04-02-2020 03:43 PM
Topology:
CORE1 --L3-- CORE2
| x |
| / L3 \|
WAN1 WAN2
| |
MPLS-BGP DMVPN-EIGRP
WAN1 OSPFv3: redistribute bgp 65000 metric 150 tag 1000 route-map BGP-2-OSPF
WAN2 OSPFv3: redistribute eigrp 300 metric 50 tag 3000 route-map EIGRP-2-OSPF
Question: Why the WAN1 routes are always chosen by CORE1, CORE2 and even WAN2, If WAN2 is redistributing with better metric. If I shut the MPLS IF, the COREs have the Type-5 LSA from WAN2 with the proper info, but as soon as the MPLS comes back up, WAN1 always wins. I do not see any parameter on the LSA that could point to a better choise for WAN1:
OSPFv3 300 address-family ipv4 (router-id 0.0.111.1) <------ RID CORE1
Type-5 AS External Link States
LS age: 16
LS Type: AS External Link
Link State ID: 40
Advertising Router: 0.0.111.11 <-------- RID WAN 1
LS Seq Number: 80000001
Checksum: 0xB450
Length: 36
Prefix Address: 192.168.200.0
Prefix Length: 24, Options: None
Metric Type: 2 (Larger than any link state path)
Metric: 150
External Route Tag: 1000
When I shut the MPLS IF:
LS age: 48
LS Type: AS External Link
Link State ID: 40
Advertising Router: 0.0.111.22 <------------- RID WAN2
LS Seq Number: 80000001
Checksum: 0xAE41
Length: 36
Prefix Address: 192.168.200.0
Prefix Length: 24, Options: None
Metric Type: 2 (Larger than any link state path)
Metric: 50
External Route Tag: 3000
Solved! Go to Solution.
04-02-2020 04:30 PM
Never mind.
OSPFv3 AD 110 wins over EIGRP external AD 170, making WAN2 to prefer the WAN1 routes and not advertising the routes to the core anymore.
04-02-2020 04:30 PM
Never mind.
OSPFv3 AD 110 wins over EIGRP external AD 170, making WAN2 to prefer the WAN1 routes and not advertising the routes to the core anymore.
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