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CloudEngine 12800 and 12800E V200R005C10 Configuration Guide - IP Unicast Routing

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.

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Example for Configuring OSPF IP FRR

Example for Configuring OSPF IP FRR

Networking Requirements

When a fault occurs on the primary link T, traffic is switched to a backup link. In such a scenario, two problems arise:
  • It takes hundreds of milliseconds for the traffic to be switched to a backup link during OSPF fault restoration, which leads to service interruption.
  • Traffic may be switched to a link passing through Switch A, but Switch A is an ASBR and is not expected to function as a backup device.

When a fault occurs on the network, OSPF IP FRR can fast switch traffic to a backup link without waiting for route convergence. This ensures uninterrupted traffic transmission. In addition, you can also configure Switch A (ASBR) to detour around the backup link.

As shown in Figure 5-36:
  • All switches run OSPF.
  • Link costs meet the OSPF IP FRR traffic protection inequality.

  • When the primary link T fails, Switch S immediately switches traffic to the backup link. The traffic is forwarded through Switch N.

  • Based on the network plan, the link where Switch A resides does not function as an FRR backup link.
Figure 5-36 Networking diagram for configuring OSPF IP FRR

Table 5-23 Data preparation

Switch

Router ID

Interface

VLANIF Interface

IP Address

Switch S

10.10.10.1

10GE1/0/1

VLANIF 10

10.1.1.1/24

10GE1/0/2

VLANIF 20

10.1.2.1/24

10GE1/0/3

VLANIF 30

10.1.3.1/24

Switch A

10.10.10.2

10GE1/0/1

VLANIF 10

10.1.1.2/24

10GE1/0/2

VLANIF 40

10.20.1.2/24

Switch N

10.10.10.3

10GE1/0/1

VLANIF 30

10.1.3.2/24

10GE1/0/2

VLANIF 60

10.20.3.2/24

Switch E

10.10.10.4

10GE1/0/1

VLANIF 40

10.20.1.1/24

10GE1/0/2

VLANIF 20

10.1.2.2/24

10GE1/0/3

VLANIF 60

10.20.3.1/24

10GE1/0/4

VLANIF 70

172.17.1.1/24

Configuration Notes

When configuring OSPF IP FRR, note that:

Before configuring OSPF IP FRR, if an interface is expected not to be an interface of a back link, you need to block FRR on the interface.

During the configuration of OSPF IP FRR, the lower layer needs to fast respond to a link change so that traffic can be rapidly switched to the backup link. After the bfd all-interfaces frr-binding command is run, the BFD session status is associated with the link status of an interface (when the BFD session goes Down, the link status of the interface becomes Down) so that link faults can be rapidly detected.

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure basic OSPF functions on each switch.

  2. Configure BFD for OSPF on all devices in Area 0.

  3. Set the costs of links to ensure that link T is preferred to transmit traffic.

  4. Block FRR on a specified interface of Switch S.

  5. Enable OSPF IP FRR on Switch S to protect the traffic forwarded by Switch S.

Procedure

  1. Assign an IP address to each interface. The configuration details are not provided here.
  2. Configure basic OSPF functions. For details, see Example for Configuring Basic OSPF Functions.
  3. Configure BFD for OSPF on all devices in Area 0. For details, see Example for Configuring BFD for OSPF.
  4. Set the costs of links to ensure that link T is preferred to transmit traffic.

    # Configure Switch S.

    [~SwitchS] interface vlanif 10
    [*SwitchS-Vlanif10] ospf cost 10
    [*SwitchS-Vlanif10] quit
    [*SwitchS] interface vlanif 20
    [*SwitchS-Vlanif20] ospf cost 15
    [*SwitchS-Vlanif20] quit
    [*SwitchS] interface vlanif 30
    [*SwitchS-Vlanif30] ospf cost 10
    [*SwitchS-Vlanif30] quit
    [*SwitchS] commit

    # Configure Switch A.

    [~SwitchA] interface vlanif 40
    [*SwitchA-Vlanif40] ospf cost 15
    [*SwitchA-Vlanif40] quit
    [*SwitchA] interface vlanif 10
    [*SwitchA-Vlanif10] ospf cost 10
    [*SwitchA-Vlanif10] quit
    [*SwitchA] commit

    # Configure Switch N.

    [~SwitchN] interface vlanif 30
    [*SwitchN-Vlanif30] ospf cost 10
    [*SwitchN-Vlanif30] quit
    [*SwitchN] interface vlanif 60
    [*SwitchN-Vlanif60] ospf cost 10
    [*SwitchN-Vlanif60] quit
    [*SwitchN] commit

    # Configure Switch E.

    [~SwitchE] interface vlanif 20
    [*SwitchE-Vlanif20] ospf cost 15
    [*SwitchE-Vlanif20] quit
    [*SwitchE] interface vlanif 40
    [*SwitchE-Vlanif30] ospf cost 15
    [*SwitchE-Vlanif30] quit
    [*SwitchE] interface vlanif 60
    [*SwitchE-Vlanif40] ospf cost 10
    [*SwitchE-Vlanif40] quit
    [*SwitchE] interface vlanif 70
    [*SwitchE-Vlanif70] ospf cost 5
    [*SwitchE-Vlanif70] quit
    [*SwitchE] commit

  5. Block FRR on a specified interface of Switch S.

    [~SwitchS] interface vlanif 10
    [~SwitchS-Vlanif10] ospf frr block
    [*SwitchS-Vlanif10] quit
    [*SwitchS] commit

  6. Enable OSPF IP FRR on Switch S.

    [~SwitchS] ospf
[*SwitchS-ospf-1] frr
[*SwitchS-ospf-1-frr] loop-free-alternate
[*SwitchS-ospf-1-frr] commit

  7. Verify the configuration.

    # Run the display ospf routing router-id command on Switch S to view routing information.

    [~SwitchS-ospf-1-frr] display ospf routing 172.17.1.1
    Flags: A - Added to URT, S - Secondary route 

          OSPF Process 1 with Router ID 10.10.10.1

 Destination    : 10.10.10.4/32                                                                                                  
 AdverRouter    : 10.10.10.4                  Area       : 0.0.0.0                                                               
 Cost           : 3                        Type       : Stub                                                                     
 NextHop        : 10.1.2.2                 Interface  : Vlanif20                                                                 
 Priority       : Low                                                                                                            
 Backup NextHop : 10.1.3.2                 Backup Interface : Vlanif30                                                           
 Backup Type    : LFA LINK-NODE                                                                                                  
 Flags          : A/-

    The preceding display shows that a backup route is generated on Switch S.

Configuration Files

  • Configuration file of Switch S

    #
     sysname SwitchS
#
vlan batch 10 20 30
#
 bfd
#
interface Vlanif10
 ip address 10.1.1.1 255.255.255.0
 ospf cost 10
 ospf frr block
#
interface Vlanif20
 ip address 10.1.2.1 255.255.255.0
 ospf cost 15
#
interface Vlanif30
 ip address 10.1.3.1 255.255.255.0
 ospf cost 10
#
interface 10GE1/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface 10GE1/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
#
interface 10GE1/0/3
 port link-type trunk
 port trunk allow-pass vlan 30
#
ospf 1 router-id 10.10.10.1
 bfd all-interfaces enable
 bfd all-interfaces frr-binding
 frr
  loop-free-alternate
 area 0.0.0.0
  network 10.1.1.0 0.0.0.255
  network 10.1.2.0 0.0.0.255
  network 10.1.3.0 0.0.0.255
#
return

  • Configuration file of Switch A

    #
 sysname SwitchA
#
vlan batch 10 40
#  
 bfd
#
interface Vlanif10
 ip address 10.1.1.2 255.255.255.0
 ospf cost 10
#
interface Vlanif40
 ip address 20.1.1.2 255.255.255.0
 ospf cost 15
#
interface 10GE1/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface 10GE1/0/2
 port link-type trunk
 port trunk allow-pass vlan 40
#
ospf 1 router-id 10.10.10.2
 bfd all-interfaces enable
 bfd all-interfaces frr-binding
 area 0.0.0.0
  network 10.1.1.0 0.0.0.255
  network 20.1.1.0 0.0.0.255
#
return

  • Configuration file of Switch N

    #
 sysname SwitchN
#
vlan batch 30 60
#
 bfd
#
interface Vlanif30
 ip address 10.1.3.2 255.255.255.0
 ospf cost 10
#
interface Vlanif60
 ip address 20.1.3.2 255.255.255.0
 ospf cost 10
#
interface 10GE1/0/1
 port link-type trunk
 port trunk allow-pass vlan 30
#
interface 10GE1/0/2
 port link-type trunk
 port trunk allow-pass vlan 60
#
ospf 1 router-id 10.10.10.3
 bfd all-interfaces enable
 bfd all-interfaces frr-binding
 area 0.0.0.0
  network 10.1.3.0 0.0.0.255
  network 20.1.3.0 0.0.0.255
#
return

  • Configuration file of Switch E

    #
 sysname SwitchE
#
vlan batch 20 40 60 70
#
 bfd
#
interface Vlanif20
 ip address 10.1.2.2 255.255.255.0
 ospf cost 15
 #
interface Vlanif40
 ip address 20.1.1.1 255.255.255.0
 ospf cost 15
#
interface Vlanif60
 ip address 20.1.3.1 255.255.255.0
 ospf cost 10
#
interface Vlanif70
 ip address 172.17.1.1 255.255.255.0
 ospf cost 5
#
interface 10GE1/0/1
 port link-type trunk
 port trunk allow-pass vlan 40
#
interface 10GE1/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
#
interface 10GE1/0/3
 port link-type trunk
 port trunk allow-pass vlan 60
#
interface 10GE1/0/4
 port link-type trunk
 port trunk allow-pass vlan 70
#
ospf 1 router-id 10.10.10.4
 bfd all-interfaces enable
 bfd all-interfaces frr-binding
 area 0.0.0.0
  network 10.1.2.0 0.0.0.255
  network 20.1.1.0 0.0.0.255
  network 20.1.3.0 0.0.0.255
  network 172.17.1.0 0.0.0.255
#
return
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Updated: 2021-09-17

Document ID: EDOC1100075354

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