EIGRP IWAN / STUB SITE

[morph.andy]

Hi 

firstly apologies for this question

I cannot get my head round the WAN stub site command.  I get the stub router function, and benefits etc.  But every time I read about wan stub site, it throws me and I dont get it.  If its some sort of stub command that stops the wan interface from receiving eigrp routes. wouldn't you use a passive interface in that case ?

reading the cisco documentation : .

This eigrp stub-site command resets the peers on WAN interfaces and
initiates relearning of routes from WAN neighbors

This confuses me - help

Can someone explain it to me, as if I was a 2 year old dog

[MHM Cisco World]

I will run lab CSR1000 which support IOS XE, I think IOS not support this feature. 
but since you select solve I will postponed the lab later. 

[MHM Cisco World]

Note:- I almost lab all case I face for two point, first strong my ack and for cover all point about issue.

as I guess IOS not support stub-site 
 IOS XE support stub-site 

I am now little busy, check @David Ruess lab if you want more info. then please ask and I will reply within 3 days 
Sorry 
MHM 

[David Ruess]

OK after getting back to my lab here is what I was able to do @MHM Cisco World :

1. Enabled stub-site on the BR1 router under eigrp config: eigrp stub-site ASN:nn

2. Then under the af-interface pointing towards WAN I configured it as a stub-site wan-interface

Neighbor shows as stub neighbor on WAN router:

On BR1:

*ignore the network and other config. Its my home lab I'm testing with

On BR2:

As you can see it basically advertises itself as a STUB router to only the neighbor whose interface its configured on. So as mentioned before if BR2 loses WAN connectivity it can query BR1 (its neighbor) for the WAN networks. If BR1 was just a regular STUB router it wouldn't be able to advertise the WAN networks to BR2 since STUB routers can only advertise the following:

• Receive-only: The stub router will not advertise any network.
• Connected: allows the stub router to advertise directly connected networks.
• Static: allows the stub router to advertise static routes (you have to redistribute them).
• Summary: allows the stub router to advertise summary routes.
• Redistribute:allows the stub router to advertise redistributed routes.

-David

[MHM Cisco World]

Thanks a lot'

I will run same lab and test it more when I have time

Thanks again 

MHM