Example for Configuring the Shortcut Function for Static SRv6 TE Flow Groups
This section provides an example for configuring the shortcut function for static SRv6 TE flow groups.
Networking Requirements
On the network shown in Figure 1:
All devices are Level-1 devices that belong to IS-IS process 1.
- A bidirectional SRv6 TE flow group is established between PE1 and PE2.
It is required that IS-IS routes recurse to the SRv6 TE flow group between PE1 and PE2 for traffic forwarding.
Precautions
- To ensure that the shortcut function is correctly configured, the endpoint of the SRv6 TE flow group configured on the local device must be the same as the global TE IPv6 router ID advertised by IS-IS on the remote device.
- During SRv6 TE flow group configuration, ensure that the last SID of each SRv6 TE Policy in the SRv6 TE flow group has the USD capability. Otherwise, a forwarding error will occur.
- By default, an SRv6 TE flow group's metric is its IGP metric minus 1. If rules for the mapping between DSCP values and native IP links are configured for an SRv6 TE flow group, the SRv6 TE flow group's metric is equal to its IGP metric.
- In SRv6 TE Policy group shortcut scenarios, the Encaps or Insert-Encaps mode must be set for the SRv6 TE Policies in the corresponding SRv6 TE Policy group.
Configuration Roadmap
The configuration roadmap is as follows:
Enable IPv6 forwarding and configure an IPv6 address for each interface on PE1, P1, P2, and PE2.
Enable IS-IS, configure an IS-IS level, and specify a network entity title (NET) on PE1, P1, P2, and PE2.
- Configure SRv6 SIDs and enable IS-IS SRv6 on PE1, P1, and PE2.
Deploy SRv6 TE Policies between PE1 and PE2.
- Deploy an SRv6 TE flow group between PE1 and PE2.
- Configure the shortcut function for the SRv6 TE flow group on PE1 and PE2.
Data Preparation
To complete the configuration, you need the following data:
IPv6 address of each interface on PE1, P1, P2, and PE2
IS-IS process ID of PE1, P1, P2, and PE2
IS-IS level of PE1, P1, P2, and PE2
- Global TE IPv6 router ID of PE1 and PE2
Procedure
- Enable IPv6 forwarding and configure an IPv6 address for each interface.
# Configure PE1. The configurations of P1, P2, and PE2 are similar to the configuration of PE1. For configuration details, see Configuration Files in this section.
<HUAWEI> system-view [~HUAWEI] sysname PE1 [*HUAWEI] commit [~PE1] interface gigabitethernet 0/1/0 [~PE1-GigabitEthernet0/1/0] ipv6 enable [*PE1-GigabitEthernet0/1/0] ipv6 address 2001:DB8:11::1 96 [*PE1-GigabitEthernet0/1/0] quit [*PE1] interface gigabitethernet 0/1/16 [*PE1-GigabitEthernet0/1/16] ipv6 enable [*PE1-GigabitEthernet0/1/16] ipv6 address 2001:DB8:13::1 96 [*PE1-GigabitEthernet0/1/16] quit [*PE1] interface LoopBack 1 [*PE1-LoopBack1] ipv6 enable [*PE1-LoopBack1] ipv6 address 2001:DB8:1::1 128 [*PE1-LoopBack1] quit [*PE1] commit
- Configure IS-IS.
# Configure DeviceA.
[~DeviceA] isis 1 [*DeviceA-isis-1] is-level level-1 [*DeviceA-isis-1] cost-style wide [*DeviceA-isis-1] network-entity 10.0000.0000.0005.00 [*DeviceA-isis-1] ipv6 enable topology ipv6 [*DeviceA-isis-1] quit [*DeviceA] interface gigabitethernet 0/1/0 [*DeviceA-GigabitEthernet0/1/0] isis ipv6 enable 1 [*DeviceA-GigabitEthernet0/1/0] quit [*DeviceA] interface loopback1 [*DeviceA-LoopBack1] isis ipv6 enable 1 [*DeviceA-LoopBack1] commit [~DeviceA-LoopBack1] quit
# Configure PE1.
[~PE1] isis 1 [*PE1-isis-1] is-level level-1 [*PE1-isis-1] cost-style wide [*PE1-isis-1] network-entity 10.0000.0000.0001.00 [*PE1-isis-1] ipv6 enable topology ipv6 [*PE1-isis-1] quit [*PE1] interface gigabitethernet 0/1/0 [*PE1-GigabitEthernet0/1/0] isis ipv6 enable 1 [*PE1-GigabitEthernet0/1/0] quit [*PE1] interface gigabitethernet 0/1/16 [*PE1-GigabitEthernet0/1/16] isis ipv6 enable 1 [*PE1-GigabitEthernet0/1/16] quit [*PE1] interface loopback1 [*PE1-LoopBack1] isis ipv6 enable 1 [*PE1-LoopBack1] commit [~PE1-LoopBack1] quit
# Configure P1.
[~P1] isis 1 [*P1-isis-1] is-level level-1 [*P1-isis-1] cost-style wide [*P1-isis-1] network-entity 10.0000.0000.0002.00 [*P1-isis-1] ipv6 enable topology ipv6 [*P1-isis-1] quit [*P1] interface gigabitethernet 0/1/0 [*P1-GigabitEthernet0/1/0] isis ipv6 enable 1 [*P1-GigabitEthernet0/1/0] quit [*P1] interface gigabitethernet 0/1/8 [*P1-GigabitEthernet0/1/8] isis ipv6 enable 1 [*P1-GigabitEthernet0/1/8] quit [*P1] interface loopback1 [*P1-LoopBack1] isis ipv6 enable 1 [*P1-LoopBack1] commit [~P1-LoopBack1] quit
# Configure PE2.
[~PE2] isis 1 [*PE2-isis-1] is-level level-1 [*PE2-isis-1] cost-style wide [*PE2-isis-1] network-entity 10.0000.0000.0003.00 [*PE2-isis-1] ipv6 enable topology ipv6 [*PE2-isis-1] quit [*PE2] interface gigabitethernet 0/1/0 [*PE2-GigabitEthernet0/1/0] isis ipv6 enable 1 [*PE2-GigabitEthernet0/1/0] quit [*PE2] interface gigabitethernet 0/1/16 [*PE2-GigabitEthernet0/1/16] isis ipv6 enable 1 [*PE2-GigabitEthernet0/1/16] quit [*PE2] interface loopback1 [*PE2-LoopBack1] isis ipv6 enable 1 [*PE2-LoopBack1] commit [~PE2-LoopBack1] quit
# Configure P2.
[~P2] isis 1 [*P2-isis-1] is-level level-1 [*P2-isis-1] cost-style wide [*P2-isis-1] network-entity 10.0000.0000.0004.00 [*P2-isis-1] ipv6 enable topology ipv6 [*P2-isis-1] quit [*P2] interface gigabitethernet 0/1/0 [*P2-GigabitEthernet0/1/0] isis ipv6 enable 1 [*P2-GigabitEthernet0/1/0] quit [*P2] interface gigabitethernet 0/1/8 [*P2-GigabitEthernet0/1/8] isis ipv6 enable 1 [*P2-GigabitEthernet0/1/8] quit [*P2] interface loopback1 [*P2-LoopBack1] isis ipv6 enable 1 [*P2-LoopBack1] commit [~P2-LoopBack1] quit
# Configure DeviceB.
[~DeviceB] isis 1 [*DeviceB-isis-1] is-level level-1 [*DeviceB-isis-1] cost-style wide [*DeviceB-isis-1] network-entity 10.0000.0000.0006.00 [*DeviceB-isis-1] ipv6 enable topology ipv6 [*DeviceB-isis-1] quit [*DeviceB] interface gigabitethernet 0/1/0 [*DeviceB-GigabitEthernet0/1/0] isis ipv6 enable 1 [*DeviceB-GigabitEthernet0/1/0] quit [*DeviceB] interface loopback1 [*DeviceB-LoopBack1] isis ipv6 enable 1 [*DeviceB-LoopBack1] commit [~DeviceB-LoopBack1] quit
After the configuration is complete, run the display isis peer command to check whether IS-IS has been configured successfully.
- Configure SRv6 SIDs.
# Configure PE1.
[~PE1] segment-routing ipv6 [*PE1-segment-routing-ipv6] encapsulation source-address 2001:DB8:1::1 [*PE1-segment-routing-ipv6] locator as1 ipv6-prefix 2001:DB8:100:: 64 static 32 [*PE1-segment-routing-ipv6-locator] opcode ::100 end psp-usp-usd [*PE1-segment-routing-ipv6-locator] quit [*PE1-segment-routing-ipv6] quit [*PE1] isis 1 [*PE1-isis-1] segment-routing ipv6 locator as1 auto-sid-disable [*PE1-isis-1] commit [~PE1-isis-1] quit
# Configure P1.
[~P1] segment-routing ipv6 [*P1-segment-routing-ipv6] encapsulation source-address 2001:DB8:2::2 [*P1-segment-routing-ipv6] locator as1 ipv6-prefix 2001:DB8:200:: 64 static 32 [*P1-segment-routing-ipv6-locator] opcode ::100 end psp-usp-usd [*P1-segment-routing-ipv6-locator] quit [*P1-segment-routing-ipv6] quit [*P1] isis 1 [*P1-isis-1] segment-routing ipv6 locator as1 auto-sid-disable [*P1-isis-1] commit [~P1-isis-1] quit
# Configure PE2.
[~PE2] segment-routing ipv6 [*PE2-segment-routing-ipv6] encapsulation source-address 2001:DB8:3::3 [*PE2-segment-routing-ipv6] locator as1 ipv6-prefix 2001:DB8:300:: 64 static 32 [*PE2-segment-routing-ipv6-locator] opcode ::100 end psp-usp-usd [*PE2-segment-routing-ipv6-locator] quit [*PE2-segment-routing-ipv6] quit [*PE2] isis 1 [*PE2-isis-1] segment-routing ipv6 locator as1 auto-sid-disable [*PE2-isis-1] commit [~PE2-isis-1] quit
# Configure P2.
[~P2] segment-routing ipv6 [*P2-segment-routing-ipv6] encapsulation source-address 2001:DB8:4::4 [*P2-segment-routing-ipv6] locator as1 ipv6-prefix 2001:DB8:400:: 64 static 32 [*P2-segment-routing-ipv6-locator] opcode ::100 end psp-usp-usd [*P2-segment-routing-ipv6-locator] quit [*P2-segment-routing-ipv6] quit [*P2] isis 1 [*P2-isis-1] segment-routing ipv6 locator as1 auto-sid-disable [*P2-isis-1] commit [~P2-isis-1] quit
Run the display segment-routing ipv6 local-sid end forwarding command to check information about the SRv6 local SID table.
[~PE1] display segment-routing ipv6 local-sid end forwarding My Local-SID End Forwarding Table --------------------------------- SID : 2001:DB8:100::100/128 FuncType : End Flavor : PSP USP USD LocatorName : as1 LocatorID : 1 ProtocolType: STATIC ProcessID : -- UpdateTime : 2021-05-05 09:24:18.785 Total SID(s): 1 [~P1] display segment-routing ipv6 local-sid end forwarding My Local-SID End Forwarding Table --------------------------------- SID : 2001:DB8:200::100/128 FuncType : End Flavor : PSP USP USD LocatorName : as1 LocatorID : 1 ProtocolType: STATIC ProcessID : -- UpdateTime : 2021-05-05 09:29:22.633 Total SID(s): 1 [~PE2] display segment-routing ipv6 local-sid end forwarding My Local-SID End Forwarding Table --------------------------------- SID : 2001:DB8:300::100/128 FuncType : End Flavor : PSP USP USD LocatorName : as1 LocatorID : 1 ProtocolType: STATIC ProcessID : -- UpdateTime : 2021-05-05 09:36:31.017 Total SID(s): 1 [~P2] display segment-routing ipv6 local-sid end forwarding My Local-SID End Forwarding Table --------------------------------- SID : 2001:DB8:400::100/128 FuncType : End Flavor : PSP USP USD LocatorName : as1 LocatorID : 1 ProtocolType: STATIC ProcessID : -- UpdateTime : 2021-05-05 09:39:22.633 Total SID(s): 1
- Configure SRv6 TE Policies.
# Configure PE1.
[~PE1] te ipv6-router-id 2001:DB8:1::1 [*PE1] segment-routing ipv6 [*PE1-segment-routing-ipv6] segment-list list1 [*PE1-segment-routing-ipv6-segment-list-list1] index 5 sid ipv6 2001:DB8:200::100 [*PE1-segment-routing-ipv6-segment-list-list1] index 10 sid ipv6 2001:DB8:300::100 [*PE1-segment-routing-ipv6-segment-list-list1] quit [*PE1-segment-routing-ipv6] segment-list list2 [*PE1-segment-routing-ipv6-segment-list-list2] index 5 sid ipv6 2001:DB8:400::100 [*PE1-segment-routing-ipv6-segment-list-list2] index 10 sid ipv6 2001:DB8:300::100 [*PE1-segment-routing-ipv6-segment-list-list2] quit [*PE1-segment-routing-ipv6] srv6-te-policy locator as1 [*PE1-segment-routing-ipv6] srv6-te policy policy1 endpoint 2001:DB8:3::3 color 10 [*PE1-segment-routing-ipv6-policy-policy1] encapsulation-mode encaps [*PE1-segment-routing-ipv6-policy-policy1] candidate-path preference 100 [*PE1-segment-routing-ipv6-policy-policy1-path] segment-list list1 [*PE1-segment-routing-ipv6-policy-policy1-path] quit [*PE1-segment-routing-ipv6-policy-policy1] quit [*PE1-segment-routing-ipv6] srv6-te policy policy2 endpoint 2001:DB8:3::3 color 20 [*PE1-segment-routing-ipv6-policy-policy2] encapsulation-mode encaps [*PE1-segment-routing-ipv6-policy-policy2] candidate-path preference 100 [*PE1-segment-routing-ipv6-policy-policy2-path] segment-list list2 [*PE1-segment-routing-ipv6-policy-policy2-path] commit [~PE1-segment-routing-ipv6-policy-policy2-path] quit [~PE1-segment-routing-ipv6-policy-policy2] quit [~PE1-segment-routing-ipv6] quit
# Configure PE2.
[~PE2] te ipv6-router-id 2001:DB8:3::3 [*PE2] segment-routing ipv6 [*PE2-segment-routing-ipv6] segment-list list1 [*PE2-segment-routing-ipv6-segment-list-list1] index 5 sid ipv6 2001:DB8:200::100 [*PE2-segment-routing-ipv6-segment-list-list1] index 10 sid ipv6 2001:DB8:100::100 [*PE2-segment-routing-ipv6-segment-list-list1] quit [*PE2-segment-routing-ipv6] segment-list list2 [*PE2-segment-routing-ipv6-segment-list-list2] index 5 sid ipv6 2001:DB8:400::100 [*PE2-segment-routing-ipv6-segment-list-list2] index 10 sid ipv6 2001:DB8:100::100 [*PE2-segment-routing-ipv6-segment-list-list2] quit [*PE2-segment-routing-ipv6] srv6-te-policy locator as1 [*PE2-segment-routing-ipv6] srv6-te policy policy1 endpoint 2001:DB8:1::1 color 10 [*PE2-segment-routing-ipv6-policy-policy1] encapsulation-mode encaps [*PE2-segment-routing-ipv6-policy-policy1] candidate-path preference 100 [*PE2-segment-routing-ipv6-policy-policy1-path] segment-list list1 [*PE2-segment-routing-ipv6-policy-policy1-path] quit [*PE2-segment-routing-ipv6-policy-policy1] quit [*PE2-segment-routing-ipv6] srv6-te policy policy2 endpoint 2001:DB8:1::1 color 20 [*PE2-segment-routing-ipv6-policy-policy2] encapsulation-mode encaps [*PE2-segment-routing-ipv6-policy-policy2] candidate-path preference 100 [*PE2-segment-routing-ipv6-policy-policy2-path] segment-list list2 [*PE2-segment-routing-ipv6-policy-policy2-path] commit [~PE2-segment-routing-ipv6-policy-policy2-path] quit [~PE2-segment-routing-ipv6-policy-policy2] quit [~PE2-segment-routing-ipv6] quit
After the configuration is complete, run the display srv6-te policy command to check SRv6 TE Policy information.
The following example uses the command output on PE1.
[~PE1] display srv6-te policy PolicyName : policy1 Color : 10 Endpoint : 2001:DB8:3::3 TunnelId : 1 Binding SID : - TunnelType : SRv6-TE Policy DelayTimerRemain : - Policy State : Up State Change Time : 2021-05-05 09:24:24 Admin State : Up Traffic Statistics : Disable Backup Hot-Standby : Disable BFD : Disable Interface Index : - Interface Name : - Interface State : - Encapsulation Mode : Encaps Candidate-path Count : 1 Candidate-path Preference : 100 Path State : Active Path Type : Primary Protocol-Origin : Configuration(30) Originator : 0, 0.0.0.0 Discriminator : 100 Binding SID : 2001:DB8:10::900 GroupId : 1 Policy Name : policy1 Template ID : 0 Path Verification : Disable DelayTimerRemain : - Network Slice ID : - Compute Source : - Segment-List Count : 1 Segment-List : list1 Segment-List ID : 1 XcIndex : 1 List State : Up DelayTimerRemain : - Verification State : - SuppressTimeRemain : - PMTU : 9600 Active PMTU : 9600 Weight : 1 BFD State : - Network Slice ID : - Compute Source : - SID : 2001:DB8:20::100 2001:DB8:30::100 PolicyName : policy2 Color : 20 Endpoint : 2001:DB8:3::3 TunnelId : 2 Binding SID : - TunnelType : SRv6-TE Policy DelayTimerRemain : - Policy State : Up State Change Time : 2021-05-05 09:24:24 Admin State : Up Traffic Statistics : Disable Backup Hot-Standby : Disable BFD : Disable Interface Index : - Interface Name : - Interface State : - Encapsulation Mode : Encaps Candidate-path Count : 1 Candidate-path Preference : 100 Path State : Active Path Type : Primary Protocol-Origin : Configuration(30) Originator : 0, 0.0.0.0 Discriminator : 100 Binding SID : 2001:DB8:10::901 GroupId : 2 Policy Name : policy2 Template ID : 0 Path Verification : Disable DelayTimerRemain : - Network Slice ID : - Compute Source : - Segment-List Count : 1 Segment-List : list2 Segment-List ID : 2 XcIndex : 2 List State : Up DelayTimerRemain : - Verification State : - SuppressTimeRemain : - PMTU : 9600 Active PMTU : 9600 Weight : 1 BFD State : - Network Slice ID : - Compute Source : - SID : 2001:DB8:40::100 2001:DB8:30::100 - Configure an SRv6 TE flow group.
Once configured, the SRv6 TE flow group contains multiple SRv6 TE Policies with the same endpoint but different color values.
In this example, traffic with DSCP values ranging from 1 to 20 is forwarded through policy1, and other traffic is forwarded through policy2 by default.
# Configure PE1.
[~PE1] segment-routing ipv6 [~PE1-segment-routing-ipv6] srv6-te flow-group fg1 [*PE1-segment-routing-ipv6-flow-group-fg1] endpoint 2001:DB8:3::3 [*PE1-segment-routing-ipv6-flow-group-fg1] match-type dscp [*PE1-segment-routing-ipv6-flow-group-fg1-dscp] index 10 dscp 1 to 20 match srv6-te-policy color 10 [*PE1-segment-routing-ipv6-flow-group-fg1-dscp] default match srv6-te-policy color 20 [*PE1-segment-routing-ipv6-flow-group-fg1-dscp] quit [*PE1-segment-routing-ipv6-flow-group-fg1] quit [*PE1-segment-routing-ipv6] commit [~PE1-segment-routing-ipv6] quit
# Configure PE2.
[~PE2] segment-routing ipv6 [~PE2-segment-routing-ipv6] srv6-te flow-group fg1 [*PE2-segment-routing-ipv6-flow-group-fg1] endpoint 2001:DB8:1::1 [*PE2-segment-routing-ipv6-flow-group-fg1] match-type dscp [*PE2-segment-routing-ipv6-flow-group-fg1-dscp] index 10 dscp 1 to 20 match srv6-te-policy color 10 [*PE2-segment-routing-ipv6-flow-group-fg1-dscp] default match srv6-te-policy color 20 [*PE2-segment-routing-ipv6-flow-group-fg1-dscp] quit [*PE2-segment-routing-ipv6-flow-group-fg1] quit [*PE2-segment-routing-ipv6] commit [~PE2-segment-routing-ipv6] quit
After the configuration is complete, run the display srv6-te flow-group command to check the SRv6 TE flow group status.
The following example uses the command output on PE1.
[~PE1] display srv6-te flow-group SRv6-TE Flow Group Information ------------------------------------------------------------------------------------ Group Name : fg1 Color : - Endpoint : 2001:DB8:3::3 Group Tunnel ID : 3 Group Tunnel Type : SRv6-TE Flow Group Group Tunnel State : Up State Change Time : 2021-06-11 01:24:31 Interface Index : 27 Interface Name : SRv6TE-FlowGroup-2 Interface State : Up Usd Capability : True Delay Timer Remain : - UP/ALL Num : 2/2 Index : - AfType : - DSCP : Default Match Tunnel : SRv6-TE Policy State : Up Color : 20 Tunnel Id : 2 Usd Capability : True Index : 10 AfType : - DSCP : 1-20 Match Tunnel : SRv6-TE Policy State : Up Color : 10 Tunnel Id : 1 Usd Capability : TrueAn SRv6 TE flow group can be used as a shortcut interface by an IGP only when Interface State is displayed as Up.
The mapping between DSCP values and SRv6 TE Policies takes effect only when State is displayed as Up.
- Configure the shortcut function for the SRv6 TE flow group.
# Configure PE1.
[~PE1] ip ipv6-prefix p1 permit 2001:DB8:20:: 96 [*PE1] ip ipv6-prefix p1 permit 2001:DB8:6::6 128 [*PE1] route-policy rp1 permit node 10 [*PE1-route-policy] if-match ipv6 address prefix-list p1 [*PE1-route-policy] quit [*PE1] segment-routing ipv6 [*PE1-segment-routing-ipv6] srv6-te flow-group fg1 [*PE1-segment-routing-ipv6-flow-group-fg1] igp shortcut isis route-policy rp1 [*PE1-segment-routing-ipv6-flow-group-fg1] isis ipv6 enable 1 [*PE1-segment-routing-ipv6-flow-group-fg1] quit [*PE1-segment-routing-ipv6] commit [~PE1-segment-routing-ipv6] quit
# Configure PE2.
[~PE2] ip ipv6-prefix p1 permit 2001:DB8:10:: 96 [*PE2] ip ipv6-prefix p1 permit 2001:DB8:5::5 128 [*PE2] route-policy rp1 permit node 10 [*PE2-route-policy] if-match ipv6 address prefix-list p1 [*PE2-route-policy] quit [*PE2] segment-routing ipv6 [*PE2-segment-routing-ipv6] srv6-te flow-group fg1 [*PE2-segment-routing-ipv6-flow-group-fg1] igp shortcut isis route-policy rp1 [*PE2-segment-routing-ipv6-flow-group-fg1] isis ipv6 enable 1 [*PE2-segment-routing-ipv6-flow-group-fg1] quit [*PE2-segment-routing-ipv6] commit [~PE2-segment-routing-ipv6] quit
After the configuration is complete, run the display isis route ipv6 command to check IS-IS routing information.
The following example uses the command output on PE1.
[~PE1] display isis route ipv6 Route information for ISIS(1) ----------------------------- ISIS(1) Level-1 Forwarding Table -------------------------------- IPV6 Dest. ExitInterface NextHop Cost Flags -------------------------------------------------------------------------------- 2001:DB8:1::1/128 Loop1 Direct 0 D/-/L/- 2001:DB8:2::2/128 GE0/1/0 FE80::3AB0:9EFF:FE31:307 10 A/-/-/- 2001:DB8:3::3/128 GE0/1/0 FE80::3AB0:9EFF:FE31:307 10 A/-/-/- 2001:DB8:5::5/128 GE0/1/8 FE80::3AB0:9EFF:FE21:300 10 A/-/-/- 2001:DB8:6::6/128 SRv6TE-FlowGroup-2 :: 29 A/S/-/- 2001:DB8:10::/96 GE0/1/8 Direct 10 D/-/L/- 2001:DB8:11::/96 GE0/1/0 Direct 10 D/-/L/- 2001:DB8:12::/96 GE0/1/0 FE80::3AB0:9EFF:FE31:307 20 A/-/-/- 2001:DB8:20::/96 SRv6TE-FlowGroup-2 :: 29 A/S/-/- 2001:DB8:100::/64 NULL0 - 0 A/-/L/- 2001:DB8:200::/64 GE0/1/0 FE80::3AB0:9EFF:FE31:307 10 A/-/-/- 2001:DB8:300::/64 GE0/1/0 FE80::3AB0:9EFF:FE31:307 19 A/-/-/- 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 ProtectRun the display ipv6 routing-table brief command to check IPv6 routing information.
The following example uses the command output on PE1.
[~PE1] display ipv6 routing-table brief Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route ------------------------------------------------------------------------------ Routing Table : _public_ Destinations : 18 Routes : 18 Format : Destination/Mask Protocol Nexthop Interface ------------------------------------------------------------------------------ ::1/128 Direct ::1 InLoopBack0 ::FFFF:127.0.0.0/104 Direct ::FFFF:127.0.0.1 InLoopBack0 ::FFFF:127.0.0.1/128 Direct ::1 InLoopBack0 2001:DB8:1::1/128 Direct ::1 LoopBack1 2001:DB8:2::2/128 ISIS-L1 FE80::3AB0:9EFF:FE31:307 GE0/1/0 2001:DB8:3::3/128 ISIS-L1 FE80::3AB0:9EFF:FE31:307 GE0/1/0 2001:DB8:5::5/128 ISIS-L1 FE80::3AB0:9EFF:FE21:300 GE0/1/8 2001:DB8:6::6/128 ISIS-L1 :: SRv6TE-FlowGroup-2 2001:DB8:10::/96 Direct 2001:DB8:10::1 GE0/1/8 2001:DB8:10::1/128 Direct ::1 GE0/1/8 2001:DB8:11::/96 Direct 2001:DB8:11::1 GE0/1/0 2001:DB8:11::1/128 Direct ::1 GE0/1/0 2001:DB8:12::/96 ISIS-L1 FE80::3AB0:9EFF:FE31:307 GE0/1/0 2001:DB8:20::/96 ISIS-L1 :: SRv6TE-FlowGroup-2 2001:DB8:100::/64 ISIS-L1 :: NULL0 2001:DB8:200::/64 ISIS-L1 FE80::3AB0:9EFF:FE31:307 GE0/1/0 2001:DB8:300::/64 ISIS-L1 FE80::3AB0:9EFF:FE31:307 GE0/1/0 FE80::/10 Direct :: NULL0Because the IGP metric value of the shortcut route of the SRv6 TE flow group is less than that of a common route, the outbound interface of the route 2001:DB8:6::6/128 on PE1 is the SRv6 TE flow group.
Configuration Files
PE1 configuration file
# sysname PE1 # te ipv6-router-id 2001:DB8:1::1 # segment-routing ipv6 encapsulation source-address 2001:DB8:1::1 locator as1 ipv6-prefix 2001:DB8:100:: 64 static 32 opcode ::100 end psp-usp-usd srv6-te-policy locator as1 segment-list list1 index 5 sid ipv6 2001:DB8:200::100 index 10 sid ipv6 2001:DB8:300::100 segment-list list2 index 5 sid ipv6 2001:DB8:400::100 index 10 sid ipv6 2001:DB8:300::100 srv6-te policy policy1 endpoint 2001:DB8:3::3 color 10 encapsulation-mode encaps candidate-path preference 100 segment-list list1 srv6-te policy policy2 endpoint 2001:DB8:3::3 color 20 encapsulation-mode encaps candidate-path preference 100 segment-list list1 srv6-te flow-group fg1 endpoint 2001:DB8:3::3 igp shortcut isis route-policy rp1 isis ipv6 enable 1 match-type dscp index 10 dscp 1 to 20 match srv6-te-policy color 10 default match srv6-te-policy color 20 # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0001.00 # ipv6 enable topology ipv6 segment-routing ipv6 locator as1 auto-sid-disable # # interface GigabitEthernet0/1/0 undo shutdown ipv6 enable ipv6 address 2001:DB8:11::1/96 isis ipv6 enable 1 # interface GigabitEthernet0/1/8 undo shutdown ipv6 enable ipv6 address 2001:DB8:10::1/96 isis ipv6 enable 1 # interface GigabitEthernet0/1/16 undo shutdown ipv6 enable ipv6 address 2001:DB8:13::1/96 isis ipv6 enable 1 # interface LoopBack1 ipv6 enable ipv6 address 2001:DB8:1::1/128 isis ipv6 enable 1 # route-policy rp1 permit node 10 if-match ipv6 address prefix-list p1 # ip ipv6-prefix p1 index 10 permit 2001:DB8:20:: 96 ip ipv6-prefix p1 index 20 permit 2001:DB8:6::6 128 # return
P1 configuration file
# sysname P1 # segment-routing ipv6 encapsulation source-address 2001:DB8:2::2 locator as1 ipv6-prefix 2001:DB8:200:: 64 static 32 opcode ::100 end psp-usp-usd # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0002.00 # ipv6 enable topology ipv6 segment-routing ipv6 locator as1 auto-sid-disable # # interface GigabitEthernet0/1/0 undo shutdown ipv6 enable ipv6 address 2001:DB8:11::2/96 isis ipv6 enable 1 # interface GigabitEthernet0/1/8 undo shutdown ipv6 enable ipv6 address 2001:DB8:12::1/96 isis ipv6 enable 1 # interface LoopBack1 ipv6 enable ipv6 address 2001:DB8:2::2/128 isis ipv6 enable 1 # return
PE2 configuration file
# sysname PE2 # te ipv6-router-id 2001:DB8:3::3 # segment-routing ipv6 encapsulation source-address 2001:DB8:3::3 locator as1 ipv6-prefix 2001:DB8:300:: 64 static 32 opcode ::100 end psp-usp-usd srv6-te-policy locator as1 segment-list list1 index 5 sid ipv6 2001:DB8:200::100 index 10 sid ipv6 2001:DB8:100::100 segment-list list2 index 5 sid ipv6 2001:DB8:400::100 index 10 sid ipv6 2001:DB8:100::100 srv6-te policy policy1 endpoint 2001:DB8:1::1 color 10 encapsulation-mode encaps candidate-path preference 100 segment-list list1 srv6-te policy policy2 endpoint 2001:DB8:1::1 color 20 encapsulation-mode encaps candidate-path preference 100 segment-list list1 srv6-te flow-group fg1 endpoint 2001:DB8:1::1 igp shortcut isis route-policy rp1 isis ipv6 enable 1 match-type dscp index 10 dscp 1 to 20 match srv6-te-policy color 10 default match srv6-te-policy color 20 # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0003.00 # ipv6 enable topology ipv6 segment-routing ipv6 locator as1 auto-sid-disable # # interface GigabitEthernet0/1/0 undo shutdown ipv6 enable ipv6 address 2001:DB8:12::2/96 isis ipv6 enable 1 # interface GigabitEthernet0/1/8 undo shutdown ipv6 enable ipv6 address 2001:DB8:20::1/96 isis ipv6 enable 1 # interface GigabitEthernet0/1/16 undo shutdown ipv6 enable ipv6 address 2001:DB8:14::2/96 isis ipv6 enable 1 # interface LoopBack1 ipv6 enable ipv6 address 2001:DB8:3::3/128 isis ipv6 enable 1 # route-policy rp1 permit node 10 if-match ipv6 address prefix-list p1 # ip ipv6-prefix p1 index 10 permit 2001:DB8:10:: 96 ip ipv6-prefix p1 index 20 permit 2001:DB8:5::5 128 # return
P2 configuration file
# sysname P2 # segment-routing ipv6 encapsulation source-address 2001:DB8:4::4 locator as1 ipv6-prefix 2001:DB8:400:: 64 static 32 opcode ::100 end psp-usp-usd # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0004.00 # ipv6 enable topology ipv6 # # interface GigabitEthernet0/1/0 undo shutdown ipv6 enable ipv6 address 2001:DB8:13::2/96 isis ipv6 enable 1 # interface GigabitEthernet0/1/8 undo shutdown ipv6 enable ipv6 address 2001:DB8:14::1/96 isis ipv6 enable 1 # interface LoopBack1 ipv6 enable ipv6 address 2001:DB8:4::4/128 isis ipv6 enable 1 # return
DeviceA configuration file
# sysname DeviceA # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0005.00 # ipv6 enable topology ipv6 # # interface GigabitEthernet0/1/0 undo shutdown ipv6 enable ipv6 address 2001:DB8:10::2/96 isis ipv6 enable 1 # interface LoopBack1 ipv6 enable ipv6 address 2001:DB8:5::5/128 isis ipv6 enable 1 # returnDeviceB configuration file
# sysname DeviceB # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0006.00 # ipv6 enable topology ipv6 # # interface GigabitEthernet0/1/0 undo shutdown ipv6 enable ipv6 address 2001:DB8:20::2/96 isis ipv6 enable 1 # interface LoopBack1 ipv6 enable ipv6 address 2001:DB8:6::6/128 isis ipv6 enable 1 # return