Reachabilty Diagnosis and Troubleshoot:
- Check IPv4/IPv6 address of port and Port up/down status.
- ping each others physical interface
- Ping successful, check ping loopbacks(or advertised/ received prefixes)
- Ping unsucessful = neighborship down
- check RIP version on both ends
- check network prefixes in case of IPv4 and IPv6 rip config per interface in case of IPv6.
- Ping successful, neighborship down on both ends. Routes are available via other protocol.
- In above case, do sh ip cef on both ends.
- When redistributing in bgp, do specify metric. It denotes the max hop the route reachable in the client network.
- When using as PE-CE MP-BGP, nexthops must be reachable, for the remote routes to be reflected in CE FIB.
Expected Outputs:
RP/0/0/CPU0:PE1#sh route vrf M ipv4 | b Gateway
Sun Dec 16 19:23:27.539
UTC
Gateway of last resort is not set
C 2.0.0.0/24 is directly connected, 01:53:19,
Loopback1
L 2.0.0.1/32 is directly connected, 01:53:19,
Loopback1
R 2.0.0.18/32 [120/1] via 2.1.18.18, 01:38:56,
GigabitEthernet0/0/0/3
C 2.1.18.0/24 is directly connected,
02:47:24, GigabitEthernet0/0/0/3
L 2.1.18.1/32 is directly
connected, 02:47:24, GigabitEthernet0/0/0/3
RP/0/0/CPU0:PE1#
RP/0/0/CPU0:PE1#sh rip vrf M database
Sun Dec 16 19:25:35.470 UTC
Routes held in RIP's topology
database:
2.0.0.18/32
[1] via 2.1.18.18, next hop
2.1.18.18, Uptime: 8s,
GigabitEthernet0/0/0/3
2.0.0.0/24
[0] directly connected,
Loopback1
2.1.18.0/24
[0] directly
connected, GigabitEthernet0/0/0/3
2.0.0.0/8
auto-summary
RP/0/0/CPU0:PE1#sh rip vrf M statistics
Sun Dec 16 19:27:13.224 UTC
RIP statistics:
Total messages
sent: 264
Message send failures: 0
Regular
updates sent: 256
Queries responsed
to: 3
RIB
updates:
5
Total packets received:
330
==========================================================================
Auto Summarization fix (Ripv2)
router rip
version
2
network 10.0.10.0
!
===> after sh run it will appear as 10.0.0.0
due to default auto summarization. Also show ip route on neighbor will show 10.0.0.0/8
network.
Solve this for all rip neighbors (router rip config)
do ==>
router rip
no auto-summary
!
Solve for
particular prefix available via particular interface ==>
int
e0/0
ip summary-address rip 10.0.0.0 255.255.0.0
!