1) Only IPv4, only ipv4 node-segment;
2) No IPv6, no ISIS multi-topology
From the above configuration, we can observe:
- The basic ISIS-SR configuration is quite simple:
- enable "segment-routing mpls" under router isis to attach SR info to ISIS LSA;
- Specify the loopback0 interface with a globally unique node-segment index.
- ISIS-SR calculates the node-segment label = mpls label range base + index, so the routers in whole domain use the same label. This is an important characteristic of SR, for anycast.
To verify the SR setup, you can use the following CLI commands:
- show mpls label ranges
- show isis segment-routing
- show isis database PE2.00-00 detail !PE2.00-00 is id
- show mpls lfib route
- show mpls segment-routing bindings
- show platform jericho mpls route
Detailed output of PE1:
PE1#show mpls label ranges
Start End Size Usage
------------------------------------------------
0 15 16 reserved
16 99999 99984 static mpls
100000 116383 16384 ldp (dynamic)
116384 132767 16384 pseudowire (dynamic)
132768 149151 16384 bgp (dynamic)
149152 165535 16384 isis (dynamic)
165536 362143 196608 free (dynamic)
362144 899999 537856 unassigned
900000 965535 65536 isis-sr <<< default ISIS-SR range
900000 965535 65536 bgp-sr
965536 1031071 65536 srlb
1031072 1036287 5216 unassigned
1036288 1048575 12288 l2evpn
PE1#show isis segment-routing
System ID: PE1 Instance: sr
SR supported Data-plane: MPLS SR Router ID: 1.1.1.1
SR Global Block( SRGB ): Base: 900000 Size: 65536
Adj-SID allocation mode: SR-adjacencies
Adj-SID allocation pool: Base: 149152 Size: 16384
All Prefix Segments have : P:0 E:0 V:0 L:0
IS-IS Reachability Algorithm : SPF (0)
Number of IS-IS segment routing capable peers: 3
Self-Originated Segment Statistics:
Node-Segments : 1
Prefix-Segments : 0
Proxy-Node-Segments : 0
Adjacency Segments : 1
PE1#show isis database PE2.00-00 detail
IS-IS Instance: sr VRF: default
IS-IS Level 2 Link State Database
LSPID Seq Num Cksum Life IS Flags
PE2.00-00 12 57553 1049 L2 <>
NLPID: 0xCC(IPv4)
Hostname: PE2
Area address: 49.0001
Interface address: 4.4.4.4
Interface address: 10.3.4.4
IS Neighbor : P2.11 Metric: 10
LAN-Adj-sid: 100000 flags: [ L V ] weight: 0 system ID: 0000.0000.3333
Reachability : 4.4.4.4/32 Metric: 10 Type: 1 Up
SR Prefix-SID: 4 Flags: [ N ] Algorithm: 0
Reachability : 10.3.4.0/24 Metric: 10 Type: 1 Up
Router Capabilities: Router Id: 4.4.4.4 Flags: [ ]
SR Local Block:
SRLB Base: 965536 Range: 65536
Area leader priority: 250 algorithm: 0
SR Capability: Flags: [ I ]
SRGB Base: 900000 Range: 65536
PE1#show mpls lfib route
MPLS forwarding table (Label [metric] Vias) - 4 routes
MPLS next-hop resolution allow default route: False
Via Type Codes:
M - MPLS via, P - Pseudowire via,
I - IP lookup via, V - VLAN via,
VA - EVPN VLAN aware via, ES - EVPN ethernet segment via,
VF - EVPN VLAN flood via, AF - EVPN VLAN aware flood via,
NG - Nexthop group via
Source Codes:
G - gRIBI, S - Static MPLS route,
B2 - BGP L2 EVPN, B3 - BGP L3 VPN,
R - RSVP, LP - LDP pseudowire,
L - LDP, M - MLDP,
IP - IS-IS SR prefix segment, IA - IS-IS SR adjacency segment,
IL - IS-IS SR segment to LDP, LI - LDP to IS-IS SR segment,
BL - BGP LU, ST - SR TE policy,
DE - Debug LFIB
IA 149152 [1]
via M, 10.1.2.2, pop
payload autoDecide, ttlMode uniform, apply egress-acl
interface Ethernet2/4
IP 900002 [1], 2.2.2.2/32
via M, 10.1.2.2, pop
payload autoDecide, ttlMode uniform, apply egress-acl
interface Ethernet2/4
IP 900003 [1], 3.3.3.3/32
via M, 10.1.2.2, forward
payload autoDecide, ttlMode uniform, apply egress-acl
interface Ethernet2/4
IP 900004 [1], 4.4.4.4/32
via M, 10.1.2.2, forward
payload autoDecide, ttlMode uniform, apply egress-acl
interface Ethernet2/4
PE1#show mpls segment-routing bindings
1.1.1.1/32
Local binding: Label: imp-null
Remote binding: Peer ID: 0000.0000.2222, Label: 900001
2.2.2.2/32
Local binding: Label: 900002
Remote binding: Peer ID: 0000.0000.2222, Label: imp-null
3.3.3.3/32
Local binding: Label: 900003
Remote binding: Peer ID: 0000.0000.2222, Label: 900003
4.4.4.4/32
Local binding: Label: 900004
Remote binding: Peer ID: 0000.0000.2222, Label: 900004
PE1#show platform jericho mpls route
D - ECMP is divergent across switching chips
---------------------------------------------------------------------------------------------
| Mpls Table |
|---------------------------------------------------------------------------------------------|
| label | Destination | VID | MAC Code | egress action | FEC |olif | arp | remark |
|---------------------------------------------------------------------------------------------|
|149152 |Et2/4 |1027 | 44:4c:a8:97:8c:51 | PopE pipe auto|32773 |8200 |8 | 0 |
Egress Action Codes:
M - Mpls Tunnel, G - GRE Tunnel, MoG - Mpls-over-GRE Tunnel
ECMP Codes:
D - ECMP is divergent across switching chips
-----------------------------------------------------------------------------------------------
| Mpls Table
|-----------------------------------------------------------------------------------------------
| | Label | | | | | ECMP| FEC | Egress
| Label | Action | Destination | VID |Outlif | MAC / CPU Code |Index| Index| Action
|-----------------------------------------------------------------------------------------------
|900002 |Pop | Et2/4 |1027 |8188 | 44:4c:a8:97:8c:51 | - |32771 | -
|900003 |Forward | Et2/4 |1027 |8188 | 44:4c:a8:97:8c:51 | - |32771 | -
|900004 |Forward | Et2/4 |1027 |8188 | 44:4c:a8:97:8c:51 | - |32771 | -
No comments:
Post a Comment