Example for Configuring TI-LFA FRR for a Loose SR-MPLS TE Tunnel
Topology-Independent Loop-Free Alternate (TI-LFA) FRR can be configured to enhance the reliability of a Segment Routing (SR) network.
Networking Requirements
On the network shown in Figure 1, IS-IS is enabled. The cost of the link between Device C and Device D is 100, and the cost of other links is 10. Based on node SIDs, an SR-MPLS TE tunnel (Device A -> Device B -> Device E -> Device F) is established from Device A to Device F through static explicit paths.
The SR-MPLS TE tunnel established based on node SIDs is a loose one that supports TI-LFA FRR. TI-LFA FRR can be configured on Device B to provide local protection, enabling traffic to be quickly switched to the backup path (Device A -> Device B -> Device C -> Device D -> Device E -> Device F) when the link between Device B and Device E fails.
Precautions
In this example, TI-LFA FRR is configured on DeviceB to protect the link between DeviceB and DeviceE. On a live network, you are advised to configure TI-LFA FRR on all nodes in the SR domain.
Configuration Roadmap
The configuration roadmap is as follows:
Configure IS-IS on the entire network to implement interworking between devices.
Enable MPLS on the entire network and configure SR.
- Configure an explicit path on Device A and establish an SR-MPLS TE tunnel.
Enable TI-LFA FRR and anti-microloop on Device B.
Data Preparation
To complete the configuration, you need the following data:
MPLS LSR ID of each device
SRGB range of each device
Procedure
- Configure interface IP addresses.
# Configure Device A.
<HUAWEI> system-view [~HUAWEI] sysname DeviceA [*HUAWEI] commit [~DeviceA] interface loopback 1 [*DeviceA-LoopBack1] ip address 1.1.1.9 32 [*DeviceA-LoopBack1] quit [*DeviceA] interface gigabitethernet0/1/0 [*DeviceA-GigabitEthernet0/1/0] ip address 10.1.1.1 24 [*DeviceA-GigabitEthernet0/1/0] quit [*DeviceA] commit
Repeat this step for the other devices. For configuration details, see Configuration Files in this section.
- Configure an IGP to implement interworking. IS-IS is used as an example.
# Configure Device A.
[~DeviceA] isis 1 [*DeviceA-isis-1] is-level level-1 [*DeviceA-isis-1] network-entity 10.0000.0000.0001.00 [*DeviceA-isis-1] cost-style wide [*DeviceA-isis-1] quit [*DeviceA] interface loopback 1 [*DeviceA-LoopBack1] isis enable 1 [*DeviceA-LoopBack1] quit [*DeviceA] interface gigabitethernet0/1/0 [*DeviceA-GigabitEthernet0/1/0] isis enable 1 [*DeviceA-GigabitEthernet0/1/0] quit [*DeviceA] commit
Repeat this step for the other devices. For configuration details, see Configuration Files in this section.
Set the cost of the link between DeviceC and DeviceD to 100 to simulate a special network scenario.
# Configure DeviceC.
[~DeviceC] interface gigabitethernet0/1/8 [~DeviceC-GigabitEthernet0/1/8] isis cost 100 [*DeviceC-GigabitEthernet0/1/8] quit [*DeviceC] commit
# Configure DeviceD.
[~DeviceD] interface gigabitethernet0/1/0 [~DeviceD-GigabitEthernet0/1/0] isis cost 100 [*DeviceD-GigabitEthernet0/1/0] quit [*DeviceD] commit
- Configure basic MPLS capabilities on the backbone network.
# Configure Device A.
[~DeviceA] mpls lsr-id 1.1.1.9 [*DeviceA] mpls [*DeviceA-mpls] mpls te [*DeviceA-mpls] commit [~DeviceA-mpls] quit
# Configure Device B.
[~DeviceB] mpls lsr-id 2.2.2.9 [*DeviceB] mpls [*DeviceB-mpls] mpls te [*DeviceB-mpls] commit [~DeviceB-mpls] quit
# Configure Device C.
[~DeviceC] mpls lsr-id 3.3.3.9 [*DeviceC] mpls [*DeviceC-mpls] mpls te [*DeviceC-mpls] commit [~DeviceC-mpls] quit
# Configure Device D.
[~DeviceD] mpls lsr-id 4.4.4.9 [*DeviceD] mpls [*DeviceD-mpls] mpls te [*DeviceD-mpls] commit [~DeviceD-mpls] quit
# Configure Device E.
[~DeviceE] mpls lsr-id 5.5.5.9 [*DeviceE] mpls [*DeviceE-mpls] mpls te [*DeviceE-mpls] commit [~DeviceE-mpls] quit
# Configure Device F.
[~DeviceF] mpls lsr-id 6.6.6.9 [*DeviceF] mpls [*DeviceF-mpls] mpls te [*DeviceF-mpls] commit [~DeviceF-mpls] quit
- Configure basic SR functions on the backbone network.
# Configure Device A.
[~DeviceA] segment-routing [*DeviceA-segment-routing] quit [*DeviceA] isis 1 [*DeviceA-isis-1] segment-routing mpls [*DeviceA-isis-1] segment-routing global-block 16000 23999
The SRGB range varies according to the device. The configuration in this example is for reference only.
[*DeviceA-isis-1] quit [*DeviceA] interface loopback 1 [*DeviceA-LoopBack1] isis prefix-sid index 10 [*DeviceA-LoopBack1] quit [*DeviceA] commit
# Configure Device B.
[~DeviceB] segment-routing [*DeviceB-segment-routing] quit [*DeviceB] isis 1 [*DeviceB-isis-1] segment-routing mpls [*DeviceB-isis-1] segment-routing global-block 16000 23999
The SRGB range varies according to the device. The configuration in this example is for reference only.
[*DeviceB-isis-1] quit [*DeviceB] interface loopback 1 [*DeviceB-LoopBack1] isis prefix-sid index 20 [*DeviceB-LoopBack1] quit [*DeviceB] commit
# Configure Device C.
[~DeviceC] segment-routing [*DeviceC-segment-routing] quit [*DeviceC] isis 1 [*DeviceC-isis-1] segment-routing mpls [*DeviceC-isis-1] segment-routing global-block 16000 23999
The SRGB range varies according to the device. The configuration in this example is for reference only.
[*DeviceC-isis-1] quit [*DeviceC] interface loopback 1 [*DeviceC-LoopBack1] isis prefix-sid index 30 [*DeviceC-LoopBack1] quit [*DeviceC] commit
# Configure Device D.
[~DeviceD] segment-routing [*DeviceD-segment-routing] quit [*DeviceD] isis 1 [*DeviceD-isis-1] segment-routing mpls [*DeviceD-isis-1] segment-routing global-block 16000 23999
The SRGB range varies according to the device. The configuration in this example is for reference only.
[*DeviceD-isis-1] quit [*DeviceD] interface loopback 1 [*DeviceD-LoopBack1] isis prefix-sid index 40 [*DeviceD-LoopBack1] quit [*DeviceD] commit
# Configure Device E.
[~DeviceE] segment-routing [*DeviceE-segment-routing] quit [*DeviceE] isis 1 [*DeviceE-isis-1] segment-routing mpls [*DeviceE-isis-1] segment-routing global-block 16000 23999
The SRGB range varies according to the device. The configuration in this example is for reference only.
[*DeviceE-isis-1] quit [*DeviceE] interface loopback 1 [*DeviceE-LoopBack1] isis prefix-sid index 50 [*DeviceE-LoopBack1] quit [*DeviceE] commit
# Configure Device F.
[~DeviceF] segment-routing [*DeviceF-segment-routing] quit [*DeviceF] isis 1 [*DeviceF-isis-1] segment-routing mpls [*DeviceF-isis-1] segment-routing global-block 16000 23999
The SRGB range varies according to the device. The configuration in this example is for reference only.
[*DeviceF-isis-1] quit [*DeviceF] interface loopback 1 [*DeviceF-LoopBack1] isis prefix-sid index 60 [*DeviceF-LoopBack1] quit [*DeviceF] commit
# After completing the configurations, run the display segment-routing prefix mpls forwarding command on each device. The command output shows that SR-MPLS BE LSPs have been established. The command output on DeviceA is used as an example.
[~DeviceA] display segment-routing prefix mpls forwarding Segment Routing Prefix MPLS Forwarding Information -------------------------------------------------------------- Role : I-Ingress, T-Transit, E-Egress, I&T-Ingress And Transit Prefix Label OutLabel Interface NextHop Role MPLSMtu Mtu State ----------------------------------------------------------------------------------------------------------------- 1.1.1.9/32 16010 NULL Loop1 127.0.0.1 E --- 1500 Active 2.2.2.9/32 16020 3 GE0/1/0 10.1.1.2 I&T --- 1500 Active 3.3.3.9/32 16030 16030 GE0/1/0 10.1.1.2 I&T --- 1500 Active 4.4.4.9/32 16040 16040 GE0/1/0 10.1.1.2 I&T --- 1500 Active 5.5.5.9/32 16050 16050 GE0/1/0 10.1.1.2 I&T --- 1500 Active 6.6.6.9/32 16060 16060 GE0/1/0 10.1.1.2 I&T --- 1500 Active Total information(s): 6
- Configure an SR-MPLS TE tunnel.
# Configure Device A.
[~DeviceA] explicit-path p1 [*DeviceA-explicit-path-p1] next sid label 16020 type prefix [*DeviceA-explicit-path-p1] next sid label 16050 type prefix [*DeviceA-explicit-path-p1] next sid label 16060 type prefix [*DeviceA-explicit-path-p1] quit [*DeviceA] interface tunnel1 [*DeviceA-Tunnel1] ip address unnumbered interface LoopBack1 [*DeviceA-Tunnel1] tunnel-protocol mpls te [*DeviceA-Tunnel1] destination 6.6.6.9 [*DeviceA-Tunnel1] mpls te tunnel-id 1 [*DeviceA-Tunnel1] mpls te signal-protocol segment-routing [*DeviceA-Tunnel1] mpls te path explicit-path p1 [*DeviceA-Tunnel1] commit [~DeviceA-Tunnel1] quit
# After completing the configurations, run the display mpls te tunnel destination command on Device A. The command output shows that the SR-MPLS TE tunnel has been established.
[~DeviceA] display mpls te tunnel destination 6.6.6.9 * means the LSP is detour LSP ------------------------------------------------------------------------------- Ingress LsrId Destination LSPID In/OutLabel R Tunnel-name ------------------------------------------------------------------------------- 1.1.1.9 6.6.6.9 5 -/16020 I Tunnel1 ------------------------------------------------------------------------------- R: Role, I: Ingress, T: Transit, E: Egress
# Run the display mpls te tunnel-interface command on Device A. The command output shows information about the SR-MPLS TE tunnel.
[~DeviceA] display mpls te tunnel-interface Tunnel 1 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 : 1.1.1.9 Egress LSR ID: 6.6.6.9 Admin State : UP Oper State : UP Signaling Protocol : Segment-Routing FTid : 8193 Tie-Breaking Policy : None Metric Type : None Bfd Cap : None Reopt : Disabled Reopt Freq : - Inter-area Reopt : Disabled Auto BW : Disabled Threshold : - Current Collected BW: - Auto BW Freq : - Min BW : - Max BW : - Offload : Disabled Offload Freq : - Low Value : - High Value : - Readjust Value : - Offload Explicit Path Name: - Tunnel Group : Primary Interfaces Protected: - Excluded IP Address : - Referred LSP Count : 0 Primary Tunnel : - Pri Tunn Sum : - Backup Tunnel : - Group Status : Up Oam Status : None IPTN InLabel : - Tunnel BFD Status : - BackUp LSP Type : None BestEffort : - Secondary HopLimit : - BestEffort HopLimit : - Secondary Explicit Path Name: - Secondary Affinity Prop/Mask: 0x0/0x0 BestEffort Affinity Prop/Mask: - 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 : No Entropy Label : - Associated Tunnel Group ID: - Associated Tunnel Group Type: - Auto BW Remain Time : - Reopt Remain Time : - Segment-Routing Remote Label : - Metric Inherit IGP : None Binding Sid : - Reverse Binding Sid : - FRR Attr Source : - Is FRR degrade down : - Primary LSP ID : 1.1.1.9:5 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): 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 : p1 Hop Limit: - Record Route : - Record Label : - Route Pinning : - FRR Flag : - IdleTime Remain : - BFD Status : - Soft Preemption : - Reroute Flag : - Pce Flag : Normal Path Setup Type : EXPLICIT Create Modify LSP Reason: -
- Configure TI-LFA FRR.
# Configure Device B.
[~DeviceB] isis 1 [~DeviceB-isis-1] avoid-microloop frr-protected [*DeviceB-isis-1] avoid-microloop frr-protected rib-update-delay 5000 [*DeviceB-isis-1] avoid-microloop segment-routing [*DeviceB-isis-1] avoid-microloop segment-routing rib-update-delay 10000 [*DeviceB-isis-1] frr [*DeviceB-isis-1-frr] loop-free-alternate level-1 [*DeviceB-isis-1-frr] ti-lfa level-1 [*DeviceB-isis-1-frr] quit [*DeviceB-isis-1] quit [*DeviceB] commit
After completing the configurations, run the display isis route [ level-1 | level-2 ] [ process-id ] [ verbose ] command on Device B. The command output shows IS-IS TI-LFA FRR backup entries.
[~DeviceB] display isis route level-1 verbose Route information for ISIS(1) ----------------------------- ISIS(1) Level-1 Forwarding Table -------------------------------- IPV4 Dest : 1.1.1.9/32 Int. Cost : 10 Ext. Cost : NULL Admin Tag : - Src Count : 1 Flags : A/-/-/- Priority : Medium Age : 06:02:52 NextHop : Interface : ExitIndex : 10.1.1.1 GE0/1/0 0x0000000e Prefix-sid : 16010 Weight : 0 Flags : -/N/-/-/-/-/A/- SR NextHop : Interface : OutLabel : 10.1.1.1 GE0/1/0 3 IPV4 Dest : 2.2.2.9/32 Int. Cost : 0 Ext. Cost : NULL Admin Tag : - Src Count : 1 Flags : D/-/L/- Priority : - Age : 06:02:52 NextHop : Interface : ExitIndex : Direct Loop1 0x00000000 Prefix-sid : 16020 Weight : 0 Flags : -/N/-/-/-/-/A/L SR NextHop : Interface : OutLabel : Direct Loop1 - IPV4 Dest : 3.3.3.9/32 Int. Cost : 10 Ext. Cost : NULL Admin Tag : - Src Count : 1 Flags : A/-/-/- Priority : Medium Age : 00:03:21 NextHop : Interface : ExitIndex : 10.2.1.2 GE0/1/8 0x0000000a TI-LFA: Interface : GE0/1/16 NextHop : 10.5.1.2 LsIndex : 0x00000002 ProtectType: L Backup Label Stack (Top -> Bottom): {16040, 48141} Prefix-sid : 16030 Weight : 0 Flags : -/N/-/-/-/-/A/- SR NextHop : Interface : OutLabel : 10.2.1.2 GE0/1/8 3 TI-LFA: Interface : GE0/1/16 NextHop : 10.5.1.2 LsIndex : 0x00000002 ProtectType: L Backup Label Stack (Top -> Bottom): {16040, 48141} IPV4 Dest : 4.4.4.9/32 Int. Cost : 20 Ext. Cost : NULL Admin Tag : - Src Count : 1 Flags : A/-/-/- Priority : Medium Age : 00:03:21 NextHop : Interface : ExitIndex : 10.5.1.2 GE0/1/16 0x00000007 TI-LFA: Interface : GE0/1/8 NextHop : 10.2.1.2 LsIndex : 0x00000003 ProtectType: N Backup Label Stack (Top -> Bottom): {48142} Prefix-sid : 16040 Weight : 0 Flags : -/N/-/-/-/-/A/- SR NextHop : Interface : OutLabel : 10.5.1.2 GE0/1/16 16040 TI-LFA: Interface : GE0/1/8 NextHop : 10.2.1.2 LsIndex : 0x00000003 ProtectType: N Backup Label Stack (Top -> Bottom): {48142} IPV4 Dest : 5.5.5.9/32 Int. Cost : 10 Ext. Cost : NULL Admin Tag : - Src Count : 1 Flags : A/-/-/- Priority : Medium Age : 00:03:21 NextHop : Interface : ExitIndex : 10.5.1.2 GE0/1/16 0x00000007 TI-LFA: Interface : GE0/1/8 NextHop : 10.2.1.2 LsIndex : 0x00000003 ProtectType: L Backup Label Stack (Top -> Bottom): {48142} Prefix-sid : 16050 Weight : 0 Flags : -/N/-/-/-/-/A/- SR NextHop : Interface : OutLabel : 10.5.1.2 GE0/1/16 3 TI-LFA: Interface : GE0/1/8 NextHop : 10.2.1.2 LsIndex : 0x00000003 ProtectType: L Backup Label Stack (Top -> Bottom): {48142} IPV4 Dest : 6.6.6.9/32 Int. Cost : 20 Ext. Cost : NULL Admin Tag : - Src Count : 1 Flags : A/-/-/- Priority : Medium Age : 00:03:21 NextHop : Interface : ExitIndex : 10.5.1.2 GE0/1/16 0x00000007 TI-LFA: Interface : GE0/1/8 NextHop : 10.2.1.2 LsIndex : 0x00000003 ProtectType: L Backup Label Stack (Top -> Bottom): {48142} Prefix-sid : 16060 Weight : 0 Flags : -/N/-/-/-/-/A/- SR NextHop : Interface : OutLabel : 10.5.1.2 GE0/1/16 16060 TI-LFA: Interface : GE0/1/8 NextHop : 10.2.1.2 LsIndex : 0x00000003 ProtectType: L Backup Label Stack (Top -> Bottom): {48142} IPV4 Dest : 10.1.1.0/24 Int. Cost : 10 Ext. Cost : NULL Admin Tag : - Src Count : 2 Flags : D/-/L/- Priority : - Age : 06:02:52 NextHop : Interface : ExitIndex : Direct GE0/1/0 0x00000000 IPV4 Dest : 10.2.1.0/24 Int. Cost : 10 Ext. Cost : NULL Admin Tag : - Src Count : 2 Flags : D/-/L/- Priority : - Age : 06:02:52 NextHop : Interface : ExitIndex : Direct GE0/1/8 0x00000000 IPV4 Dest : 10.3.1.0/24 Int. Cost : 110 Ext. Cost : NULL Admin Tag : - Src Count : 2 Flags : A/-/-/- Priority : Low Age : 00:03:21 NextHop : Interface : ExitIndex : 10.2.1.2 GE0/1/8 0x0000000a TI-LFA: Interface : GE0/1/16 NextHop : 10.5.1.2 LsIndex : 0x00000003 ProtectType: L Backup Label Stack (Top -> Bottom): {} IPV4 Dest : 10.4.1.0/24 Int. Cost : 20 Ext. Cost : NULL Admin Tag : - Src Count : 2 Flags : A/-/-/- Priority : Low Age : 00:03:21 NextHop : Interface : ExitIndex : 10.5.1.2 GE0/1/16 0x00000007 TI-LFA: Interface : GE0/1/8 NextHop : 10.2.1.2 LsIndex : 0x00000003 ProtectType: L Backup Label Stack (Top -> Bottom): {48142} IPV4 Dest : 10.5.1.0/24 Int. Cost : 10 Ext. Cost : NULL Admin Tag : - Src Count : 2 Flags : D/-/L/- Priority : - Age : 00:03:44 NextHop : Interface : ExitIndex : Direct GE0/1/16 0x00000000 IPV4 Dest : 10.6.1.0/24 Int. Cost : 20 Ext. Cost : NULL Admin Tag : - Src Count : 2 Flags : A/-/-/- Priority : Low Age : 00:03:21 NextHop : Interface : ExitIndex : 10.5.1.2 GE0/1/16 0x00000007 TI-LFA: Interface : GE0/1/8 NextHop : 10.2.1.2 LsIndex : 0x00000003 ProtectType: L Backup Label Stack (Top -> Bottom): {48142} Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set, LP-Local Prefix-Sid Protect Type: L-Link Protect, N-Node Protect
- Verify the configuration.
# Run a tracert command on Device A to check the connectivity of the SR-MPLS TE tunnel to Device F. For example:
[~DeviceA] tracert lsp segment-routing te Tunnel 1 LSP Trace Route FEC: SEGMENT ROUTING TE TUNNEL IPV4 SESSION QUERY Tunnel1 , press CTRL_C to break. TTL Replier Time Type Downstream 0 Ingress 10.1.1.2/[16050 16060 ] 1 10.1.1.2 2 ms Transit 10.5.1.2/[3 ] 2 10.5.1.2 3 ms Transit 10.6.1.2/[3 ] 3 6.6.6.9 3 ms Egress
# Run the shutdown command on GE 0/1/16 of Device B to simulate a link fault between Device B and Device E.
[~DeviceB] interface gigabitethernet0/1/16 [~DeviceB-GigabitEthernet0/1/16] shutdown [*DeviceB-GigabitEthernet0/1/16] quit [*DeviceB] commit
# Run the tracert command on Device A again to check the connectivity of the SR-MPLS TE tunnel. For example:
[~DeviceA] tracert lsp segment-routing te Tunnel 1 LSP Trace Route FEC: SEGMENT ROUTING TE TUNNEL IPV4 SESSION QUERY Tunnel1 , press CTRL_C to break. TTL Replier Time Type Downstream 0 Ingress 10.1.1.2/[16050 16060 ] 1 10.1.1.2 3 ms Transit 10.2.1.2/[16050 ] 2 10.2.1.2 4 ms Transit 10.3.1.2/[16050 ] 3 10.3.1.2 4 ms Transit 10.4.1.2/[3 ] 4 10.4.1.2 3 ms Transit 10.6.1.2/[3 ] 5 6.6.6.9 5 ms Egress
The preceding command output shows that the SR-MPLS TE tunnel has been switched to the TI-LFA FRR backup path.
Configuration Files
Device A configuration file
# sysname DeviceA # mpls lsr-id 1.1.1.9 # mpls mpls te # explicit-path p1 next sid label 16020 type prefix next sid label 16050 type prefix next sid label 16060 type prefix # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0001.00 segment-routing mpls segment-routing global-block 16000 23999 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.1.1.1 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 1.1.1.9 255.255.255.255 isis enable 1 isis prefix-sid index 10 # interface Tunnel1 ip address unnumbered interface LoopBack1 tunnel-protocol mpls te destination 6.6.6.9 mpls te signal-protocol segment-routing mpls te tunnel-id 1 mpls te path explicit-path p1 # return
Device B configuration file
# sysname DeviceB # mpls lsr-id 2.2.2.9 # mpls mpls te # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0002.00 avoid-microloop frr-protected avoid-microloop frr-protected rib-update-delay 5000 segment-routing mpls segment-routing global-block 16000 23999 avoid-microloop segment-routing avoid-microloop segment-routing rib-update-delay 10000 frr loop-free-alternate level-1 ti-lfa level-1 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.1.1.2 255.255.255.0 isis enable 1 # interface GigabitEthernet0/1/8 undo shutdown ip address 10.2.1.1 255.255.255.0 isis enable 1 # interface GigabitEthernet0/1/16 undo shutdown ip address 10.5.1.1 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 2.2.2.9 255.255.255.255 isis enable 1 isis prefix-sid index 20 # return
Device C configuration file
# sysname DeviceC # mpls lsr-id 3.3.3.9 # mpls mpls te # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0003.00 segment-routing mpls segment-routing global-block 16000 23999 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.2.1.2 255.255.255.0 isis enable 1 # interface GigabitEthernet0/1/8 undo shutdown ip address 10.3.1.1 255.255.255.0 isis enable 1 isis cost 100 # interface LoopBack1 ip address 3.3.3.9 255.255.255.255 isis enable 1 isis prefix-sid index 30 # return
Device D configuration file
# sysname DeviceD # mpls lsr-id 4.4.4.9 # mpls mpls te # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0004.00 segment-routing mpls segment-routing global-block 16000 23999 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.3.1.2 255.255.255.0 isis enable 1 isis cost 100 # interface GigabitEthernet0/1/8 undo shutdown ip address 10.4.1.1 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 4.4.4.9 255.255.255.255 isis enable 1 isis prefix-sid index 40 # return
Device E configuration file
# sysname DeviceE # mpls lsr-id 5.5.5.9 # mpls mpls te # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0005.00 segment-routing mpls segment-routing global-block 16000 23999 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.6.1.1 255.255.255.0 isis enable 1 # interface GigabitEthernet0/1/8 undo shutdown ip address 10.4.1.2 255.255.255.0 isis enable 1 # interface GigabitEthernet0/1/16 undo shutdown ip address 10.5.1.2 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 5.5.5.9 255.255.255.255 isis enable 1 isis prefix-sid index 50 # return
Device F configuration file
# sysname DeviceF # mpls lsr-id 6.6.6.9 # mpls mpls te # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0006.00 segment-routing mpls segment-routing global-block 16000 23999 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.6.1.2 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 6.6.6.9 255.255.255.255 isis enable 1 isis prefix-sid index 60 # return