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Example for Configuring Association Between BFD Sessions
Networking Requirements
As shown in Figure 2-25, CE1 is dual-homed to PE1 and PE2, and CE2 is dual-homed to PE3 and PE4. Traffic is forwarded through the primary path CE1 -> PE1 -> PE3 -> CE2. It is required that CEs fast detect faults and switch traffic to the standby path when faults occur on links between PEs.
Configuration Roadmap
The configuration roadmap is as follows:
Create BFD sessions between CE1 and PE1, between PE1 and PE3, and between PE3 and CE2.
On PE1, configure bidirectional transmission of fault messages between CE1 and PE1 and between PE1 and PE3.
On PE3, configure bidirectional transmission of fault messages between PE1 and PE3 and between PE3 and CE2.
Procedure
- Configure devices to ensure network connectivity.
# Assign an IP address to each interface. PE1 is used as an example. The configurations of PE2, PE3, PE4, CE1 and CE2are similar to the configuration of PE1, and are not mentioned here.
<Quidway> system-view [Quidway] sysname PE1 [PE1] vlan batch 10 20 [PE1] interface gigabitethernet 1/0/1 [PE1-GigabitEthernet1/0/1] port link-type hybrid [PE1-GigabitEthernet1/0/1] port hybrid pvid vlan 10 [PE1-GigabitEthernet1/0/1] port hybrid untagged vlan 10 [PE1-GigabitEthernet1/0/1] quit [PE1] interface gigabitethernet 1/0/2 [PE1-GigabitEthernet1/0/2] port link-type hybrid [PE1-GigabitEthernet1/0/2] port hybrid pvid vlan 20 [PE1-GigabitEthernet1/0/2] port hybrid untagged vlan 20 [PE1-GigabitEthernet1/0/2] quit [PE1] interface vlanif 10 [PE1-Vlanif10] ip address 10.10.1.2 24 [PE1-Vlanif10] quit [PE1] interface vlanif 20 [PE1-Vlanif20] ip address 10.20.1.1 24 [PE1-Vlanif20] quit
- Configure a routing protocol.
OSPF is used in this example.
Run OSPF on CEs and PEs. To ensure that traffic is transmitted through the path CE1 -> PE1 -> PE3 -> CE2, increase the OSPF cost of VLANIF 40 on CE1 and VLANIF 60 on CE2. For example, change the cost to 10.
# Configure PE1. The configurations of PE2, PE3, and PE4 are similar to that of PE1, and are not mentioned here.
[PE1] ospf 1 [PE1-ospf-1] area 0.0.0.0 [PE1-ospf-1-area-0.0.0.0] network 10.10.1.0 0.0.0.255 [PE1-ospf-1-area-0.0.0.0] network 10.20.1.0 0.0.0.255 [PE1-ospf-1-area-0.0.0.0] quit [PE1-ospf-1] quit
# Configure CE1.
[CE1] ospf 1 [CE1-ospf-1] area 0.0.0.0 [CE1-ospf-1-area-0.0.0.0] network 10.10.1.0 0.0.0.255 [CE1-ospf-1-area-0.0.0.0] network 10.40.1.0 0.0.0.255 [CE1-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255 [CE1-ospf-1-area-0.0.0.0] quit [CE1-ospf-1] quit [CE1] interface vlanif 40 [CE1-Vlanif40] ospf cost 10 [CE1-Vlanif40] quit
# Configure CE2.
[CE2] ospf 1 [CE2-ospf-1] area 0.0.0.0 [CE2-ospf-1-area-0.0.0.0] network 10.30.1.0 0.0.0.255 [CE2-ospf-1-area-0.0.0.0] network 10.60.1.0 0.0.0.255 [CE2-ospf-1-area-0.0.0.0] network 192.168.2.0 0.0.0.255 [CE2-ospf-1-area-0.0.0.0] quit [CE2-ospf-1] quit [CE2] interface vlanif 60 [CE2-Vlanif60] ospf cost 10 [CE2-Vlanif60] quit
# Run the display ip routing-table command on CE1. You can see that the outbound interface for the route from CE1 to 192.168.2.0/24 is VLANIF 10, indicating that traffic is transmitted along the primary path.
[CE1] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 13 Routes : 13 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.10.1.0/24 Direct 0 0 D 10.10.1.1 Vlanif10 10.10.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif10 10.20.1.0/24 OSPF 10 2 D 10.10.1.2 Vlanif10 10.30.1.0/24 OSPF 10 3 D 10.10.1.2 Vlanif10 10.40.1.0/24 Direct 0 0 D 10.40.1.1 Vlanif40 10.40.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif40 10.50.1.0/24 OSPF 10 11 D 10.40.1.2 Vlanif40 10.60.1.0/24 OSPF 10 12 D 10.40.1.2 Vlanif40 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 192.168.1.0/24 Direct 0 0 D 192.168.1.1 Vlanif100 192.168.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif100 192.168.2.0/24 OSPF 10 4 D 10.10.1.2 Vlanif10 - Create BFD sessions.
# Configure CE1.
[CE1] bfd [CE1-bfd] quit [CE1] bfd ce1tope1 bind peer-ip 10.10.1.2 interface vlanif 10 [CE1-bfd-session-ce1tope1] discriminator local 10 [CE1-bfd-session-ce1tope1] discriminator remote 11 [CE1-bfd-session-ce1tope1] commit [CE1-bfd-session-ce1tope1] quit
# Configure PE1.
[PE1] bfd [PE1-bfd] quit [PE1] bfd pe1toce1 bind peer-ip 10.10.1.1 interface vlanif 10 [PE1-bfd-session-pe1toce1] discriminator local 11 [PE1-bfd-session-pe1toce1] discriminator remote 10 [PE1-bfd-session-pe1toce1] commit [PE1-bfd-session-pe1toce1] quit [PE1] bfd pe1tope3 bind peer-ip 10.20.1.2 interface vlanif 20 [PE1-bfd-session-pe1tope3] discriminator local 13 [PE1-bfd-session-pe1tope3] discriminator remote 31 [PE1-bfd-session-pe1tope3] commit [PE1-bfd-session-pe1tope3] quit
# Configure PE3.
[PE3] bfd [PE3-bfd] quit [PE3] bfd pe3toce2 bind peer-ip 10.30.1.2 interface vlanif 30 [PE3-bfd-session-pe3toce2] discriminator local 32 [PE3-bfd-session-pe3toce2] discriminator remote 23 [PE3-bfd-session-pe3toce2] commit [PE3-bfd-session-pe3toce2] quit [PE3] bfd pe3tope1 bind peer-ip 10.20.1.1 interface vlanif 20 [PE3-bfd-session-pe3tope1] discriminator local 31 [PE3-bfd-session-pe3tope1] discriminator remote 13 [PE3-bfd-session-pe3tope1] commit [PE3-bfd-session-pe3tope1] quit
# Configure CE2.
[CE2] bfd [CE2-bfd] quit [CE2] bfd ce2tope3 bind peer-ip 10.30.1.1 interface vlanif 30 [CE2-bfd-session-ce2tope3] discriminator local 23 [CE2-bfd-session-ce2tope3] discriminator remote 32 [CE2-bfd-session-ce2tope3] commit [CE2-bfd-session-ce2tope3] quit
# After the configuration is completed, run the display bfd session all command on PEs and CEs. You can see that the status of the BFD sessions is Up. The command output on PE1 is used as an example.
[PE1] display bfd session all -------------------------------------------------------------------------------- Local Remote PeerIpAddr State Type InterfaceName -------------------------------------------------------------------------------- 11 10 10.10.1.1 Up S_IP_IF Vlanif10 13 31 10.20.1.2 Up S_IP_IF Vlanif20 -------------------------------------------------------------------------------- Total UP/DOWN Session Number : 2/0 - Configure association between BFD sessions.
Associate BFD sessions on PE1 and PE3.
# Configure PE1.
[PE1] oam-mgr [PE1-oam-mgr] oam-bind bfd-session 11 bfd-session 13 [PE1-oam-mgr] quit
# Configure PE3.
[PE3] oam-mgr [PE3-oam-mgr] oam-bind bfd-session 31 bfd-session 32 [PE3-oam-mgr] quit
- Verify the configuration.
Run the shutdown command on GE1/0/2 of PE1 to simulate a link fault.
[PE1] interface gigabitethernet 1/0/2 [PE1-GigabitEthernet1/0/2] shutdown [PE1-GigabitEthernet1/0/2] quit
Run the display bfd session all command on PE1 or PE3 to check the BFD session status. The command output on PE1 is used as an example.
[PE1] display bfd session all -------------------------------------------------------------------------------- Local Remote PeerIpAddr State Type InterfaceName -------------------------------------------------------------------------------- 11 10 10.10.1.1 Up S_IP_IF Vlanif10 13 31 10.20.1.2 Down S_IP_IF Vlanif20 -------------------------------------------------------------------------------- Total UP/DOWN Session Number : 1/1# Run the display bfd session all verbose command on CE1 or CE3. You can see that the BFD session status is Reverse Concatenated Path Down. The command output on CE1 is used as an example.
[CE1]display bfd session all verbose -------------------------------------------------------------------------------- Session MIndex : 4096 (One Hop) State : Up Name : ce1tope1 -------------------------------------------------------------------------------- Local Discriminator : 10 Remote Discriminator : 11 Session Detect Mode : Asynchronous Mode Without Echo Function BFD Bind Type : Interface(Vlanif10) Bind Session Type : Static Bind Peer IP Address : 10.10.1.2 NextHop Ip Address : 10.10.1.2 Bind Interface : Vlanif10 FSM Board Id : 0 TOS-EXP : 7 Min Tx Interval (ms) : 1000 Min Rx Interval (ms) : 1000 Actual Tx Interval (ms): 1000 Actual Rx Interval (ms): 1000 Local Detect Multi : 3 Detect Interval (ms) : 3000 Echo Passive : Disable Acl Number : - Destination Port : 3784 TTL : 255 Proc Interface Status : Disable Process PST : Disable WTR Interval (ms) : - Active Multi : 3 DSCP : - Last Local Diagnostic : Reverse Concatenated Path Down Bind Application : No Application Bind Session TX TmrID : - Session Detect TmrID : - Session Init TmrID : - Session WTR TmrID : - Session Echo Tx TmrID : - PDT Index : FSM-0 | RCV-0 | IF-0 | TOKEN-0 Session Description : - -------------------------------------------------------------------------------- Total UP/DOWN Session Number : 1/0# Run the display ip routing table command on CE1 to check the route from CE1 to CE2. The next hop of 192.168.2.0/24 is 10.40.1.2. That is, the traffic is forwarded through the standby path.
[CE1] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 12 Routes : 12 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.10.1.0/24 Direct 0 0 D 10.10.1.1 Vlanif10 10.10.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif10 10.30.1.0/24 OSPF 10 13 D 10.40.1.2 Vlanif40 10.40.1.0/24 Direct 0 0 D 10.40.1.1 Vlanif40 10.40.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif40 10.50.1.0/24 OSPF 10 11 D 10.40.1.2 Vlanif40 10.60.1.0/24 OSPF 10 12 D 10.40.1.2 Vlanif40 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 192.168.1.0/24 Direct 0 0 D 192.168.1.1 Vlanif100 192.168.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif100 192.168.2.0/24 OSPF 10 13 D 10.40.1.2 Vlanif40
Configuration Files
CE1 configuration file
# sysname CE1 # vlan batch 10 40 100 # bfd # interface Vlanif10 ip address 10.10.1.1 255.255.255.0 # interface Vlanif40 ip address 10.40.1.1 255.255.255.0 ospf cost 10 # interface Vlanif100 ip address 192.168.1.1 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 10 port hybrid untagged vlan 10 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 40 port hybrid untagged vlan 40 # interface GigabitEthernet1/0/3 port hybrid pvid vlan 100 port hybrid untagged vlan 100 # bfd ce1tope1 bind peer-ip 10.10.1.2 interface Vlanif10 discriminator local 10 discriminator remote 11 commit # ospf 1 area 0.0.0.0 network 10.10.1.0 0.0.0.255 network 10.40.1.0 0.0.0.255 network 192.168.1.0 0.0.0.255 # return
CE2 configuration file
# sysname CE2 # vlan batch 30 60 110 # bfd # interface Vlanif30 ip address 10.30.1.2 255.255.255.0 # interface Vlanif60 ip address 10.60.1.1 255.255.255.0 ospf cost 10 # interface Vlanif110 ip address 192.168.2.1 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 30 port hybrid untagged vlan 30 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 60 port hybrid untagged vlan 60 # interface GigabitEthernet1/0/3 port hybrid pvid vlan 110 port hybrid untagged vlan 110 # bfd ce2tope3 bind peer-ip 10.30.1.1 interface Vlanif30 discriminator local 23 discriminator remote 32 commit # ospf 1 area 0.0.0.0 network 10.30.1.0 0.0.0.255 network 10.60.1.0 0.0.0.255 network 192.168.2.0 0.0.0.255 # return
PE1 configuration file
# sysname PE1 # vlan batch 10 20 # bfd # interface Vlanif10 ip address 10.10.1.2 255.255.255.0 # interface Vlanif20 ip address 10.20.1.1 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 10 port hybrid untagged vlan 10 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 20 port hybrid untagged vlan 20 # bfd pe1toce1 bind peer-ip 10.10.1.1 interface Vlanif10 discriminator local 11 discriminator remote 10 commit # bfd pe1tope3 bind peer-ip 10.20.1.2 interface Vlanif20 discriminator local 13 discriminator remote 31 commit # ospf 1 area 0.0.0.0 network 10.10.1.0 0.0.0.255 network 10.20.1.0 0.0.0.255 # oam-mgr oam-bind ingress bfd-session 11 egress bfd-session 13 oam-bind ingress bfd-session 13 egress bfd-session 11 # return
PE2 configuration file
# sysname PE2 # vlan batch 40 50 # interface Vlanif40 ip address 10.40.1.2 255.255.255.0 # interface Vlanif50 ip address 10.50.1.1 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 40 port hybrid untagged vlan 40 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 50 port hybrid untagged vlan 50 # ospf 1 area 0.0.0.0 network 10.40.1.0 0.0.0.255 network 10.50.1.0 0.0.0.255 # return
PE3 configuration file
# sysname PE3 # vlan batch 20 30 # bfd # interface Vlanif20 ip address 10.20.1.2 255.255.255.0 # interface Vlanif30 ip address 10.30.1.1 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 20 port hybrid untagged vlan 20 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 30 port hybrid untagged vlan 30 # bfd pe3toce2 bind peer-ip 10.30.1.2 interface Vlanif30 discriminator local 32 discriminator remote 23 commit # bfd pe3tope1 bind peer-ip 10.20.1.1 interface Vlanif20 discriminator local 31 discriminator remote 13 commit # ospf 1 area 0.0.0.0 network 10.20.1.0 0.0.0.255 network 10.30.1.0 0.0.0.255 # oam-mgr oam-bind ingress bfd-session 31 egress bfd-session 32 oam-bind ingress bfd-session 32 egress bfd-session 31 # return
PE4 configuration file
# sysname PE4 # vlan batch 50 60 # interface Vlanif50 ip address 10.50.1.2 255.255.255.0 # interface Vlanif60 ip address 10.60.1.2 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 50 port hybrid untagged vlan 50 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 60 port hybrid untagged vlan 60 # ospf 1 area 0.0.0.0 network 10.50.1.0 0.0.0.255 network 10.60.1.0 0.0.0.255 # return