Hello,
Was really appreciate if someone can provide some assistances. We have a number of sites setup like the attached picture, all connect to AS65002 who is our MPLS provider.
Each site has an internet connections and a connection to our MPLS provider, over the internet we have a tunnel where we peer with eBGP to the other sites, we also peer with our MPLS provider via eBGP. Within each site we have iBGP relationship between the routers who peer with eBGP and all devices have IGP (OSPF) between them.
We have noticed strange behaviour (routes-flapping and routing loops between iBGP neighbours) across the network. We have networks behind Routers C on both sites which are passed into OSPF and networks from Site A which are reached via Static.
The network was setup where in Site A, the static route from Router A was redistributed into BGP and OSPF and Router B had redistribution from OSPF to BGP and vice versa . For Site B, both Router A and B had redistribution from OSPF to BGP and vice versa.
Routes which are redistributed from BGP into OSPF have a metric set of 1000 and type E1 on Router A at both sites, compared to Router B where they are set to a metric to 1 and type E1.
We want to make sure the path via AS65002 is always preferred as it’s a much faster connections, if the 100Mbps link fails the network would transverse over the internet, using the eBGP tunnel.
I have read previously that you should not redistribute your BGP table into IGP. If I follow the advise and when the 100Mbps link fails, as I’ve not redistributed BGP into OSPF on Router A on both sites, Router C does not know about the networks which lives on the other site and therefore drops the connections – is this correct?
Which routers should be redistributing to what routing protocol?
I guess we also need to filter routes from the iBGP and eBGP neighbours to avoid loops? One of the think we have seen is a route shows up from BGP and then OSPF and then vice versa, causing a bouncing loop.
Thanks in advance.
