Routing

This part covers Single-Area OSPFv2 (Area 0) configuration across the 6-node Nokia SR OS topology, verification of neighbor adjacencies, route table population, and LSDB behavior with point-to-point and broadcast network types. SR OS Version: 25.7.R1 CLI Mode: MD-CLI (Model-Driven CLI) Configuration Enable OSPF instance 0 in Area 0 across all nodes. Configure physical and system interfaces as point-to-point, set system interfaces as passive to advertise loopback reachability without sending unnecessary Hello packets, and secure adjacencies with MD5 authentication. ...

In this guide, we establish a 6-node Nokia SR OS baseline in Containerlab and configure the physical interfaces, /30 point-to-point subnets, and system loopbacks required prior to enabling OSPF. SR OS Version: 25.7.R1 CLI Mode: MD-CLI (Model-Driven CLI) Containerlab Topology File (topology.clab.yml) name: OSPF-Lab topology: defaults: kind: nokia_srsim image: localhost/nokia/srsim:25.7.R1 type: sr-1 license: license/license.txt nodes: r1: mgmt-ipv4: 172.20.20.9 r2: mgmt-ipv4: 172.20.20.2 r3: mgmt-ipv4: 172.20.20.3 r4: mgmt-ipv4: 172.20.20.4 r5: mgmt-ipv4: 172.20.20.5 r6: mgmt-ipv4: 172.20.20.6 links: # --- CE to PE Links --- - endpoints: ["r1:1/1/c1/1", "r2:1/1/c1/1"] - endpoints: ["r5:1/1/c1/1", "r6:1/1/c1/1"] # --- Core Links --- - endpoints: ["r2:1/1/c2/1", "r3:1/1/c1/1"] - endpoints: ["r2:1/1/c3/1", "r4:1/1/c1/1"] - endpoints: ["r3:1/1/c2/1", "r5:1/1/c2/1"] - endpoints: ["r4:1/1/c3/1", "r5:1/1/c3/1"] Addressing Plan System (Loopback) Interfaces Node System IP Address Prefix Length R1 10.100.1.1 /32 R2 10.100.1.2 /32 R3 10.100.1.3 /32 R4 10.100.1.4 /32 R5 10.100.1.5 /32 R6 10.100.1.6 /32 Physical Interfaces Router R1 Interface Name Port ID IPv4 Address Prefix Length Subnet Neighbor toR2 1/1/c1/1 192.168.12.1 30 192.168.12.0/30 R2 (PE1) Router R2 Interface Name Port ID IPv4 Address Prefix Length Subnet Neighbor toR1 1/1/c1/1 192.168.12.2 30 192.168.12.0/30 R1 (CE1) toR3 1/1/c2/1 192.168.23.1 30 192.168.23.0/30 R3 (P1) toR4 1/1/c3/1 192.168.24.1 30 192.168.24.0/30 R4 (P2) Router R3 Interface Name Port ID IPv4 Address Prefix Length Subnet Neighbor toR2 1/1/c1/1 192.168.23.2 30 192.168.23.0/30 R2 (PE1) toR5 1/1/c2/1 192.168.35.1 30 192.168.35.0/30 R5 (PE2) Router R4 Interface Name Port ID IPv4 Address Prefix Length Subnet Neighbor toR2 1/1/c1/1 192.168.24.2 30 192.168.24.0/30 R2 (PE1) toR5 1/1/c3/1 192.168.45.1 30 192.168.45.0/30 R5 (PE2) Router R5 Interface Name Port ID IPv4 Address Prefix Length Subnet Neighbor toR3 1/1/c2/1 192.168.35.2 30 192.168.35.0/30 R3 (P1) toR4 1/1/c3/1 192.168.45.2 30 192.168.45.0/30 R4 (P2) toR6 1/1/c1/1 192.168.56.1 30 192.168.56.0/30 R6 (CE2) Router R6 Interface Name Port ID IPv4 Address Prefix Length Subnet Neighbor toR5 1/1/c1/1 192.168.56.2 30 192.168.56.0/30 R5 (PE2) Configuration Router R1 (CE1) edit-config global /configure system name "R1 (CE1)" /configure card 1 card-type iom-1 /configure card 1 mda 1 mda-type me6-100gb-qsfp28 /configure port 1/1/c1 connector breakout c1-100g /configure port 1/1/c1 admin-state enable /configure port 1/1/c1/1 admin-state enable /configure port 1/1/c1/1 ethernet mode hybrid /configure router interface "system" admin-state enable /configure router interface "system" ipv4 primary address 10.100.1.1 /configure router interface "system" ipv4 primary prefix-length 32 /configure router interface "toR2" admin-state enable /configure router interface "toR2" ipv4 primary address 192.168.12.1 /configure router interface "toR2" ipv4 primary prefix-length 30 /configure router interface "toR2" port 1/1/c1/1:0 commit Router R2 (PE1) edit-config global /configure system name "R2 (PE1)" /configure card 1 card-type iom-1 /configure card 1 mda 1 mda-type me6-100gb-qsfp28 /configure port 1/1/c1 connector breakout c1-100g /configure port 1/1/c2 connector breakout c1-100g /configure port 1/1/c3 connector breakout c1-100g /configure port 1/1/c1 admin-state enable /configure port 1/1/c2 admin-state enable /configure port 1/1/c3 admin-state enable /configure port 1/1/c1/1 admin-state enable /configure port 1/1/c1/1 ethernet mode hybrid /configure port 1/1/c2/1 admin-state enable /configure port 1/1/c2/1 ethernet mode hybrid /configure port 1/1/c3/1 admin-state enable /configure port 1/1/c3/1 ethernet mode hybrid /configure router interface "system" admin-state enable /configure router interface "system" ipv4 primary address 10.100.1.2 /configure router interface "system" ipv4 primary prefix-length 32 /configure router interface "toR1" admin-state enable /configure router interface "toR1" ipv4 primary address 192.168.12.2 /configure router interface "toR1" ipv4 primary prefix-length 30 /configure router interface "toR1" port 1/1/c1/1:0 /configure router interface "toR3" admin-state enable /configure router interface "toR3" ipv4 primary address 192.168.23.1 /configure router interface "toR3" ipv4 primary prefix-length 30 /configure router interface "toR3" port 1/1/c2/1:0 /configure router interface "toR4" admin-state enable /configure router interface "toR4" ipv4 primary address 192.168.24.1 /configure router interface "toR4" ipv4 primary prefix-length 30 /configure router interface "toR4" port 1/1/c3/1:0 commit Router R3 (P1) edit-config global /configure system name "R3 (P1)" /configure card 1 card-type iom-1 /configure card 1 mda 1 mda-type me6-100gb-qsfp28 /configure port 1/1/c1 connector breakout c1-100g /configure port 1/1/c2 connector breakout c1-100g /configure port 1/1/c1 admin-state enable /configure port 1/1/c2 admin-state enable /configure port 1/1/c1/1 admin-state enable /configure port 1/1/c1/1 ethernet mode hybrid /configure port 1/1/c2/1 admin-state enable /configure port 1/1/c2/1 ethernet mode hybrid /configure router interface "system" admin-state enable /configure router interface "system" ipv4 primary address 10.100.1.3 /configure router interface "system" ipv4 primary prefix-length 32 /configure router interface "toR2" admin-state enable /configure router interface "toR2" ipv4 primary address 192.168.23.2 /configure router interface "toR2" ipv4 primary prefix-length 30 /configure router interface "toR2" port 1/1/c1/1:0 /configure router interface "toR5" admin-state enable /configure router interface "toR5" ipv4 primary address 192.168.35.1 /configure router interface "toR5" ipv4 primary prefix-length 30 /configure router interface "toR5" port 1/1/c2/1:0 commit Router R4 (P2) edit-config global /configure system name "R4 (P2)" /configure card 1 card-type iom-1 /configure card 1 mda 1 mda-type me6-100gb-qsfp28 /configure port 1/1/c1 connector breakout c1-100g /configure port 1/1/c3 connector breakout c1-100g /configure port 1/1/c1 admin-state enable /configure port 1/1/c3 admin-state enable /configure port 1/1/c1/1 admin-state enable /configure port 1/1/c1/1 ethernet mode hybrid /configure port 1/1/c3/1 admin-state enable /configure port 1/1/c3/1 ethernet mode hybrid /configure router interface "system" admin-state enable /configure router interface "system" ipv4 primary address 10.100.1.4 /configure router interface "system" ipv4 primary prefix-length 32 /configure router interface "toR2" admin-state enable /configure router interface "toR2" ipv4 primary address 192.168.24.2 /configure router interface "toR2" ipv4 primary prefix-length 30 /configure router interface "toR2" port 1/1/c1/1:0 /configure router interface "toR5" admin-state enable /configure router interface "toR5" ipv4 primary address 192.168.45.1 /configure router interface "toR5" ipv4 primary prefix-length 30 /configure router interface "toR5" port 1/1/c3/1:0 commit Router R5 (PE2) edit-config global /configure system name "R5 (PE2)" /configure card 1 card-type iom-1 /configure card 1 mda 1 mda-type me6-100gb-qsfp28 /configure port 1/1/c1 connector breakout c1-100g /configure port 1/1/c2 connector breakout c1-100g /configure port 1/1/c3 connector breakout c1-100g /configure port 1/1/c1 admin-state enable /configure port 1/1/c2 admin-state enable /configure port 1/1/c3 admin-state enable /configure port 1/1/c1/1 admin-state enable /configure port 1/1/c1/1 ethernet mode hybrid /configure port 1/1/c2/1 admin-state enable /configure port 1/1/c2/1 ethernet mode hybrid /configure port 1/1/c3/1 admin-state enable /configure port 1/1/c3/1 ethernet mode hybrid /configure router interface "system" admin-state enable /configure router interface "system" ipv4 primary address 10.100.1.5 /configure router interface "system" ipv4 primary prefix-length 32 /configure router interface "toR3" admin-state enable /configure router interface "toR3" ipv4 primary address 192.168.35.2 /configure router interface "toR3" ipv4 primary prefix-length 30 /configure router interface "toR3" port 1/1/c2/1:0 /configure router interface "toR4" admin-state enable /configure router interface "toR4" ipv4 primary address 192.168.45.2 /configure router interface "toR4" ipv4 primary prefix-length 30 /configure router interface "toR4" port 1/1/c3/1:0 /configure router interface "toR6" admin-state enable /configure router interface "toR6" ipv4 primary address 192.168.56.1 /configure router interface "toR6" ipv4 primary prefix-length 30 /configure router interface "toR6" port 1/1/c1/1:0 commit Router R6 (CE2) edit-config global /configure system name "R6 (CE2)" /configure card 1 card-type iom-1 /configure card 1 mda 1 mda-type me6-100gb-qsfp28 /configure port 1/1/c1 connector breakout c1-100g /configure port 1/1/c1 admin-state enable /configure port 1/1/c1/1 admin-state enable /configure port 1/1/c1/1 ethernet mode hybrid /configure router interface "system" admin-state enable /configure router interface "system" ipv4 primary address 10.100.1.6 /configure router interface "system" ipv4 primary prefix-length 32 /configure router interface "toR5" admin-state enable /configure router interface "toR5" ipv4 primary address 192.168.56.2 /configure router interface "toR5" ipv4 primary prefix-length 30 /configure router interface "toR5" port 1/1/c1/1:0 commit Verification Step 1: Verify Port Operational Status Verify physical ports are administratively and operationally Up/Up across all routers: ...