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Example for Configuring Static BFD to Detect LDP LSPs
Networking Requirements
As shown in Figure 2-18, the network topology is simple and stable, PEs and P are MPLS backbone network devices, and LDP LSPs are set up on the backbone network to transmit network services.
Network services, such as VoIP, online game, and online video service, have high requirements for real-timeness. Data loss caused by faulty links will seriously affect services. It is required that services be fast switched to the backup LSP when the primary LSP becomes faulty, minimizing packet loss. Static BFD for LDP LSPs is configured to fast detect LDP LSPs.
Ensure that STP is disabled in this scenario; otherwise, the primary LSP may be unavailable.
Configuration Roadmap
The configuration roadmap is as follows:
- Configure OSPF between the PEs and P to implement IP connectivity on the backbone network.
- Configure local LDP sessions on PEs and P so that LDP LSPs can be set up to transmit network services.
- Configure static BFD on PEs to fast detect LDP LSPs.
CE switches cannot function as PE devices. The configurations of PE devices in this example are only for your reference. In real-world networking, you need to select the devices that can function as PE devices and configure the devices according to the product manual. It is recommended that NE routers be used as PE devices.
Procedure
- Create VLANs and VLANIF interfaces on the switch, configure IP addresses for the VLANIF interfaces, and add physical interfaces to the VLANs.
# Configure PE1. The configurations of P1, P2, and PE2 are similar to the configuration of PE1, and are not mentioned here.
<HUAWEI> system-view [~HUAWEI] sysname PE1 [*HUAWEI] commit [~PE1] interface loopback 1 [*PE1-LoopBack1] ip address 1.1.1.1 32 [*PE1-LoopBack1] quit [*PE1] vlan batch 10 30 [*PE1] interface vlanif 10 [*PE1-Vlanif10] ip address 10.1.1.1 24 [*PE1-Vlanif10] quit [*PE1] interface vlanif 30 [*PE1-Vlanif30] ip address 10.3.1.1 24 [*PE1-Vlanif30] quit [*PE1] interface 10ge 1/0/1 [*PE1-10GE1/0/1] port link-type trunk [*PE1-10GE1/0/1] port trunk allow-pass vlan 10 [*PE1-10GE1/0/1] quit [*PE1] interface 10ge 2/0/2 [*PE1-10GE2/0/2] port link-type trunk [*PE1-10GE2/0/2] port trunk allow-pass vlan 30 [*PE1-10GE2/0/2] quit
- Configure OSPF to advertise the network segments connecting to interfaces on each node and to advertise the routes of hosts with LSR IDs.
# Configure PE1. The configurations of P1, P2, and PE2 are similar to the configuration of PE1, and are not mentioned here.
[*PE1] ospf 1 [*PE1-ospf-1] area 0 [*PE1-ospf-1-area-0.0.0.0] network 1.1.1.1 0.0.0.0 [*PE1-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255 [*PE1-ospf-1-area-0.0.0.0] network 10.3.1.0 0.0.0.255 [*PE1-ospf-1-area-0.0.0.0] quit [*PE1-ospf-1] quit
- Set the cost of VLANIF 30 on PE1 to 1000.
[*PE1] interface vlanif 30 [*PE1-Vlanif30] ospf cost 1000 [*PE1-Vlanif30] quit [*PE1] commit
After the configuration is complete, run the display ip routing-table command on each node. You can see that the nodes learn routes from each other. The outbound interface of the route from PE1 to PE2 is VLANIF 10.
- Configure local LDP sessions.
# Configure PE1. The configurations of P1, P2, and PE2 are similar to the configuration of PE1, and are not mentioned here.
[~PE1] mpls lsr-id 1.1.1.1 [*PE1] mpls [*PE1-mpls] quit [*PE1] mpls ldp [*PE1-mpls-ldp] quit [*PE1] interface vlanif 10 [*PE1-Vlanif10] mpls [*PE1-Vlanif10] mpls ldp [*PE1-Vlanif10] quit [*PE1] interface vlanif 30 [*PE1-Vlanif30] mpls [*PE1-Vlanif30] mpls ldp [*PE1-Vlanif30] quit [*PE1] commit
# Run the display mpls ldp lsp command. The command output shows that an LDP LSP destined for 4.4.4.4/32 is set up on PE1.
[~PE1] display mpls ldp lsp LDP LSP Information An asterisk (*) before an LSP means the LSP is not established An asterisk (*) before a Label means the USCB or DSCB is stale An asterisk (*) before a UpstreamPeer means the session is in GR state An asterisk (*) before a DS means the session is in GR state An asterisk (*) before a NextHop means the LSP is FRR LSP ------------------------------------------------------------------------------- DestAddress/Mask In/OutLabel UpstreamPeer NextHop OutInterface ------------------------------------------------------------------------------- 1.1.1.1/32 3/NULL 2.2.2.2 127.0.0.1 InLoop0 1.1.1.1/32 3/NULL 3.3.3.3 127.0.0.1 InLoop0 *1.1.1.1/32 Liberal/1024 DS/2.2.2.2 *1.1.1.1/32 Liberal/1024 DS/3.3.3.3 2.2.2.2/32 NULL/3 - 10.1.1.2 Vlanif10 2.2.2.2/32 1024/3 2.2.2.2 10.1.1.2 Vlanif10 2.2.2.2/32 1024/3 3.3.3.3 10.1.1.2 Vlanif10 *2.2.2.2/32 Liberal/1025 DS/3.3.3.3 3.3.3.3/32 NULL/1026 - 10.1.1.2 Vlanif10 3.3.3.3/32 1026/1026 2.2.2.2 10.1.1.2 Vlanif10 3.3.3.3/32 1026/1026 3.3.3.3 10.1.1.2 Vlanif10 *3.3.3.3/32 Liberal/3 DS/3.3.3.3 4.4.4.4/32 NULL/1025 - 10.1.1.2 Vlanif10 4.4.4.4/32 1025/1025 2.2.2.2 10.1.1.2 Vlanif10 4.4.4.4/32 1025/1025 3.3.3.3 10.1.1.2 Vlanif10 *4.4.4.4/32 Liberal/1026 DS/3.3.3.3 ------------------------------------------------------------------------------- TOTAL: 11 Normal LSP(s) Found, 5 Liberal LSP(s) Found 0 FRR LSP(s) Found. - Enable global BFD on the two nodes of the detected link.
# Configure PE1.
[~PE1] bfd [*PE1-bfd] quit
# Configure PE2.
[~PE2] bfd [*PE2-bfd] quit
- Bind the BFD session destined for the LDP LSP on PE1.
# Configure PE1.
[*PE1] bfd pe1tope2 bind ldp-lsp peer-ip 4.4.4.4 nexthop 10.1.1.2 interface vlanif 10 [*PE1-bfd-lsp-session-pe1tope2] discriminator local 1 [*PE1-bfd-lsp-session-pe1tope2] discriminator remote 2 [*PE1-bfd-lsp-session-pe1tope2] commit [~PE1-bfd-lsp-session-pe1tope2] quit
- On PE2, configure a BFD session that is bound to the IP link to notify PE1 of the detected faults on the LDP LSP.
# Configure PE2.
[*PE2] bfd pe2tope1 bind peer-ip 1.1.1.1 [*PE2-bfd-session-pe2tope1] discriminator local 2 [*PE2-bfd-session-pe2tope1] discriminator remote 1 [*PE2-bfd-session-pe2tope1] commit [~PE2-bfd-session-pe2tope1] quit
- Verify the configuration.
# Run the display bfd session all command on PE1. The command output shows that the State field is displayed as Up.
[~PE1] display bfd session all S: Static session D: Dynamic session IP: IP session IF: Single-hop session PEER: Multi-hop session LDP: LDP session LSP: Label switched path TE: Traffic Engineering AUTO: Automatically negotiated session VXLAN: VXLAN session (w): State in WTR (*): State is invalid Total UP/DOWN Session Number : 1/0 -------------------------------------------------------------------------------- Local Remote PeerIpAddr State Type InterfaceName -------------------------------------------------------------------------------- 1 2 4.4.4.4 Up S/LDP-LSP Vlanif10 --------------------------------------------------------------------------------# Run the display bfd session all command on PE2, and the command output that the State field is displayed as Up.
[~PE2] display bfd session all S: Static session D: Dynamic session IP: IP session IF: Single-hop session PEER: Multi-hop session LDP: LDP session LSP: Label switched path TE: Traffic Engineering AUTO: Automatically negotiated session VXLAN: VXLAN session (w): State in WTR (*): State is invalid Total UP/DOWN Session Number : 1/0 -------------------------------------------------------------------------------- Local Remote PeerIpAddr State Type InterfaceName -------------------------------------------------------------------------------- 2 1 1.1.1.1 Up S/IP-PEER - --------------------------------------------------------------------------------
Configuration Files
PE1 configuration file
# sysname PE1 # vlan batch 10 30 # bfd # mpls lsr-id 1.1.1.1 # mpls # mpls ldp # ipv4-family # interface Vlanif10 ip address 10.1.1.1 255.255.255.0 mpls mpls ldp # interface Vlanif30 ip address 10.3.1.1 255.255.255.0 ospf cost 1000 mpls mpls ldp # interface 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 10 # interface 10GE2/0/2 port link-type trunk port trunk allow-pass vlan 30 # interface LoopBack1 ip address 1.1.1.1 255.255.255.255 # ospf 1 area 0.0.0.0 network 1.1.1.1 0.0.0.0 network 10.1.1.0 0.0.0.255 network 10.3.1.0 0.0.0.255 # bfd pe1tope2 bind ldp-lsp peer-ip 4.4.4.4 nexthop 10.1.1.2 interface Vlanif10 discriminator local 1 discriminator remote 2 # return
P1 configuration file
# sysname P1 # vlan batch 10 20 # mpls lsr-id 2.2.2.2 # mpls # mpls ldp # ipv4-family # interface Vlanif10 ip address 10.1.1.2 255.255.255.0 mpls mpls ldp # interface Vlanif20 ip address 10.2.1.1 255.255.255.0 mpls mpls ldp # interface 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 10 # interface 10GE2/0/2 port link-type trunk port trunk allow-pass vlan 20 # interface LoopBack1 ip address 2.2.2.2 255.255.255.255 # ospf 1 area 0.0.0.0 network 2.2.2.2 0.0.0.0 network 10.1.1.0 0.0.0.255 network 10.2.1.0 0.0.0.255 # return
P2 configuration file
# sysname P2 # vlan batch 30 40 # mpls lsr-id 3.3.3.3 # mpls # mpls ldp # ipv4-family # interface Vlanif30 ip address 10.3.1.2 255.255.255.0 mpls mpls ldp # interface Vlanif40 ip address 10.4.1.1 255.255.255.0 mpls mpls ldp # interface 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 30 # interface 10GE2/0/2 port link-type trunk port trunk allow-pass vlan 40 # interface LoopBack1 ip address 3.3.3.3 255.255.255.255 # ospf 1 area 0.0.0.0 network 3.3.3.3 0.0.0.0 network 10.3.1.0 0.0.0.255 network 10.4.1.0 0.0.0.255 # return
PE2 configuration file
# sysname PE2 # vlan batch 20 40 # bfd # mpls lsr-id 4.4.4.4 # mpls # mpls ldp # ipv4-family # interface Vlanif20 ip address 10.2.1.2 255.255.255.0 mpls mpls ldp # interface Vlanif40 ip address 10.4.1.2 255.255.255.0 mpls mpls ldp # interface 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 20 # interface 10GE2/0/2 port link-type trunk port trunk allow-pass vlan 40 # interface LoopBack1 ip address 4.4.4.4 255.255.255.255 # bfd pe2tope1 bind peer-ip 1.1.1.1 discriminator local 2 discriminator remote 1 # ospf 1 area 0.0.0.0 network 4.4.4.4 0.0.0.0 network 10.2.1.0 0.0.0.255 network 10.4.1.0 0.0.0.255 # return