRNI MAD DOWN state, except for the following interfaces:

· Interfaces excluded from the MAD shutdown action by IRF.

· Interfaces excluded from the MAD shutdown action by DRNI.

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

Configuration restrictions and guidelines

To view interfaces excluded from the MAD shutdown action, see the Excluded ports (user-configured) field in the output from the display drni mad verbose command.

If you exclude an interface that is already in DRNI MAD DOWN state from the MAD shutdown action, the interface stays in that state. It will not come up automatically.

Configuration procedure

To exclude an interface from the MAD shutdown action by DRNI:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Exclude an interface from the MAD shutdown action by DRNI.	drni mad exclude interface interface-type interface-number	By default, DRNI MAD shuts down all network interfaces when detecting a multi-active collision, except for the IPP, IRF physical interfaces, and the management Ethernet interface.

Configuring DR keepalive packet parameters

Overview

Perform this task to specify the parameters for sending DR keepalive packets, such as its source and destination IP addresses.

The device accepts only keepalive packets that are sourced from the specified destination IP address. The keepalive link goes down if the device receives keepalive packets sourced from any other IP address.

Configuration restrictions and guidelines

Make sure the DR member devices in a DR system use the same keepalive destination UDP port.

Configuration procedure

To configure DR keepalive packet parameters:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Configure DR keepalive packet parameters.	drni keepalive { ip \| ipv6 } destination { ipv4-address \| ipv6-address } [ source { ipv4-address \| ipv6-address } \| udp-port udp-number \| vpn-instance vpn-instance-name ] *	By default, the DR keepalive packet parameters are not configured. If you do not specify a source IP address or destination UDP port when you execute this command, the IP address of the outgoing interface and UDP port 6400 are used, respectively.

Setting the DR keepalive interval and timeout timer

Overview

The device sends keepalive packets at the specified interval to its DR peer. If the device has not received a keepalive packet from the DR peer before the keepalive timeout timer expires, the device determines that the keepalive link is down.

Configuration restrictions and guidelines

The local DR keepalive timeout timer must be two times the DR keepalive interval of the peer at minimum.

Configure the same DR keepalive interval on the DR member devices in the DR system.

Configuration procedure

To set the DR keepalive interval and timeout timer:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Set the DR keepalive interval and timeout timer.	drni keepalive interval interval [ timeout timeout ]	By default, the DR keepalive interval is 1000 milliseconds, and the DR keepalive timeout timer is 5 seconds.

Configuring a DR interface

Configuration restrictions and guidelines

The device can have multiple DR interfaces. However, you can assign a Layer 2 aggregate interface to only one DR group.

A Layer 2 aggregate interface cannot operate as both IPP and DR interface.

To improve forwarding efficiency, exclude the DR interface on the secondary DR device from the shutdown action by DRNI MAD. This action enables the DR interface to forward traffic immediately after a multi-active collision is removed without having to wait for the secondary DR device to complete entry restoration.

Configuration procedure

To configure a DR interface:

Step	Command
1. Enter system view.	system-view
2. Enter Layer 2 aggregate interface view.	interface bridge-aggregation interface-number
3. Assign the aggregate interface to a DR group.	port drni group group-id

Specifying a Layer 2 aggregate interface as the IPP

Configuration restrictions and guidelines

A DR member device can have only one IPP. A Layer 2 aggregate interface cannot operate as both IPP and DR interface.

To prevent data synchronization failure, you must set the same maximum jumbo frame length on the IPPs of the DR member devices. For more information about jumbo frames, see "Configuring Ethernet link aggregation."

For the IPL to operate, you must assign the peer IPP interfaces to the PVID. As a best practice, assign the IPP interfaces to all VLANs, by using the port trunk permit vlan all command.

On an IPP, you can execute only the following commands:

· link-aggregation mode dynamic.

· drni drcp period short.

· Port-based VLAN commands:

¡ port access vlan.

¡ port hybrid pvid.

¡ port hybrid vlan.

¡ port link-type.

¡ port trunk permit vlan.

¡ port trunk pvid.

The following features are automatically disabled on the member Ethernet interfaces in the aggregation group of an IPP:

· Static source check, which is configurable with the mac-address static source-check enable command.

· MAC address learning on the interface, which is configurable with the mac-address mac-learning enable command.

When a member interface is removed from the aggregation group for the IPP, static source check and MAC address learning are automatically enabled on that interface.

Configuration procedure

To configure an IPP:

Step	Command
1. Enter system view.	system-view
2. Enter Layer 2 aggregate interface view.	interface bridge-aggregation interface-number
3. Specify the interface as the IPP.	port drni intra-portal-port port-id

Disabling configuration consistency check

Overview

To ensure that the DR system can operate correctly, DRNI by default performs configuration consistency check when the DR system is set up.

Configuration restrictions and guidelines

Make sure the DR member devices use the same setting for configuration consistency check.

Configuration procedure

To disable configuration consistency check:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Disable configuration consistency check.	drni consistency-check disable	By default, configuration consistency check is enabled.

Enabling the short DRCP timeout timer on the IPP or a DR interface

Overview

By default, the IPP or a DR interface uses the 90-second long DRCP timeout timer. To detect peer interface down events more quickly, enable the 3-second short DRCP timeout timer on the interface.

Configuration restrictions and guidelines

To avoid traffic interruption during an ISSU or DRNI process restart, disable the short DRCP timeout timer before you perform an ISSU or DRNI process restart. For more information about ISSU, see Fundamentals Configuration Guide.

Configuration procedure

To enable the short DRCP timeout timer:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Layer 2 aggregate interface view.	interface bridge-aggregation interface-number	N/A
3. Enable the short DRCP timeout timer.	drni drcp period short	By default, an interface uses the long DRCP timeout timer (90 seconds).

Setting the keepalive hold timer for identifying the cause of IPL down events

Overview

The keepalive hold timer starts when the IPL goes down. The keepalive hold timer specifies the amount of time that the device uses to identify the cause of an IPL down event.

· If the device receives keepalive packets from the DR peer before the timer expires, the IPL is down because the IPL fails.

· If the device does not receive keepalive packets from the DR peer before the timer expires, the IPL is down because the peer DR device fails.

Configuration restrictions and guidelines

For the DR member device to correctly determine the cause of an IPL down event, make sure the keepalive hold timer is longer than the keepalive interval and is shorter than the keepalive timeout timer.

Configuration procedure

To set the keepalive hold timer:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Set the keepalive hold timer.	drni keepalive hold-time value	By default, the keepalive hold timer is 3 seconds.

Configuring DR system auto-recovery

Overview

If only one DR member device recovers after the entire DR system reboots, auto-recovery enables that member device to take over the primary role when the reload delay timer expires. Then, the member device can forward traffic through its DR interfaces.

If auto-recovery is disabled, that DR member device will be stuck in the None role with all its DR interfaces being down after it recovers.

Configuration restrictions and guidelines

If both DR member devices recover after the entire DR system reboots, active-active situation might occur if both IPL and keepalive links were down when the reload delay timer expires. If this rare situation occurs, examine the IPL and keepalive links and restore them.

Configuration procedure

To configure DR system auto-recovery:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Configure DR system auto-recovery.	drni auto-recovery reload-delay delay-value	By default, DR system auto-recovery is not configured. The reload delay timer is not set.

Setting the data restoration interval

Overview

The data restoration interval specifies the maximum amount of time for the secondary DR device to synchronize data with the primary DR device during DR system setup. Within the data restoration interval, the secondary DR device sets all network interfaces to DRNI MAD DOWN state, except for the following interfaces:

· Interfaces excluded from the MAD shutdown action by IRF.

· Interfaces excluded from the MAD shutdown action by DRNI.

When the data restoration interval expires, the secondary DR device brings up all network interfaces.

Configuration restrictions and guidelines

Increase the data restoration interval as needed in the following situations:

· Avoid packet loss and forwarding failure that might occur when the amount of data is large or when you perform an ISSU between the DR member devices.

· Avoid DR interface flapping that might occur if type 1 configuration consistency check fails after the DR interfaces come up upon expiration of the data restoration interval.

Configuration procedure

To set the data restoration interval:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Set the data restoration interval.	drni restore-delay value	By default, the data restoration interval is 30 seconds.

Displaying and maintaining DRNI

Execute display commands in any view and reset commands in user view.

Task	Command
Display information about the configuration consistency check done by DRNI.	display drni consistency { type1 \| type2 } { global \| interface interface-type interface-number }
Display DRCPDU statistics.	display drni drcp statistics [ interface interface-type interface-number ]
Display DR keepalive packet statistics.	display drni keepalive
Display detailed DRNI MAD information.	display drni mad verbose
Display DR role information.	display drni role
Display brief information about the IPP and DR interfaces.	display drni summary
Display the DR system settings.	display drni system
Display detailed information about the IPP and DR interfaces.	display drni verbose [ bridge-aggregation interface-number ]
Clear DRCPDU statistics.	reset drni drcp statistics [ interface interface-list ]

DRNI configuration examples

Basic DRNI function configuration example

Network requirements

As shown in Figure 6, configure DRNI on Device A and Device B to establish a multichassis aggregate link with Device C.

Figure 6 Network diagram

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Configuration procedure

1. Configure Device A:

# Configure DR system settings.

<DeviceA> system-view

[DeviceA] drni system-mac 1-1-1

[DeviceA] drni system-number 1

[DeviceA] drni system-priority 123

# Configure DR keepalive packet parameters.

[DeviceA] drni keepalive ip destination 1.1.1.1 source 1.1.1.2

# Set the link mode of GigabitEthernet 1/0/5 to Layer 3, and assign the interface an IP address. The IP address will be used as the source IP address of keepalive packets.

[DeviceA] interface gigabitethernet 1/0/5

[DeviceA-GigabitEthernet1/0/5] port link-mode route

[DeviceA-GigabitEthernet1/0/5] ip address 1.1.1.2 24

[DeviceA-GigabitEthernet1/0/5] quit

# Exclude the interface used for DR keepalive detection (GigabitEthernet 1/0/5) from the shutdown action by DRNI MAD.

[DeviceA] drni mad exclude interface gigabitethernet 1/0/5

# 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 GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 to aggregation group 3.

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] port link-aggregation group 3

[DeviceA-GigabitEthernet1/0/1] quit

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] port link-aggregation group 3

[DeviceA-GigabitEthernet1/0/2] quit

# Specify Bridge-Aggregation 3 as the IPP.

[DeviceA] interface bridge-aggregation 3

[DeviceA-Bridge-Aggregation3] port drni intra-portal-port 1

[DeviceA-Bridge-Aggregation3] quit

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

[DeviceA] interface bridge-aggregation 4

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

[DeviceA-Bridge-Aggregation4] quit

# Assign GigabitEthernet 1/0/3 and GigabitEthernet 1/0/4 to aggregation group 4.

[DeviceA] interface gigabitethernet 1/0/3

[DeviceA-GigabitEthernet1/0/3] port link-aggregation group 4

[DeviceA-GigabitEthernet1/0/3] quit

[DeviceA] interface gigabitethernet 1/0/4

[DeviceA-GigabitEthernet1/0/4] port link-aggregation group 4

[DeviceA-GigabitEthernet1/0/4] quit

# Assign Bridge-Aggregation 4 to DR group 4.

[DeviceA] interface bridge-aggregation 4

[DeviceA-Bridge-Aggregation4] port drni group 4

[DeviceA-Bridge-Aggregation4] quit

2. Configure Device B:

# Configure DR system settings.

<DeviceB> system-view

[DeviceB] drni system-mac 1-1-1

[DeviceB] drni system-number 2

[DeviceB] drni system-priority 123

# Configure DR keepalive packet parameters.

[DeviceB] drni keepalive ip destination 1.1.1.2 source 1.1.1.1

# Set the link mode of GigabitEthernet 1/0/5 to Layer 3, and assign the interface an IP address. The IP address will be used as the source IP address of keepalive packets.

[DeviceB] interface gigabitethernet 1/0/5

[DeviceB-GigabitEthernet1/0/5] port link-mode route

[DeviceB-GigabitEthernet1/0/5] ip address 1.1.1.1 24

[DeviceB-GigabitEthernet1/0/5] quit

# Exclude the interface used for DR keepalive detection (GigabitEthernet 1/0/5) from the shutdown action by DRNI MAD.

[DeviceB] drni mad exclude interface gigabitethernet 1/0/5

# 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 GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 to aggregation group 3.

[DeviceB] interface gigabitethernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] port link-aggregation group 3

[DeviceB-GigabitEthernet1/0/1] quit

[DeviceB] interface gigabitethernet 1/0/2

[DeviceB-GigabitEthernet1/0/2] port link-aggregation group 3

[DeviceB-GigabitEthernet1/0/2] quit

# Specify Bridge-Aggregation 3 as the IPP.

[DeviceB] interface bridge-aggregation 3

[DeviceB-Bridge-Aggregation3] port drni intra-portal-port 1

[DeviceB-Bridge-Aggregation3] quit

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

[DeviceB] interface bridge-aggregation 4

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

[DeviceB-Bridge-Aggregation4] quit

# Assign GigabitEthernet 1/0/3 and GigabitEthernet 1/0/4 to aggregation group 4.

[DeviceB] interface gigabitethernet 1/0/3

[DeviceB-GigabitEthernet1/0/3] port link-aggregation group 4

[DeviceB-GigabitEthernet1/0/3] quit

[DeviceB] interface gigabitethernet 1/0/4

[DeviceB-GigabitEthernet1/0/4] port link-aggregation group 4

[DeviceB-GigabitEthernet1/0/4] quit

# Assign Bridge-Aggregation 4 to DR group 4.

[DeviceB] interface bridge-aggregation 4

[DeviceB-Bridge-Aggregation4] port drni group 4

[DeviceB-Bridge-Aggregation4] quit

3. Configure Device C:

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

<DeviceC> system-view

[DeviceC] interface bridge-aggregation 4

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

[DeviceC-Bridge-Aggregation4] quit

# Assign GigabitEthernet 1/0/1 through GigabitEthernet 1/0/4 to aggregation group 4.

[DeviceC] interface range gigabitethernet 1/0/1 to gigabitethernet 1/0/4

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

[DeviceC-if-range] quit

Verifying the configuration

# Verify that the keepalive link is working correctly on Device A.

[DeviceA] display drni keepalive

Neighbor keepalive link status: Up

Neighbor is alive for: 104 sec, 16 ms

Last keepalive packet sending status: Successful

Last keepalive packet sending time: 2017/03/09 10:12:09 620 ms

Last keepalive packet receiving status: Successful

Last keepalive packet receiving time: 2017/03/09 10:12:09 707 ms

Distributed relay keepalive parameters:

Destination IP address: 1.1.1.1

Source IP address: 1.1.1.2

Keepalive UDP port : 6400

Keepalive VPN name : N/A

Keepalive interval : 1000 ms

Keepalive timeout : 5 sec

Keepalive hold time: 3 sec

# Verify that the IPP and the DR interface are working correctly on Device A.

[DeviceA] display drni summary

Global consistency check : SUCCESS

Inconsistent type 1 global settings: -

IPP IPP ID State

BAGG3 1 UP

DR interface DR group ID State Check result Type 1 inconsistency

BAGG4 4 UP SUCCESS -

[DeviceA] display drni verbose

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

D -- IPP_Activity, E -- DRCP_Timeout, F -- Gateway_Sync,

G -- Port_Sync, H -- Expired

IPP/IPP ID: BAGG3/1

State: UP

Local state/Peer state: ABDFG/ABDFG

Local Selected ports Index: 1, 2

Peer Selected ports Index: 1, 2

DR interface/DR group ID: BAGG4/4

State: UP

Local state/Peer state: ABDFG/ABDFG

Local Selected ports Index: 16387, 16388

Peer Selected ports Index: 32771, 32772

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

[DeviceC] display link-aggregation verbose bridge-aggregation 4

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

Aggregation Mode: Dynamic

Loadsharing Type: Shar

Management VLANs: None

System ID: 0x8000, 2e56-cbae-0600

Local:

Port Status Priority Index Oper-Key Flag

GE1/0/1(R) S 32768 1 1 {ACDEF}

GE1/0/2 S 32768 2 1 {ACDEF}

GE1/0/3 S 32768 3 1 {ACDEF}

GE1/0/4 S 32768 4 1 {ACDEF}

Remote:

Actor Priority Index Oper-Key SystemID Flag

GE1/0/1 32768 16387 40004 0x7b , 0001-0001-0001 {ACDEF}

GE1/0/2 32768 16388 40004 0x7b , 0001-0001-0001 {ACDEF}

GE1/0/3 32768 32771 40004 0x7b , 0001-0001-0001 {ACDEF}

GE1/0/4 32768 32772 40004 0x7b , 0001-0001-0001 {ACDEF}

DRNI Layer 3 forwarding configuration example

Network requirements

As shown in Figure 7:

· Configure Device A and Device B as a DR system to establish one multichassis aggregate link with Device C and one with Device D.

· Set up a keepalive link between GigabitEthernet 1/0/5 of Device A and GigabitEthernet 1/0/5 of Device B, and exclude the interfaces from the shutdown action by DRNI MAD.

· Configure two VRRP groups on Device A and Device B to provide gateway services for VLAN 100 and VLAN 200. Configure Device A as the master of the VRRP groups.

Figure 7 Network diagram

‌

Configuration procedure

1. Configure Device A:

# Configure DR system settings.

<DeviceA> system-view

[DeviceA] drni system-mac 1-1-1

[DeviceA] drni system-number 1

[DeviceA] drni system-priority 123

# Configure DR keepalive parameters.

[DeviceA] drni keepalive ip destination 1.1.1.2 source 1.1.1.1

# Set the link mode of GigabitEthernet 1/0/5 to Layer 3, and assign the interface an IP address. The IP address will be used as the source IP address of keepalive packets.

[DeviceA] interface gigabitethernet 1/0/5

[DeviceA-GigabitEthernet1/0/5] port link-mode route

[DeviceA-GigabitEthernet1/0/5] ip address 1.1.1.1 24

[DeviceA-GigabitEthernet1/0/5] quit

# Exclude the interface used for DR keepalive detection (GigabitEthernet 1/0/5) from the shutdown action by DRNI MAD.

[DeviceA] drni mad exclude interface gigabitethernet 1/0/5

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 125, and specify it as the IPP.

[DeviceA] interface bridge-aggregation 125

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

[DeviceA-Bridge-Aggregation125] port drni intra-portal-port 1

[DeviceA-Bridge-Aggregation125] quit

# Assign GigabitEthernet 1/0/3 and GigabitEthernet 1/0/4 to aggregation group 125.

[DeviceA] interface gigabitethernet 1/0/3

[DeviceA-GigabitEthernet1/0/3] port link-aggregation group 125

[DeviceA-GigabitEthernet1/0/3] quit

[DeviceA] interface GigabitEthernet 1/0/4

[DeviceA-GigabitEthernet1/0/4] port link-aggregation group 125

[DeviceA-GigabitEthernet1/0/4] quit

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

[DeviceA] interface bridge-aggregation 100

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

[DeviceA-Bridge-Aggregation100] port drni group 1

[DeviceA-Bridge-Aggregation100] quit

# Assign GigabitEthernet 1/0/1 to aggregation group 100.

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] port link-aggregation group 100

[DeviceA-GigabitEthernet1/0/1] quit

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

[DeviceA] interface bridge-aggregation 101

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

[DeviceA-Bridge-Aggregation101] port drni group 2

[DeviceA-Bridge-Aggregation101] quit

# Assign GigabitEthernet 1/0/2 to aggregation group 101.

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] port link-aggregation group 101

[DeviceA-GigabitEthernet1/0/2] quit

# Create VLAN 100 and VLAN 101.

[DeviceA] vlan 100

[DeviceA-vlan100] quit

[DeviceA] vlan 101

[DeviceA-vlan101] 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

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

[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

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

[DeviceA-Bridge-Aggregation101] quit

# Set the link type of Bridge-Aggregation 125 to trunk, and assign it to VLAN 100 and VLAN 101.

[DeviceA] interface bridge-aggregation 125

[DeviceA-Bridge-Aggregation125] port link-type trunk

[DeviceA-Bridge-Aggregation125] port trunk permit vlan 100 101

[DeviceA-Bridge-Aggregation125] quit

# Create VLAN-interface 100 and VLAN-interface 101, and assign IP addresses to them.

[DeviceA] interface vlan-interface 100

[DeviceA-vlan-interface100] ip address 10.1.1.1 24

[DeviceA-vlan-interface100] quit

[DeviceA] interface vlan-interface 101

[DeviceA-vlan-interface101] ip address 20.1.1.1 24

[DeviceA-vlan-interface101] quit

# Configure OSPF.

[DeviceA] ospf

[DeviceA-ospf-1] import-route direct

[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 20.1.1.0 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 10.1.1.100.

[DeviceA] interface vlan-interface 100

[DeviceA-Vlan-interface100] vrrp vrid 1 virtual-ip 10.1.1.100

# 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 20.1.1.100.

[DeviceA] interface vlan-interface 101

[DeviceA-Vlan-interface101] vrrp vrid 2 virtual-ip 20.1.1.100

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

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

[DeviceA-Vlan-interface101] quit

2. Configure Device B:

# Configure DR system settings.

<DeviceB> system-view

[DeviceB] drni system-mac 1-1-1

[DeviceB] drni system-number 2

[DeviceB] drni system-priority 123

# Configure DR keepalive parameters.

[DeviceB] drni keepalive ip destination 1.1.1.1 source 1.1.1.2

# Set the link mode of GigabitEthernet 1/0/5 to Layer 3, and assign the interface an IP address. The IP address will be used as the source IP address of keepalive packets.

[DeviceB] interface gigabitethernet 1/0/5

[DeviceB-GigabitEthernet1/0/5] port link-mode route

[DeviceB-GigabitEthernet1/0/5] ip address 1.1.1.2 24

[DeviceB-GigabitEthernet1/0/5] quit

# Exclude the interface used for DR keepalive detection (GigabitEthernet 1/0/5) from the shutdown action by DRNI MAD.

[DeviceB] drni mad exclude interface gigabitethernet 1/0/5

# Create Layer 2 dynamic aggregate interface Bridge-Aggregation 125, and specify it as the IPP.

[DeviceB] interface bridge-aggregation 125

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

[DeviceB-Bridge-Aggregation125] port drni intra-portal-port 1

[DeviceB-Bridge-Aggregation125] quit

# Assign GigabitEthernet 1/0/3 and GigabitEthernet 1/0/4 to aggregation group 125.

[DeviceB] interface gigabitethernet 1/0/3

[DeviceB-GigabitEthernet1/0/3] port link-aggregation group 125

[DeviceB-GigabitEthernet1/0/3] quit

[DeviceB] interface gigabitethernet 1/0/4

[DeviceB-GigabitEthernet1/0/4] port link-aggregation group 125

[DeviceB-GigabitEthernet1/0/4] quit

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

[DeviceB] interface bridge-aggregation 100

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

[DeviceB-Bridge-Aggregation100] port drni group 1

[DeviceB-Bridge-Aggregation100] quit

# Assign GigabitEthernet 1/0/1 to aggregation group 100.

[DeviceB] interface gigabitethernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] port link-aggregation group 100

[DeviceB-GigabitEthernet1/0/1] quit

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

[DeviceB] interface bridge-aggregation 101

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

[DeviceB-Bridge-Aggregation101] port drni group 2

[DeviceB-Bridge-Aggregation101] quit

# Assign GigabitEthernet 1/0/2 to aggregation group 101.

[DeviceB] interface gigabitethernet 1/0/2

[DeviceB-GigabitEthernet1/0/2] port link-aggregation group 101

[DeviceB-GigabitEthernet1/0/2] quit

# Create VLAN 100 and VLAN 101.

[DeviceB] vlan 100

[DeviceB-vlan100] quit

[DeviceB] vlan 101

[DeviceB-vlan101] 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

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

[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

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

[DeviceB-Bridge-Aggregation101] quit

# Set the link type of Bridge-Aggregation 125 to trunk, and assign it to VLAN 100 and VLAN 101.

[DeviceB] interface bridge-aggregation 125

[DeviceB-Bridge-Aggregation125] port link-type trunk

[DeviceB-Bridge-Aggregation125] port trunk permit vlan 100 101

[DeviceB-Bridge-Aggregation125] quit

# Create VLAN-interface 100 and VLAN-interface 101, and assign IP addresses to them.

[DeviceB] interface vlan-interface 100

[DeviceB-vlan-interface100] ip address 10.1.1.2 24

[DeviceB-vlan-interface100] quit

[DeviceB] interface vlan-interface 101

[DeviceB-vlan-interface101] ip address 20.1.1.2 24

[DeviceB-vlan-interface101] quit

# Configure OSPF.

[DeviceB] ospf

[DeviceB-ospf-1] import-route direct

[DeviceB-ospf-1] area 0

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

[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] quit

[DeviceB-ospf-1] quit

# Create VRRP group 1 on VLAN-interface 100 and set its virtual IP address to 10.1.1.100.

[DeviceB] interface vlan-interface 100

[DeviceB-Vlan-interface100] vrrp vrid 1 virtual-ip 10.1.1.100

[DeviceB-Vlan-interface100] quit

# Create VRRP group 2 on VLAN-interface 101 and set its virtual IP address to 20.1.1.100.

[DeviceB] interface vlan-interface 101

[DeviceB-Vlan-interface101] vrrp vrid 2 virtual-ip 20.1.1.100

[DeviceB-Vlan-interface101] quit

3. Configure Device C:

# 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 GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 to aggregation group 100.

[DeviceC] interface range gigabitethernet 1/0/1 to gigabitethernet 1/0/2

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

[DeviceC-if-range] quit

# Create VLAN 100.

[DeviceC] vlan 100

[DeviceC-vlan100] 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

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

[DeviceC-Bridge-Aggregation100] quit

# Set the link type of GigabitEthernet 1/0/3 to trunk, and assign it to VLAN 100.

[DeviceC] interface gigabitethernet 1/0/3

[DeviceC-GigabitEthernet1/0/3] port link-type trunk

[DeviceC-GigabitEthernet1/0/3] port trunk permit vlan 100

[DeviceC-GigabitEthernet1/0/3] quit

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

[DeviceC] interface vlan-interface 100

[DeviceC-vlan-interface100] ip address 10.1.1.3 24

[DeviceC-vlan-interface100] quit

# Configure OSPF.

[DeviceC] ospf

[DeviceC-ospf-1] import-route direct

[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] quit

[DeviceC-ospf-1] quit

4. Configure Device D:

# 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 GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 to aggregation group 101.

[DeviceD] interface range gigabitethernet 1/0/1 to gigabitethernet 1/0/2

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

[DeviceD-if-range] quit

# Create VLAN 101.

[DeviceD] vlan 101

[DeviceD-vlan101] 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

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

[DeviceD-Bridge-Aggregation101] quit

# Set the link type of GigabitEthernet 1/0/3 to trunk, and assign it to VLAN 101.

[DeviceD] interface gigabitethernet 1/0/3

[DeviceD-GigabitEthernet1/0/3] port link-type trunk

[DeviceD-GigabitEthernet1/0/3] port trunk permit vlan 101

[DeviceD-GigabitEthernet1/0/3] quit

# Create VLAN-interface 101, and assign it an IP address.

[DeviceD] interface vlan-interface 101

[DeviceD-vlan-interface101] ip address 20.1.1.3 24

[DeviceD-vlan-interface101] quit

# Configure OSPF.

[DeviceD] ospf

[DeviceD-ospf-1] import-route direct

[DeviceD-ospf-1] area 0

[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] quit

[DeviceD-ospf-1] quit

Verifying the configuration

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

[DeviceC] display ospf peer

OSPF Process 1 with Router ID 10.1.1.3

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

20.1.1.1 10.1.1.1 1 37 Full/DR Vlan100

20.1.1.2 10.1.1.2 1 32 Full/BDR Vlan100

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

[DeviceD] display ospf peer

OSPF Process 1 with Router ID 20.1.1.3

Neighbor Brief Information

Area: 0.0.0.0

Router ID Address Pri Dead-Time State Interface

20.1.1.1 20.1.1.1 1 38 Full/DR Vlan101

20.1.1.2 20.1.1.2 1 37 Full/BDR Vlan101

# Verify that Host A and Host B can ping each other. (Details not shown.)

04-Layer 2 - LAN Switching Configuration Guide

DRNI overview

DRCP operating mechanism

DRCP timeout timers

MAD mechanism

Type 1 configuration

Type 2 configuration

DRNI failure handling mechanisms

DR interface failure handling mechanism

IPL failure handling mechanism

Device failure handling mechanism

Configuring the DR system MAC address

Configuration restrictions and guidelines

Configuration procedure

Setting the DR system number

Configuration restrictions and guidelines

Configuration procedure

Setting the DR system priority

Overview

Configuration restrictions and guidelines

Configuration procedure

Overview

Configuration procedure

Overview

Configuration restrictions and guidelines

Configuration procedure

Overview

Configuration restrictions and guidelines

Configuration procedure

Setting the DR keepalive interval and timeout timer

Overview

Configuration restrictions and guidelines

Configuration procedure

Configuring a DR interface

Configuration restrictions and guidelines

Configuration procedure

Specifying a Layer 2 aggregate interface as the IPP

Configuration restrictions and guidelines

Configuration procedure

Overview

Configuration restrictions and guidelines

Configuration procedure

Enabling the short DRCP timeout timer on the IPP or a DR interface

Overview

Configuration restrictions and guidelines

Configuration procedure

Setting the keepalive hold timer for identifying the cause of IPL down events

Overview

Configuration restrictions and guidelines

Configuration procedure

Configuring DR system auto-recovery

Overview

Configuration restrictions and guidelines

Configuration procedure

Setting the data restoration interval

Overview

Configuration restrictions and guidelines

Configuration procedure

Displaying and maintaining DRNI

Network requirements

Configuration procedure

Verifying the configuration

Network requirements

Configuration procedure

Verifying the configuration

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