OSPFv3 IPv6 interarea summary route

[John_S209]

so I'm digging in OSPFv3 IPv6 routing, and someone at work is "helping", and gave me a problem to work.

show ipv6 route shows these routes:

O IA 2001:0DB8:0:0:7::/64 [110/20] via FE80::1122:CCFF:FE00:1111, Fa0/0

O IA 2001:0DB8:0:0:8::/64 [110/100] via FE80::1122:CCFF:FF:FE00:1111, Fa0/0

O IA 2001:0DB8:0:0:9::/64 [110/40] via FE80::1122:CCFF:FE00:1111, Fa0/0

my task is to answer the metric for the summary route that summarizes the 3 OSPF routes.

the answer is probably right in front of me but I'm not finding it.  can one of you fine folk give me a shove in the right direction?

thx in advance.  John

[luis_cordova · Accepted solution]

Hi @John_S209 ,

Check this:

https://learningnetwork.cisco.com/thread/15168

Regards

[Deepak Kumar · Accepted solution]

Hi,

My answer is 100.  The cost of the summarized routes will be the highest cost of the routes being summarized. 

[John_S209]

thanks everyone!  I must remember to search within the community here for topics such as this.  my wider, web based search did not send me these results.  I think I put reasonable effort into my own search before "adding overhead" to the community here.  many thanks to those who replied.

and in trying to extend this to others, I dug until I found the basis for the answers, because sometimes I'm just that way.

it's posted in a white paper here which refers to RFC 2178 that was obsoleted by RFC 2328 - link - this topic begins below Table 7 near the bottom of p 35.

thanks again all!  -John