Hi,
in my scenario the branches are connected with multiple isps
lets say X is advertising its route to both ISP's from 3 exit points ,
1. when this route is reaching at Router C through ISP-B , i am blocking it to advertising it to ISP-A form this router
2. when this route is going to Router E from Router X it is redistributing in BGP cloud through ISP-A means this Route is Receiving By Router C Via ISP-A , Router D via ISP-A and Router A via Router C which is learnt from ISP-A
i). at Router A i block to redistributre into ISP-B
ii). at Router D while redistributing into IGP i set the metric high , because when it sends this route to X it should not use this route.
3. when this route is reaching Router D from Router X it is redistributing in BGP Cloud through ISP-A , means this route is aging reaching to Router C via ISP-A , Router E via ISP-A and Router A via Router C which is learnt from ISP-A.
i). at Router A i block to redistributre into ISP-B
ii). at Router E as this coming as BGP and as to keep BGP route in the routing table i decrease the weight to '0' & local-preference to '90' for this route, than i am receiving this route in the routing table of Router E as BGP
till here everything is oK.
Problem: when Link (Primary ) B/W Router D and ISP-A goes Down
1. Route X is advertising 192.168.110.0 through Router E redistributing IGP (OSPF) into BGP , but branches are getting this route in the routing table packet is getting dropeed ( unless i change local preference for this path to 100 in Router E configuraiotn where i have set '90' previously ) in the BGP Cloud only.
2. i noticed that Router C is not keeping BGP route in the routing table ( unless i change local preference for this path to 100 in Router E configuraiotn where i have set '90' previously ) even i set local-preference fo this route to '50' in the Router C configuration it is not keeping BGP route in the routing table.
it is using which it is learning from Router A via ISP-B
so i want this route as BGP in the routing table of Router C , when the link B/W Router D and ISP-A link goes DOWN ( without changing local-preference in Router E which i set 90 i want use as 90 only )
Note: if i increase local preference in Router E to 100 every thing is working fine no issues ( but you know if i increase this to 100 when link B/W Router D and ISP-A come up, in the Router E for 192.168.110.0 route it will use as IGP (OSPF) not the BGP )
can any one suggest me , how to do this or am i missing any thing . kindly find attached diagram for your reference.
