In this post , we will simulate how to configure segment routing (basic configuration)
The running IGP is ISIS level 2
R1#ping 192.168.203.20
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.203.20, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
CSR1#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label 192.168.101.0/24[V] \
0 aggregate/MSSK
CSR2#show mpls forwarding-table
no MPLS apps enabled or MPLS not enabled on any interfaces
CSR3#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label 192.168.203.0/24[V] \
0 aggregate/MSSK
CSR1:
segment-routing mpls
connected-prefix-sid-map
address-family ipv4
1.1.1.1/32 index 100
exit-address-family
router isis 1
segment-routing mpls
CSR2:
segment-routing mpls
connected-prefix-sid-map
address-family ipv4
2.2.2.2/32 index 200
exit-address-family
router isis 1
segment-routing mpls
CSR3:
segment-routing mpls
connected-prefix-sid-map
address-family ipv4
3.3.3.3/32 index 300
exit-address-family
router isis 1
segment-routing mpls
CSR1#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label 192.168.101.0/24[V] \
570 aggregate/MSSK
17 Pop Label 0000.0000.0002-Gi1-192.168.12.2 \
0 Gi1 192.168.12.2
16200 Pop Label 2.2.2.2/32 0 Gi1 192.168.12.2
16300 16300 3.3.3.3/32 0 Gi1 192.168.12.2
CSR2#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 Pop Label 0000.0000.0001-Gi1-192.168.12.1 \
0 Gi1 192.168.12.1
17 Pop Label 0000.0000.0003-Gi2-192.168.23.3 \
0 Gi2 192.168.23.3
16100 Pop Label 1.1.1.1/32 1098 Gi1 192.168.12.1
16300 Pop Label 3.3.3.3/32 1098 Gi2 192.168.23.3
CSR3#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label 192.168.203.0/24[V] \
570 aggregate/MSSK
17 Pop Label 0000.0000.0002-Gi1-192.168.23.2 \
0 Gi1 192.168.23.2
16100 16100 1.1.1.1/32 0 Gi1 192.168.23.2
16200 Pop Label 2.2.2.2/32 0 Gi1 192.168.23.2
CSR1#show ip cef 3.3.3.3/32
3.3.3.3/32
nexthop 192.168.12.2 GigabitEthernet1 label 16300()
CSR3#show ip cef 1.1.1.1/32
1.1.1.1/32
nexthop 192.168.23.2 GigabitEthernet1 label 16100()
CSR1#show isis segment-routing
ISIS protocol is registered with MFI
ISIS MFI Client ID:0x63
Tag 1 - Segment-Routing:
SR State:SR_ENABLED
Number of SRGB:1
SRGB Start:16000, Range:8000, srgb_handle:0x7F25A007F490, srgb_state: created
Address-family IPv4 unicast SR is configured
Operational state:Enabled
Receive is enabled
Advertise local is disabled
Explicit null is disabled
SR label preferred is disabled
CSR3#show isis segment-routing
ISIS protocol is registered with MFI
ISIS MFI Client ID:0x63
Tag 1 - Segment-Routing:
SR State:SR_ENABLED
Number of SRGB:1
SRGB Start:16000, Range:8000, srgb_handle:0x7FBE8DB056F8, srgb_state: created
Address-family IPv4 unicast SR is configured
Operational state:Enabled
Receive is enabled
Advertise local is disabled
Explicit null is disabled
SR label preferred is disabled
CSR1#show segment-routing mpls state
Segment Routing MPLS State : ENABLED
CSR3#show segment-routing mpls state
Segment Routing MPLS State : ENABLED
CSR1#show isis database level-2 verbose
Tag 1:
IS-IS Level-2 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
CSR1.00-00 * 0x00000005 0xECC1 383 0/0/0
Area Address: 49.0001
NLPID: 0xCC
Router CAP: 1.1.1.1, D:0, S:0
Segment Routing: I:1 V:0, SRGB Base: 16000 Range: 8000
Hostname: CSR1
Metric: 10 IS-Extended CSR2.01
Lan Adjacency SID:
SID Value:17, CSR2, F:0 B:0 V:1 L:1 S:0 Weight:0
IP Address: 1.1.1.1
Metric: 10 IP 1.1.1.1/32
Prefix-SID Index: 100, Algorithm:0, R:0 N:1 P:0 E:0 V:0 L:0
Metric: 10 IP 192.168.12.0/24
Metric: 10 IP 192.168.22.0/24
CSR2.00-00 0x00000006 0xFD8D 1181 0/0/0
Area Address: 49.0001
NLPID: 0xCC
Router CAP: 2.2.2.2, D:0, S:0
Segment Routing: I:1 V:0, SRGB Base: 16000 Range: 8000
Hostname: CSR2
Metric: 10 IS-Extended CSR2.01
Lan Adjacency SID:
SID Value:16, CSR1, F:0 B:0 V:1 L:1 S:0 Weight:0
Metric: 10 IS-Extended CSR3.01
Lan Adjacency SID:
SID Value:17, CSR3, F:0 B:0 V:1 L:1 S:0 Weight:0
IP Address: 2.2.2.2
Metric: 10 IP 2.2.2.2/32
Prefix-SID Index: 200, Algorithm:0, R:0 N:1 P:0 E:0 V:0 L:0
Metric: 10 IP 192.168.12.0/24
Metric: 10 IP 192.168.122.0/24
Metric: 10 IP 192.168.23.0/24
CSR2.01-00 0x00000002 0x7C4C 934 0/0/0
Metric: 0 IS-Extended CSR2.00
Metric: 0 IS-Extended CSR1.00
CSR3.00-00 0x00000005 0x0B43 1157 0/0/0
Area Address: 49.0001
NLPID: 0xCC
Router CAP: 3.3.3.3, D:0, S:0
Segment Routing: I:1 V:0, SRGB Base: 16000 Range: 8000
Hostname: CSR3
Metric: 10 IS-Extended CSR3.01
Lan Adjacency SID:
SID Value:17, CSR2, F:0 B:0 V:1 L:1 S:0 Weight:0
IP Address: 3.3.3.3
Metric: 10 IP 3.3.3.3/32
Prefix-SID Index: 300, Algorithm:0, R:0 N:1 P:0 E:0 V:0 L:0
Metric: 10 IP 192.168.23.0/24
Metric: 10 IP 192.168.133.0/24
CSR3.01-00 0x00000002 0x9134 882 0/0/0
Metric: 0 IS-Extended CSR3.00
Metric: 0 IS-Extended CSR2.00
R1#ping 192.168.203.20
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.203.20, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/56/72 ms
