Auto FRR configuration example
Network requirements
Use RSVP-TE to set up a primary CRLSP that explicitly uses path Switch A—Switch B—Switch C—Switch D.
Configure auto FRR on Switch B to automatically set up bypass tunnels for the primary CRLSP.
Configure BFD for RSVP-TE between Switch B and Switch C. When the link between Switch B and Switch C fails, BFD can detect the failure quickly and notify RSVP-TE of the failure, so RSVP-TE can switch traffic to the bypass tunnel.
Figure 36: Network diagram
Table 8: Interface and IP address assignment
Device | Interface | IP address | Device | Interface | IP address |
|---|---|---|---|---|---|
Switch A | Loop0 | 1.1.1.1/32 | Switch E | Loop0 | 5.5.5.5/32 |
Vlan-int1 | 2.1.1.1/24 | Vlan-int4 | 3.2.1.2/24 | ||
Switch B | Loop0 | 2.2.2.2/32 | Vlan-int5 | 3.4.1.1/24 | |
Vlan-int1 | 2.1.1.2/24 | Switch C | Loop0 | 3.3.3.3/32 | |
Vlan-int2 | 3.1.1.1/24 | Vlan-int3 | 4.1.1.1/24 | ||
Vlan-int4 | 3.2.1.1/24 | Vlan-int2 | 3.1.1.2/24 | ||
Vlan-int6 | 3.3.1.1/24 | Vlan-int5 | 3.4.1.2/24 | ||
Switch D | Loop0 | 4.4.4.4/32 | Switch F | Loop0 | 6.6.6.6/32 |
Vlan-int3 | 4.1.1.2/24 | Vlan-int6 | 3.3.1.2/24 | ||
Vlan-int7 | 4.2.1.2/24 | Vlan-int7 | 4.2.1.1/24 |
Configuration procedure
Before configuration, disable the spanning tree feature globally or map each VLAN to an MSTI. For more information, see Layer 2—LAN Switching Configuration Guide.
Configure IP addresses and masks for interfaces. (Details not shown.)
Configure IS-IS to advertise interface addresses, including the loopback interface address. (Details not shown.)
Configure an LSR ID, and enable MPLS, MPLS TE, and RSVP-TE on each switch. Enable BFD for RSVP-TE on Switch B and Switch C:
# Configure Switch A.
<SwitchA> system-view [SwitchA] mpls lsr-id 1.1.1.1 [SwitchA] mpls te [SwitchA-te] quit [SwitchA] rsvp [SwitchA-rsvp] quit [SwitchA] interface vlan-interface 1 [SwitchA-Vlan-interface1] mpls enable [SwitchA-Vlan-interface1] mpls te enable [SwitchA-Vlan-interface1] rsvp enable [SwitchA-Vlan-interface1] quit
# Configure Switch B.
<SwitchB> system-view [SwitchB] mpls lsr-id 2.2.2.2 [SwitchB] mpls te [SwitchB-te] quit [SwitchB] rsvp [SwitchB-rsvp] quit [SwitchB] interface vlan-interface 1 [SwitchB-Vlan-interface1] mpls enable [SwitchB-Vlan-interface1] mpls te enable [SwitchB-Vlan-interface1] rsvp enable [SwitchB-Vlan-interface1] quit [SwitchB] interface vlan-interface 2 [SwitchB-Vlan-interface2] mpls enable [SwitchB-Vlan-interface2] mpls te enable [SwitchB-Vlan-interface2] rsvp enable [SwitchB-Vlan-interface2] rsvp bfd enable [SwitchB-Vlan-interface2] quit [SwitchB] interface vlan-interface 4 [SwitchB-Vlan-interface4] mpls enable [SwitchB-Vlan-interface4] mpls te enable [SwitchB-Vlan-interface4] rsvp enable [SwitchB-Vlan-interface4] quit [SwitchB] interface vlan-interface 6 [SwitchB-Vlan-interface6] mpls enable [SwitchB-Vlan-interface6] mpls te enable [SwitchB-Vlan-interface6] rsvp enable [SwitchB-Vlan-interface6] quit
# Configure Switch C in the same way that Switch B is configured. Configure Switch D, Switch E, and Switch F in the same way that Switch A is configured. (Details not shown.)
Configure an MPLS TE tunnel on Switch A, the ingress node of the primary CRLSP:
# Configure an explicit path named pri-path for the primary CRLSP.
[SwitchA] explicit-path pri-path [SwitchA-explicit-path-pri-path] nexthop 2.1.1.2 [SwitchA-explicit-path-pri-path] nexthop 3.1.1.2 [SwitchA-explicit-path-pri-path] nexthop 4.1.1.2 [SwitchA-explicit-path-pri-path] nexthop 4.4.4.4 [SwitchA-explicit-path-pri-path] quit
# Configure an MPLS TE tunnel.
[SwitchA] interface tunnel 1 mode mpls-te [SwitchA-Tunnel1] ip address 10.1.1.1 255.255.255.0
# Specify the tunnel destination address as the LSR ID of Switch D.
[SwitchA-Tunnel1] destination 4.4.4.4
# Specify the tunnel signaling protocol as RSVP-TE.
[SwitchA-Tunnel1] mpls te signaling rsvp-te
# Specify the explicit path as pri-path.
[SwitchA-Tunnel1] mpls te path preference 1 explicit-path pri-path
# Enable FRR for the MPLS TE tunnel.
[SwitchA-Tunnel1] mpls te fast-reroute [SwitchA-Tunnel1] quit
# Verify that the MPLS TE interface Tunnel1 is up on Switch A.
[SwitchA] display interface tunnel Tunnel1 Current state: UP Line protocol state: UP Description: Tunnel1 Interface Bandwidth: 64kbps Maximum transmission unit: 1496 Internet address: 10.1.1.1/24 (primary) Tunnel source unknown, destination 4.4.4.4 Tunnel TTL 255 Tunnel protocol/transport CR_LSP Last clearing of counters: Never Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec Last 300 seconds output rate: 1911 bytes/sec, 15288 bits/sec, 0 packets/sec Input: 0 packets input, 0 bytes, 0 drops Output: 1526 packets output, 22356852 bytes, 0 drops
# Display detailed information about the MPLS TE tunnel interface on Switch A.
[SwitchA] display mpls te tunnel-interface Tunnel Name : Tunnel 1 Tunnel State : Up (Main CRLSP up, Shared-resource CRLSP down) Tunnel Attributes : LSP ID : 16802 Tunnel ID : 1 Admin State : Normal Ingress LSR ID : 2.2.2.2 Egress LSR ID : 4.4.4.4 Signaling : RSVP-TE Static CRLSP Name : - Resv Style : SE Tunnel mode : - Reverse-LSP name : - Reverse-LSP LSR ID : - Reverse-LSP Tunnel ID: - Class Type : CT0 Tunnel Bandwidth : 0 kbps Reserved Bandwidth : 0 kbps Setup Priority : 7 Holding Priority : 7 Affinity Attr/Mask : 0/0 Explicit Path : exp1 Backup Explicit Path : - Metric Type : TE Record Route : Enabled Record Label : Enabled FRR Flag : Enabled Bandwidth Protection : Disabled Backup Bandwidth Flag: Disabled Backup Bandwidth Type: - Backup Bandwidth : - Bypass Tunnel : No Auto Created : No Route Pinning : Disabled Retry Limit : 3 Retry Interval : 2 sec Reoptimization : Disabled Reoptimization Freq : - Backup Type : None Backup LSP ID : - Auto Bandwidth : Disabled Auto Bandwidth Freq : - Min Bandwidth : - Max Bandwidth : - Collected Bandwidth : -
Configure auto FRR on Switch B (the PLR):
# Enable the automatic bypass tunnel setup feature globally.
[SwitchB] mpls te [SwitchB-te] auto-tunnel backup
# Specify interface numbers 50 to 100 for the automatically created bypass tunnels.
[SwitchB-te-auto-bk] tunnel-number min 50 max 100 [SwitchB-te-auto-bk] quit
Verifying the configuration
# Verify that two tunnels have been created automatically on Switch B.
[SwitchB] display interface tunnel brief Brief information on interfaces in route mode: Link: ADM - administratively down; Stby - standby Protocol: (s) - spoofing Interface Link Protocol Primary IP Description Tun50 UP DOWN -- Tun51 UP DOWN --
# Display information about Tunnel 50 and Tunnel 51 on Switch B. The output shows that Tunnel 50 and Tunnel 51 are automatically created bypass tunnels. Tunnel 50 is a node-protection bypass tunnel (egress LSR ID is 4.4.4.4, the LSR ID of Switch D). Tunnel 51 is a link-protection bypass tunnel (egress LSR ID is 3.3.3.3, the LSR ID of Switch C).
[SwitchB] display mpls te tunnel-interface tunnel 50 Tunnel Name : Tunnel 50 Tunnel State : Up (Main CRLSP up, Shared-resource CRLSP down) Tunnel Attributes : LSP ID : 16802 Tunnel ID : 50 Admin State : Normal Ingress LSR ID : 2.2.2.2 Egress LSR ID : 4.4.4.4 Signaling : RSVP-TE Static CRLSP Name : - Resv Style : SE Tunnel mode : - Reverse-LSP name : - Reverse-LSP LSR ID : - Reverse-LSP Tunnel ID: - Class Type : CT0 Tunnel Bandwidth : 0 kbps Reserved Bandwidth : 0 kbps Setup Priority : 7 Holding Priority : 7 Affinity Attr/Mask : 0/0 Explicit Path : - Backup Explicit Path : - Metric Type : TE Record Route : Enabled Record Label : Disabled FRR Flag : Disabled Bandwidth Protection : Disabled Backup Bandwidth Flag: Disabled Backup Bandwidth Type: - Backup Bandwidth : - Bypass Tunnel : Yes Auto Created : Yes Route Pinning : Disabled Retry Limit : 3 Retry Interval : 2 sec Reoptimization : Disabled Reoptimization Freq : - Backup Type : None Backup LSP ID : - Auto Bandwidth : Disabled Auto Bandwidth Freq : - Min Bandwidth : - Max Bandwidth : - Collected Bandwidth : - [SwitchB] display mpls te tunnel-interface tunnel 51 Tunnel Name : Tunnel 51 Tunnel State : Up (Main CRLSP up, Shared-resource CRLSP down) Tunnel Attributes : LSP ID : 16802 Tunnel ID : 51 Admin State : Normal Ingress LSR ID : 2.2.2.2 Egress LSR ID : 3.3.3.3 Signaling : RSVP-TE Static CRLSP Name : - Resv Style : SE Tunnel mode : - Reverse-LSP name : - Reverse-LSP LSR ID : - Reverse-LSP Tunnel ID: - Class Type : CT0 Tunnel Bandwidth : 0 kbps Reserved Bandwidth : 0 kbps Setup Priority : 7 Holding Priority : 7 Affinity Attr/Mask : 0/0 Explicit Path : - Backup Explicit Path : - Metric Type : TE Record Route : Enabled Record Label : Disabled FRR Flag : Disabled Bandwidth Protection : Disabled Backup Bandwidth Flag: Disabled Backup Bandwidth Type: - Backup Bandwidth : - Bypass Tunnel : Yes Auto Created : Yes Route Pinning : Disabled Retry Limit : 3 Retry Interval : 2 sec Reoptimization : Disabled Reoptimization Freq : - Backup Type : None Backup LSP ID : - Auto Bandwidth : Disabled Auto Bandwidth Freq : - Min Bandwidth : - Max Bandwidth : - Collected Bandwidth : -
# Verify that the current bypass tunnel that protects the primary CRLSP is tunnel 50.
[SwitchB] display mpls lsp FEC Proto In/Out Label Interface/Out NHLFE 2.2.2.2/51/16802 RSVP -/3 Vlan4 2.2.2.2/1/16802 RSVP -/1151 Vlan2 Backup -/3 Tun50 2.2.2.2/50/16802 RSVP -/3 Vlan6 3.2.1.2 Local -/- Vlan6 3.3.1.2 Local -/- Vlan6
# Display detailed information about MPLS TE Tunnel1 (the tunnel for the primary CRLSP) on Switch A. The output shows that Tunnel1 is protected by the bypass tunnel Tunnel50, and the protected node is 3.1.1.1.
[SwitchA] display rsvp lsp tunnel-id 1 verbose Tunnel name: Tunnel1 Destination: 4.4.4.4 Source: 1.1.1.1 Tunnel ID: 1 LSP ID: 16802 LSR type: Ingress Direction: Unidirectional Setup priority: 7 Holding priority: 7 In-Label: - Out-Label: 1150 In-Interface: - Out-Interface: Vlan1 Nexthop: 2.1.1.2 Exclude-any: 0 Include-Any: 0 Include-all: 0 Average bitrate: 0 kbps Maximum burst: 1000.00 bytes Path MTU: 1500 Class type: CT0 RRO number: 12 2.1.1.1/32 Flag: 0x00 (No FRR) 2.1.1.2/32 Flag: 0x00 (No FRR) 1150 Flag: 0x01 (Global label) 2.2.2.2/32 Flag: 0x20 (No FRR/Node-ID) 3.1.1.1/32 Flag: 0x09 (FRR Avail/Node-Prot) 3.1.1.2/32 Flag: 0x00 (No FRR) 1151 Flag: 0x01 (Global label) 3.3.3.3/32 Flag: 0x20 (No FRR/Node-ID) 4.1.1.1/32 Flag: 0x00 (No FRR) 4.1.1.2/32 Flag: 0x00 (No FRR) 3 Flag: 0x01 (Global label) 4.4.4.4/32 Flag: 0x20 (No FRR/Node-ID) Fast Reroute protection: Ready FRR inner label: 3 Bypass tunnel: Tunnel50