Example for Configuring MPLS TE Manual FRR
Networking Requirements
On the network shown in Figure 1, a primary tunnel is along the path LSRA -> LSRB -> LSRC -> LSRD. FRR is enabled on LSRB to protect traffic on the link between LSRB and LSRC.
A bypass CR-LSP is established over the path LSRB -> LSRE -> LSRC. LSRB is a PLR, and LSRC is an MP.
Explicit paths are used to establish the primary and bypass CR-LSPs. RSVP-TE is used as a signaling protocol.
Configuration Roadmap
The configuration roadmap is as follows:
Configure a primary CR-LSP and enable TE FRR on the tunnel interface of the primary CR-LSP.
Configure a bypass CR-LSP on the PLR (ingress) and specify the interface of the protected link.
Data Preparation
To complete the configuration, you need the following data:
Origin AS number, IS-IS level, and area ID of every LSR
Explicit paths for the primary and bypass CR-LSPs
Tunnel interface number, source and destination IP addresses, ID, and RSVP-TE signaling protocol for each of the primary and bypass CR-LSPs
Protected bandwidth and type and number of the interface on the protected link
Procedure
- Assign an IP address and its mask to every interface.
Assign an IP address and its mask to every physical interface and configure a loopback interface address as an LSR ID on every node shown in Figure 1. For configuration details, see Configuration Files in this section.
- Configure an IGP.
Enable IS-IS on all nodes to advertise host routes. For configuration details, see Configuration Files in this section.
After completing the configurations, run the display ip routing-table command on every node. All nodes have learned routes from each other.
- Configure basic MPLS functions and enable MPLS TE, CSPF, RSVP-TE, and IS-IS TE.
# Configure LSRA.
[~LSRA] mpls lsr-id 1.1.1.1 [*LSRA] mpls [*LSRA-mpls] mpls te [*LSRA-mpls] mpls rsvp-te [*LSRA-mpls] mpls te cspf [*LSRA-mpls] quit [*LSRA] interface gigabitethernet 0/1/0 [*LSRA-GigabitEthernet0/1/0] mpls [*LSRA-GigabitEthernet0/1/0] mpls te [*LSRA-GigabitEthernet0/1/0] mpls rsvp-te [*LSRA-GigabitEthernet0/1/0] quit [*LSRA] isis [*LSRA-isis-1] cost-style wide [*LSRA-isis-1] traffic-eng level-2 [*LSRA-isis-1] commit
Repeat this step for LSRB, LSRC, LSRD, and LSRE. For configuration details, see Configuration Files in this section. CSPF is enabled only on LSRA and LSRB, which are ingress nodes of the primary and bypass CR-LSPs, respectively.
- Configure an MPLS TE tunnel on LSRA.
# Configure an explicit path for the primary CR-LSP.
[~LSRA] explicit-path pri-path [*LSRA-explicit-path-pri-path] next hop 2.1.1.2 [*LSRA-explicit-path-pri-path] next hop 3.1.1.2 [*LSRA-explicit-path-pri-path] next hop 4.1.1.2 [*LSRA-explicit-path-pri-path] next hop 4.4.4.4 [*LSRA-explicit-path-pri-path] quit
# Configure the MPLS TE tunnel for the primary CR-LSP.
[*LSRA] interface tunnel 1 [*LSRA-Tunnel1] ip address unnumbered interface loopback 1 [*LSRA-Tunnel1] tunnel-protocol mpls te [*LSRA-Tunnel1] destination 4.4.4.4 [*LSRA-Tunnel1] mpls te tunnel-id 1 [*LSRA-Tunnel1] mpls te path explicit-path pri-path
# Enable FRR.
[*LSRA-Tunnel1] mpls te fast-reroute [*LSRA-Tunnel1] commit [~LSRA-Tunnel1] quit
After completing the configuration, run the display interface tunnel command on LSRA. Tunnel1 is Up.
[~LSRA] display interface tunnel Tunnel1 current state : UP (ifindex: 20) Line protocol current state : UP Last line protocol up time : 2011-05-31 06:30:58 Description: Route Port,The Maximum Transmit Unit is 1500, Current BW: 50Mbps Internet Address is unnumbered, using address of LoopBack1(1.1.1.1/32) Encapsulation is TUNNEL, loopback not set Tunnel destination 4.4.4.4 Tunnel up/down statistics 1 Tunnel protocol/transport MPLS/MPLS, ILM is available, primary tunnel id is 0x321, secondary tunnel id is 0x0 Current system time: 2011-05-31 07:32:31 300 seconds output rate 0 bits/sec, 0 packets/sec 0 seconds output rate 0 bits/sec, 0 packets/sec 126 packets output, 34204 bytes 0 output error 18 output drop Last 300 seconds input utility rate: 0.00% Last 300 seconds output utility rate: 0.00%
# Run the display mpls te tunnel-interface command on LSRA. Detailed information about the TE tunnel interface is displayed.
[~LSRA] display mpls te tunnel-interface Tunnel Name : Tunnel1 Signalled Tunnel Name: - Tunnel State Desc : CR-LSP is Up Tunnel Attributes : Active LSP : Primary LSP Traffic Switch : - Session ID : 1 Ingress LSR ID : 1.1.1.1 Egress LSR ID: 4.4.4.4 Admin State : UP Oper State : UP Signaling Protocol : RSVP FTid : 1 Tie-Breaking Policy : None Metric Type : None Bfd Cap : None Reopt : Disabled Reopt Freq : - Inter-area Reopt : Disabled Auto BW : Disabled Threshold : 0 percent Current Collected BW: 0 kbps Auto BW Freq : 0 Min BW : 0 kbps Max BW : 0 kbps Offload : Disabled Offload Freq : - Low Value : - High Value : - Readjust Value : - Offload Explicit Path Name: Tunnel Group : - Interfaces Protected: - Excluded IP Address : - Referred LSP Count : 0 Primary Tunnel : - Pri Tunn Sum : - Backup Tunnel : - Group Status : Up Oam Status : - IPTN InLabel : - Tunnel BFD Status : - BackUp LSP Type : Hot-Standby BestEffort : Enabled Secondary HopLimit : - BestEffort HopLimit : - Secondary Explicit Path Name: - Secondary Affinity Prop/Mask: 0x0/0x0 BestEffort Affinity Prop/Mask: 0x0/0x0 IsConfigLspConstraint: - Hot-Standby Revertive Mode: Revertive Hot-Standby Overlap-path: Disabled Hot-Standby Switch State: CLEAR Bit Error Detection: Disabled Bit Error Detection Switch Threshold: - Bit Error Detection Resume Threshold: - Ip-Prefix Name : - P2p-Template Name : - PCE Delegate : No LSP Control Status : Local control Path Verification : - Entropy Label : None Auto BW Remain Time : 200 s Reopt Remain Time : 100 s Metric Inherit IGP : None Binding Sid : - Reverse Binding Sid : - Self-Ping : Disable Self-Ping Duration : 1800 sec FRR Attr Source : - Is FRR degrade down : No Primary LSP ID : 1.1.1.1:19 LSP State : UP LSP Type : Primary Setup Priority : 7 Hold Priority: 7 IncludeAll : 0x0 IncludeAny : 0x0 ExcludeAny : 0x0 Affinity Prop/Mask : 0x0/0x0 Resv Style : SE Configured Bandwidth Information: CT0 Bandwidth(Kbit/sec): 10000 CT1 Bandwidth(Kbit/sec): 0 CT2 Bandwidth(Kbit/sec): 0 CT3 Bandwidth(Kbit/sec): 0 CT4 Bandwidth(Kbit/sec): 0 CT5 Bandwidth(Kbit/sec): 0 CT6 Bandwidth(Kbit/sec): 0 CT7 Bandwidth(Kbit/sec): 0 Actual Bandwidth Information: CT0 Bandwidth(Kbit/sec): 10000 CT1 Bandwidth(Kbit/sec): 0 CT2 Bandwidth(Kbit/sec): 0 CT3 Bandwidth(Kbit/sec): 0 CT4 Bandwidth(Kbit/sec): 0 CT5 Bandwidth(Kbit/sec): 0 CT6 Bandwidth(Kbit/sec): 0 CT7 Bandwidth(Kbit/sec): 0 Explicit Path Name : pri-path Hop Limit: - Record Route : Disabled Record Label : Disabled Route Pinning : Disabled FRR Flag : Disabled IdleTime Remain : - BFD Status : - Soft Preemption : Enabled Reroute Flag : Disabled Pce Flag : Normal Path Setup Type : EXPLICIT Create Modify LSP Reason: - Self-Ping Status : - Backup LSP ID : 1.1.1.1:46945 IsBestEffortPath : No LSP State : UP LSP Type : Hot-Standby Setup Priority : 7 Hold Priority: 7 IncludeAll : 0x0 IncludeAny : 0x0 ExcludeAny : 0x0 Affinity Prop/Mask : 0x0/0x0 Resv Style : SE Configured Bandwidth Information: CT0 Bandwidth(Kbit/sec): 0 CT1 Bandwidth(Kbit/sec): 0 CT2 Bandwidth(Kbit/sec): 0 CT3 Bandwidth(Kbit/sec): 0 CT4 Bandwidth(Kbit/sec): 0 CT5 Bandwidth(Kbit/sec): 0 CT6 Bandwidth(Kbit/sec): 0 CT7 Bandwidth(Kbit/sec): 0 Actual Bandwidth Information: CT0 Bandwidth(Kbit/sec): 0 CT1 Bandwidth(Kbit/sec): 0 CT2 Bandwidth(Kbit/sec): 0 CT3 Bandwidth(Kbit/sec): 0 CT4 Bandwidth(Kbit/sec): 0 CT5 Bandwidth(Kbit/sec): 0 CT6 Bandwidth(Kbit/sec): 0 CT7 Bandwidth(Kbit/sec): 0 Explicit Path Name : - Hop Limit: - Record Route : Enabled Record Label : Disabled Route Pinning : Disabled FRR Flag : Disabled IdleTime Remain : - BFD Status : - Soft Preemption : Enabled Reroute Flag : Enabled Pce Flag : Normal Path Setup Type : CSPF Create Modify LSP Reason: - Self-Ping Status : -
- Configure a bypass CR-LSP on LSRB.
# Configure an explicit path for the bypass CR-LSP.
[~LSRB] explicit-path by-path [*LSRB-explicit-path-by-path] next hop 3.2.1.2 [*LSRB-explicit-path-by-path] next hop 3.3.1.2 [*LSRB-explicit-path-by-path] next hop 3.3.3.3 [*LSRB-explicit-path-by-path] quit
# Configure the bypass CR-LSP.
[*LSRB] interface tunnel 3 [*LSRB-Tunnel3] ip address unnumbered interface loopback 1 [*LSRB-Tunnel3] tunnel-protocol mpls te [*LSRB-Tunnel3] destination 3.3.3.3 [*LSRB-Tunnel3] mpls te tunnel-id 2 [*LSRB-Tunnel3] mpls te path explicit-path by-path [*LSRB-Tunnel3] mpls te bypass-tunnel
# Bind the bypass CR-LSP to the interface of the protected link.
[*LSRB-Tunnel3] mpls te protected-interface gigabitethernet 0/1/8 [*LSRB-Tunnel3] commit [~LSRB-Tunnel3] quit
After completing the configuration, run the display interface tunnel command on LSRB. The tunnel named Tunnel3 is Up.
Run the display mpls te tunnel name Tunnel1 verbose command on LSRB. The bypass tunnel is bound to the outbound interface GE 0/1/8 and is not in use.
[~LSRB] display mpls te tunnel name Tunnel1 verbose No : 1 Tunnel-Name : Tunnel1 Tunnel Interface Name : Tunnel1 TunnelIndex : - Session ID : 1 LSP ID : 95 Lsr Role : Transit Ingress LSR ID : 1.1.1.1 Egress LSR ID : 4.4.4.4 In-Interface : GE0/1/0 Out-Interface : GE0/1/8 Sign-Protocol : RSVP TE Resv Style : SE IncludeAnyAff : 0x0 ExcludeAnyAff : 0x0 IncludeAllAff : 0x0 ER-Hop Table Index : - AR-Hop Table Index: - C-Hop Table Index : - PrevTunnelIndexInSession: - NextTunnelIndexInSession: - PSB Handle : - Created Time : 2012/02/01 04:53:22 -------------------------------- DS-TE Information -------------------------------- Bandwidth Reserved Flag : Reserved CT0 Bandwidth(Kbit/sec) : 10000 CT1 Bandwidth(Kbit/sec): 0 CT2 Bandwidth(Kbit/sec) : 0 CT3 Bandwidth(Kbit/sec): 0 CT4 Bandwidth(Kbit/sec) : 0 CT5 Bandwidth(Kbit/sec): 0 CT6 Bandwidth(Kbit/sec) : 0 CT7 Bandwidth(Kbit/sec): 0 Setup-Priority : 7 Hold-Priority : 7 -------------------------------- FRR Information -------------------------------- Primary LSP Info Bypass In Use : Not Used Bypass Tunnel Id : 1 BypassTunnel : Tunnel Index[Tunnel3], InnerLabel[16] Bypass Lsp ID : 8 FrrNextHop : 3.3.1.1 ReferAutoBypassHandle : - FrrPrevTunnelTableIndex : - FrrNextTunnelTableIndex: - Bypass Attribute Setup Priority : 7 Hold Priority : 7 HopLimit : 32 Bandwidth : 0 IncludeAnyGroup : 0 ExcludeAnyGroup : 0 IncludeAllGroup : 0 Bypass Unbound Bandwidth Info(Kbit/sec) CT0 Unbound Bandwidth : - CT1 Unbound Bandwidth: - CT2 Unbound Bandwidth : - CT3 Unbound Bandwidth: - CT4 Unbound Bandwidth : - CT5 Unbound Bandwidth: - CT6 Unbound Bandwidth : - CT7 Unbound Bandwidth: - -------------------------------- BFD Information -------------------------------- NextSessionTunnelIndex : - PrevSessionTunnelIndex: - NextLspId : - PrevLspId : -
- Verify the configuration.
# Shut down the outbound interface of the protected link on the PLR.
[~LSRB] interface gigabitethernet 0/1/8 [~LSRB-GigabitEthernet0/1/8] shutdown [*LSRB-GigabitEthernet0/1/8] commit
Run the display interface tunnel 1 command on LSRA. The tunnel interface of the primary CR-LSP is still Up.
Run the tracert lsp te tunnel1 command on LSRA. The path through which the primary CR-LSP passes is displayed.
[~LSRA] tracert lsp te tunnel1 LSP Trace Route FEC: TE TUNNEL IPV4 SESSION QUERY Tunnel1 , press CTRL_C to break. TTL Replier Time Type Downstream 0 Ingress 2.1.1.2/[25 ] 1 2.1.1.2 3 Transit 3.2.1.2/[16 16 ] 2 3.2.1.2 4 Transit 3.3.1.2/[3 ] 3 3.3.1.2 4 Transit 4.1.1.2/[3 ] 4 4.4.4.4 3 EgressThe preceding command output shows that traffic has switched to the bypass CR-LSP.
If the display mpls te tunnel-interface command is run immediately after FRR switching has been performed, two CR-LSPs are both Up. This is because FRR uses the make-before-break mechanism to establish a bypass CR-LSP. The original CR-LSP will be deleted after a new CR-LSP has been established.
Run the display mpls te tunnel name Tunnel1 verbose command on LSRB. The bypass CR-LSP is being used.
[~LSRB] display mpls te tunnel name Tunnel1 verbose No : 1 Tunnel-Name : Tunnel1 Tunnel Interface Name : Tunnel1 TunnelIndex : - Session ID : 1 LSP ID : 95 Lsr Role : Transit Ingress LSR ID : 1.1.1.1 Egress LSR ID : 4.4.4.4 In-Interface : GE0/1/0 Out-Interface : GE0/1/8 Sign-Protocol : RSVP TE Resv Style : SE IncludeAnyAff : 0x0 ExcludeAnyAff : 0x0 IncludeAllAff : 0x0 ER-Hop Table Index : - AR-Hop Table Index: - C-Hop Table Index : - PrevTunnelIndexInSession: - NextTunnelIndexInSession: - PSB Handle : - Created Time : 2012/02/01 04:53:22 -------------------------------- DS-TE Information -------------------------------- Bandwidth Reserved Flag : Reserved CT0 Bandwidth(Kbit/sec) : 10000 CT1 Bandwidth(Kbit/sec): 0 CT2 Bandwidth(Kbit/sec) : 0 CT3 Bandwidth(Kbit/sec): 0 CT4 Bandwidth(Kbit/sec) : 0 CT5 Bandwidth(Kbit/sec): 0 CT6 Bandwidth(Kbit/sec) : 0 CT7 Bandwidth(Kbit/sec): 0 Setup-Priority : 7 Hold-Priority : 7 -------------------------------- FRR Information -------------------------------- Primary LSP Info Bypass In Use : In Use Bypass Tunnel Id : 1 BypassTunnel : Tunnel Index[Tunnel3], InnerLabel[16] Bypass Lsp ID : 8 FrrNextHop : 3.3.3.3 ReferAutoBypassHandle : - FrrPrevTunnelTableIndex : - FrrNextTunnelTableIndex: - Bypass Attribute Setup Priority : 7 Hold Priority : 7 HopLimit : 32 Bandwidth : 0 IncludeAnyGroup : 0 ExcludeAnyGroup : 0 IncludeAllGroup : 0 Bypass Unbound Bandwidth Info(Kbit/sec) CT0 Unbound Bandwidth : - CT1 Unbound Bandwidth: - CT2 Unbound Bandwidth : - CT3 Unbound Bandwidth: - CT4 Unbound Bandwidth : - CT5 Unbound Bandwidth: - CT6 Unbound Bandwidth : - CT7 Unbound Bandwidth: - -------------------------------- BFD Information -------------------------------- NextSessionTunnelIndex : - PrevSessionTunnelIndex: - NextLspId : - PrevLspId : -
# Start the outbound interface of the protected link on the PLR.
[~LSRB] interface gigabitethernet 0/1/8 [~LSRB-GigabitEthernet0/1/8] undo shutdown [*LSRB-GigabitEthernet0/1/8] commit
Run the display interface tunnel1 command on LSRA. The tunnel interface of the primary CR-LSP is UP.
After specified period of time elapses, run the display mpls te tunnel name tunnel1 verbose command on LSRB. Tunnel1's Bypass In Use status is Not Used, indicating that traffic has switched back to GE 0/1/8.
Configuration Files
LSRA configuration file
# sysname LSRA # mpls lsr-id 1.1.1.1 # mpls mpls te mpls te cspf mpls rsvp-te # explicit-path pri-path next hop 2.1.1.2 next hop 3.1.1.2 next hop 4.1.1.2 next hop 4.4.4.4 # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0001.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 2.1.1.1 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 1.1.1.1 255.255.255.255 isis enable 1 # interface Tunnel1 ip address unnumbered interface LoopBack1 tunnel-protocol mpls te destination 4.4.4.4 mpls te tunnel-id 1 mpls te record-route label mpls te path explicit-path pri-path mpls te fast-reroute # returnLSRB configuration file
# sysname LSRB # mpls lsr-id 2.2.2.2 # mpls mpls te mpls te cspf mpls rsvp-te # explicit-path by-path next hop 3.2.1.2 next hop 3.3.1.2 next hop 3.3.3.3 # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0002.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 2.1.1.2 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface GigabitEthernet0/1/8 undo shutdown ip address 3.1.1.1 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface GigabitEthernet0/1/16 undo shutdown ip address 3.2.1.1 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 2.2.2.2 255.255.255.255 isis enable 1 # interface Tunnel3 ip address unnumbered interface LoopBack1 tunnel-protocol mpls te destination 3.3.3.3 mpls te tunnel-id 2 mpls te record-route mpls te path explicit-path by-path mpls te bypass-tunnel mpls te protected-interface GigabitEthernet 0/1/8 # return
LSRC configuration file
# sysname LSRC # mpls lsr-id 3.3.3.3 # mpls mpls te mpls rsvp-te # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0003.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 4.1.1.1 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface GigabitEthernet0/1/8 undo shutdown ip address 3.1.1.2 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface GigabitEthernet0/1/16 undo shutdown ip address 3.3.1.2 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 3.3.3.3 255.255.255.255 isis enable 1 # return
LSRD configuration file
# sysname LSRD # mpls lsr-id 4.4.4.4 # mpls mpls te mpls rsvp-te # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0004.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 4.1.1.2 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 4.4.4.4 255.255.255.255 isis enable 1 # returnLSRE configuration file
# sysname LSRE # mpls lsr-id 5.5.5.5 # mpls mpls te mpls rsvp-te # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0005.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 3.2.1.2 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface GigabitEthernet0/1/8 undo shutdown ip address 3.3.1.1 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 5.5.5.5 255.255.255.255 isis enable 1 # return