H3C Routers

POS Interface Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contents

Introduction· 1

Prerequisites· 1

Example: Using optical fibers to directly connect PPP-enabled POS interfaces  1

Network configuration· 1

Analysis· 2

Software versions used· 2

Restrictions and guidelines· 2

Procedures· 2

Configuring Router A· 2

Configuring Router B· 3

Configuring Router C· 3

Verifying the configuration· 4

Configuration files· 5

Example: Using optical fibers to directly connect HDLC-enabled POS interfaces  6

Network configuration· 6

Software versions used· 6

Restrictions and guidelines· 6

Procedures· 7

Configuring Router A· 7

Configuring Router B· 7

Verifying the configuration· 8

Configuration files· 8

Related documentation· 9

 

Introduction

The following information provides packet over SONET (POS) interface configuration examples.

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 POS, Synchronous Digital Hierarchy (SDH), Synchronous Optical Network (SONET), Point-to-Point Protocol (PPP), and High-Level Data Link Control (HDLC).

Example: Using optical fibers to directly connect PPP-enabled POS interfaces

Network configuration

Use a pair of single-mode fibers (one Tx and one Rx) to directly connect the POS interfaces of Router A and Router B, Router A and Router C, and Router B and Router C through PPP. Each device uses the Open Shortest Path First (OSPF) protocol to connect to the other two devices. Configure the network to meet the following requirements:

·     When the link between Router A and Router B is intact, the traffic forwarding path from Router A to Router B is Router A -> Router B.

·     When Router A receives the multiplexer section remote defect indication (MS-RDI) signals from the peer Router B and the MS-RDI signals continue for 100ms, the physical state of the interface will be automatically set to down.

·     When interface POS 2/1/1 on Router A is down, the traffic forwarding path from Router A to Router B is Router A—>Router C—>Router B.

Figure 1 Network diagram

 

Analysis

·     To automatically set the physical state of the interface to down upon receiving an MS-RDI signal from the peer, configure the action to take when alarms are received on the current interface. An RDI alarm occurs if the device receives MS-RDI signals from the remote end.

·     To ensure that the POS interface is shut down if the MS-RDI signal persists for 100ms rather than immediately upon receiving an MS-RDI signal from the peer, configure the physical state change suppression interval as 100ms on the POS interface.

Software versions used

This configuration example was created and verified on R9141P16 of the MSR5680-X3 device.

Restrictions and guidelines

When the POS interfaces of two routers are directly connected, configure one end to use the master clock mode and the other end to use the slave clock mode.

Procedures

Configuring Router A

1.     Configure interfaces on Router A:

# Assign an IP address to interface POS 2/1/1 and enable PPP encapsulation on the interface.

<RouterA> system-view

[RouterA] interface pos 2/1/1

[RouterA-Pos2/1/1] ip address 10.110.1.10 255.255.255.0

[RouterA-Pos2/1/1] link-protocol ppp

# Set the clock mode to master on interface POS 2/1/1.

[RouterA-Pos2/1/1] clock master

# Configure POS 2/1/1 to go down when an RDI alarm occurs.

[RouterA-Pos2/1/1] alarm-detect rdi action link-down

# Set the physical state change suppression interval to 100 milliseconds. Then, the interface state can change to up or down 100 milliseconds after the POS interface comes up or goes down.

[RouterA-Pos2/1/1] link-delay msec 100

[RouterA-Pos2/1/1] quit

# Assign an IP address to interface POS 2/1/2 and enable PPP encapsulation on the interface.

[RouterA] interface pos 2/1/2

[RouterA-Pos2/1/2] ip address 10.110.2.10 255.255.255.0

[RouterA-Pos2/1/2] link-protocol ppp

# Set the clock mode to master on interface POS 2/1/2.

[RouterA-Pos2/1/2] clock master

[RouterA-Pos2/1/2] quit

2.     Configure OSPF.

[RouterA] ospf

[RouterA-ospf-1] area 0

[RouterA-ospf-1-area-0.0.0.0] network 10.110.1.0 0.0.0.255

[RouterA-ospf-1-area-0.0.0.0] network 10.110.2.0 0.0.0.255

[RouterA-ospf-1-area-0.0.0.0] network 1.1.1.1 0.0.0.0

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

[RouterA-ospf-1] quit

Configuring Router B

1.     Configure interfaces on Router B:

# Assign an IP address to interface POS 2/1/1 and enable PPP encapsulation on the interface. Use the default clock mode (slave) on the interface.

<RouterB> system-view

[RouterB] interface pos 2/1/1

[RouterB-Pos2/1/1] ip address 10.110.1.11 255.255.255.0

[RouterB-Pos2/1/1] link-protocol ppp

[RouterB-Pos2/1/1] quit

# Assign an IP address to interface POS 2/1/2 and enable PPP encapsulation on the interface. Use the default clock mode (slave) on the interface.

[RouterB] interface pos 2/1/2

[RouterB-Pos2/1/2] ip address 10.110.3.10 255.255.255.0

[RouterB-Pos2/1/2] link-protocol ppp

[RouterB-Pos2/1/2] quit

2.     Configure OSPF.

[RouterB] ospf

[RouterB-ospf-1] area 0

[RouterB-ospf-1-area-0.0.0.0] network 10.110.1.0 0.0.0.255

[RouterB-ospf-1-area-0.0.0.0] network 10.110.3.0 0.0.0.255

[RouterB-ospf-1-area-0.0.0.0] network 2.2.2.2 0.0.0.0

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

[RouterB-ospf-1] quit

Configuring Router C

1.     Configure interfaces on Router C:

# Assign an IP address to interface POS 2/1/1 and enable PPP encapsulation on the interface. Use the default clock mode (slave) on the interface.

<RouterC> system-view

[RouterC] interface pos 2/1/1

[RouterC-Pos2/1/1] ip address 10.110.2.11 255.255.255.0

[RouterC-Pos2/1/1] link-protocol ppp

[RouterC-Pos2/1/1] quit

# Assign an IP address to interface POS 2/1/1 and enable PPP encapsulation on the interface.

[RouterC] interface pos 2/1/2

[RouterC-Pos2/1/2] ip address 10.110.3.11 255.255.255.0

[RouterC-Pos2/1/2] link-protocol ppp

# Set the clock mode to master on interface POS 2/1/2.

[RouterC-Pos2/1/2] clock master

[RouterC-Pos2/1/2] quit

2.     Configure OSPF.

[RouterC] ospf

[RouterC-ospf-1] area 0

[RouterC-ospf-1-area-0.0.0.0] network 10.110.2.0 0.0.0.255

[RouterC-ospf-1-area-0.0.0.0] network 10.110.3.0 0.0.0.255

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

[RouterC-ospf-1] quit

Verifying the configuration

# After completing the preceding configuration, check the route information for IP address 2.2.2.2/32 on Router A. Verify that Router A communicates with Router B through a direct link.

<RouterA> display ip routing-table 2.2.2.2 verbose

 

Summary Count : 1

 

Destination: 2.2.2.2/32

   Protocol: OSPF             Process ID: 1

  SubProtID: 0x1                     Age: 04h20m37s

       Cost: 1                Preference: 10

      IpPre: N/A              QosLocalID: N/A

        Tag: 0                     State: Active Adv

  OrigTblID: 0x0                 OrigVrf: default-vrf

    TableID: 0x2                  OrigAs: 0

      NBRID: 0x26000002           LastAs: 0

     AttrID: 0xffffffff         Neighbor: 0.0.0.0

      Flags: 0x1008c         OrigNextHop: 10.110.1.11

      Label: NULL            RealNextHop: 10.110.1.11

    BkLabel: NULL              BkNextHop: N/A

  Tunnel ID: Invalid           Interface: Pos2/1/1

BkTunnel ID: Invalid         BkInterface: N/A

   FtnIndex: 0x0            TrafficIndex: N/A

  Connector: N/A

# Configure interface POS 2/1/1 on Router A to go down when it continuously receives RDI alarms for 100 milliseconds.

<RouterA> display interface pos 2/1/1 brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface            Link   Protocol    Primary IP         Description

Pos2/1/1             DOWN   DOWN        --

# When interface POS 2/1/1 on Router A is down, check the route information for IP address 2.2.2.2/32. Verify that Router A and Router B have switched to communicate through Router C.

<RouterA> display ip routing-table 2.2.2.2 verbose

 

Summary Count : 1

 

Destination: 2.2.2.2/32

   Protocol: OSPF             Process ID: 1

  SubProtID: 0x1                     Age: 04h20m37s

       Cost: 2                Preference: 10

      IpPre: N/A              QosLocalID: N/A

        Tag: 0                     State: Active Adv

  OrigTblID: 0x0                 OrigVrf: default-vrf

    TableID: 0x2                  OrigAs: 0

      NBRID: 0x26000002           LastAs: 0

     AttrID: 0xffffffff         Neighbor: 0.0.0.0

      Flags: 0x1008c         OrigNextHop: 10.110.2.11

      Label: NULL            RealNextHop: 10.110.2.11

    BkLabel: NULL              BkNextHop: N/A

  Tunnel ID: Invalid           Interface: Pos2/1/2

BkTunnel ID: Invalid         BkInterface: N/A

   FtnIndex: 0x0            TrafficIndex: N/A

  Connector: N/A

Configuration files

·     Router A:

#

interface Pos2/1/1

 link-protocol ppp

 clock master

 ip address 10.110.1.10 255.255.255.0

 alarm-detect rdi action link-down

 link-delay msec 100

#

interface Pos2/1/2

 link-protocol ppp

 clock master

 ip address 10.110.1.10 255.255.255.0

#

ospf 1

 area 0.0.0.0

  network 10.110.1.0 0.0.0.255

  network 10.110.2.0 0.0.0.255

  network 1.1.1.1 0.0.0.0

#

·     Router B:

#

interface Pos2/1/1

 link-protocol ppp

 ip address 10.110.1.11 255.255.255.0

#

interface Pos2/1/2

 link-protocol ppp

 ip address 10.110.3.10 255.255.255.0

#

ospf 1

 area 0.0.0.0

  network 10.110.1.0 0.0.0.255

  network 10.110.3.0 0.0.0.255

  network 2.2.2.2 0.0.0.0

#

·     Router C:

#

interface Pos2/1/1

 link-protocol ppp

ip address 10.110.1.10 255.255.255.0

#

interface Pos2/1/2

 link-protocol ppp

clock master

 ip address 10.110.1.10 255.255.255.0

#

ospf 1

 area 0.0.0.0

  network 10.110.2.0 0.0.0.255

  network 10.110.3.0 0.0.0.255

#

Example: Using optical fibers to directly connect HDLC-enabled POS interfaces

Network configuration

To increase bandwidth and enhance connection reliability between Router A and Router B, create an HDLC link bundle.

Figure 2 Network diagram

 

Software versions used

This configuration example was created and verified on R9141P16 of the MSR5680-X3 device.

Restrictions and guidelines

·     Only physical POS interfaces can be assigned to an HDLC bundle.

·     An interface can be the member of only one HDLC link bundle. To move an interface from one HDLC link bundle to another, remove the interface from the current HDLC link bundle first.

·     You must enable HDLC encapsulation on an interface to be assigned to an HDLC link bundle. You cannot change the link layer protocol encapsulation of an HDLC link bundle member interface.

·     When the POS interfaces of two routers are directly connected, configure one end to use the master clock mode and the other end to use the slave clock mode.

Procedures

Configuring Router A

# Create HDLC link bundle interface 1 and assign an IP address to it.

<RouterA> system-view

[RouterA] interface hdlc-bundle 1

[RouterA-HDLC-bundle1] ip address 1.1.1.1 24

[RouterA-HDLC-bundle1] quit

# Set the clock mode to master and enable HDLC encapsulation on interface POS 2/1/1.

[RouterA] interface pos 2/1/1

[RouterA-Pos2/1/1] clock master

[RouterA-Pos2/1/1] link-protocol hdlc

# Assign interface POS 2/1/1 to HDLC link bundle 1.

[RouterA-Pos2/1/1] bundle id 1

[RouterA-Pos2/1/1] quit

# Set the clock mode to master and enable HDLC encapsulation on interface POS 2/1/2.

[RouterA] interface pos 2/1/2

[RouterA-Pos2/1/2] clock master

[RouterA-Pos2/1/2] link-protocol hdlc

# Assign interface POS 2/1/2 to HDLC link bundle 1.

[RouterA-Pos2/1/2] bundle id 1

[RouterA-Pos2/1/2] quit

Configuring Router B

# Create HDLC link bundle interface 1 and assign an IP address to it.

<RouterB> system-view

[RouterB] interface hdlc-bundle 1

[RouterB-HDLC-bundle1] ip address 1.1.1.2 24

[RouterB-HDLC-bundle1] quit

# Enable HDLC encapsulation on interface POS 2/1/1. Use the default clock mode (slave) on the interface.

[RouterB] interface pos 2/1/1

[RouterB-Pos2/1/1] link-protocol hdlc

# Assign interface POS 2/1/1 to HDLC link bundle 1.

[RouterB-Pos2/1/1] bundle id 1

[RouterB-Pos2/1/1] quit

# Enable HDLC encapsulation on interface POS 2/1/2. Use the default clock mode (slave) on the interface.

[RouterB] interface pos 2/1/2

[RouterB-Pos2/1/2] link-protocol hdlc

# Assign interface POS 2/1/2 to HDLC link bundle 1.

[RouterB-Pos2/1/2] bundle id 1

[RouterB-Pos2/1/2] quit

Verifying the configuration

# Verify that the HDLC link bundle interfaces on Router A and Router B can ping each other.

[RouterA] ping –a 1.1.1.1 1.1.1.2

Ping 1.1.1.2 (1.1.1.2) from 1.1.1.1: 56 data bytes, press CTRL_C to break

56 bytes from 1.1.1.2: icmp_seq=0 ttl=255 time=0.000 ms

56 bytes from 1.1.1.2: icmp_seq=1 ttl=255 time=0.000 ms

56 bytes from 1.1.1.2: icmp_seq=2 ttl=255 time=0.000 ms

56 bytes from 1.1.1.2: icmp_seq=3 ttl=255 time=0.000 ms

56 bytes from 1.1.1.2: icmp_seq=4 ttl=255 time=0.000 ms

 

--- Ping statistics for 1.1.1.2 ---

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss

round-trip min/avg/max/std-dev = 0.000/0.000/0.000/0.000 ms

# Execute the display bundle hdlc-bundle command on Router A or Router B to view the bundle information for HDLC link bundle interface 1. Use Router A as an example.

[RouterA] display bundle hdlc-bundle 1 slot 2

Bundle: HDLC-bundle1, slot 2

  Selected members: 2, Total bandwidth: 1244160 kbps

  Member              State               Bandwidth(kbps)     Priority

  Pos2/1/1            Selected            622080              32768

  Pos2/1/2            Selected            622080              32768

The output indicates that:

·     Both POS 2/1/1 and POS 2/1/2 are Selected for load sharing.

·     The bandwidth of the HDLC link bundle is 1244160 kbps, which is the sum of the bandwidths of the two POS interfaces.

·     If one POS interface fails (for example, POS 2/1/1 of Router A is down), traffic can be transmitted through the other POS interface, enhancing link reliability.

Configuration files

·     Router A:

#

interface pos 2/1/1

 link-protocol hdlc

 clock master

 bundle id 1

#

interface pos 2/1/2

 link-protocol hdlc

 clock master

 bundle id 1

#

interface hdlc-bundle 1

 ip address 1.1.1.1 24

#

·     Router B:

#

interface pos 2/1/1

 link-protocol hdlc

 bundle id 1

#

interface pos 2/1/2

 link-protocol hdlc

 bundle id 1

#

interface hdlc-bundle 1

 ip address 1.1.1.2 24

#

Related documentation

·     H3C MSR5680-X3 Router Configuration Guides (V9)

·     H3C MSR5680-X3 Router Command References (V9)