Troubleshooting IPv6 Redistribution

Lessons Discussion
1

This topic is to discuss the following lesson:

https://networklessons.com/ipv6/troubleshooting-ipv6-redistribution/

2

Hello,

So we can use the “include connected” as opposed to the following command and it will have the same affect then right?

ipv6 router ospf 6
 log-adjacency-changes
 redistribute rip RIPNG metric 1
ipv6 router rip RIPNG
 redistribute connected metric 1<--------
 redistribute ospf 6 metric 1

Thanks

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3

Hi Fabian,

That’s right. The “redistribute connected” will redistribute any directly connected interfaces into the routing protocol. It will also redistribute directly connected interfaces that are not advertised in any IPv6 routing protocol.

Rene

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4

Hi Rene,

Thanks for reply, I found something interesting though. When setting up redistribution i didn’t have to add a metric command under ospf 6 and it worked fine, does this mean OSPFv3 adds a metric already? Because with no metric command under RIPNG, no routes will get redistributed.

ipv6 router ospf 6
 log-adjacency-changes
 redistribute rip RIPNG include-connected <------
!
ipv6 router rip RIPNG
 redistribute ospf 6 metric 1 include-connected

Thanks

5

Hi Fabian,
What you have discovered is a difference in how those routing protocols deal with redistribution in general, as opposed to IPv6 specifically. It is interesting that Link-State protocols don’t require specifying a metric when redistributing into them. For example, OSPF assigns a default metric of “20” in this case, while IS-IS assigns a metric of zero.

Distance Vector protocols, however, like RIP and EIGRP require you to set some kind of seed metric, or they won’t be advertised.

6

Hi, I’d like to see (maybe I’m not finding it), an IPv6 redistribution example between BGP and IGPs.

7

I don’t have any lessons covering IPv6 BGP redistribution but it is pretty straight forward. Here’s a quick example to redistribute OSPFv3 routes into BGP:

R1(config)#router bgp 1
R1(config-router)#address-family ipv6   
R1(config-router-af)#redistribute ospf 1
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