I have a Cisco 1841 branch router with a WIC T1-DSU card. We have a MPLS through a local ISP with a T1 handoff.
The current config for our serial interface is as follows:
no ip address
encapsulation frame-relay IETF
interface Serial0/0/0.1 point-to-point
ip unnumbered BVI1
frame-relay interface-dlci 16
ip address 172.31.1.5 255.255.255.0
bridge 1 protocol ieee
bridge 1 route ip
I did not configure this router, so I would like to know what the logic behind this is? Do I need the BVI1 virtual interface or could I just put the IP addy on the sub-interface (what is best practice)?
Thanks for posting the router config. I find it very strange. It does configure IRB which does allow you to configure both bridging and routing of IP on the router. But the only interface assigned a bridge group is the serial interface. Based on that I would think that you could remove the IRB part of the config, remove the bridge group, and move the IP address to the serial interface/subinterface.
But the router eigrp has neighbor statements that imply that the router can communicate with 5 neighbor routers which is quite odd considering that the serial subinterface is point to point, which usually means a single neighbor. Can you tell us anything about what the serial is connected to? If this is actually some kind of multi point Frame Relay connection it might have negative impacts to change the serial without understanding the environment a bit better.
The serial interface ties into our MPLS through our ISP. I do not know exactly how the MPLS equipment is setup because this is handled by our ISP? We have 6 locations, 2 of which have T1 hand-offs and the other 4 have MRV devices which provide an ethernet hand-off.
I did inherit this and not having much expereince with MPLS, I just don't know if this is configured correctly.
I am not sure what to tell you about this configuration. If you do move the IP address to the serial subinterface and remove the BVI, the bridge group, and IRB then I would believe that your router would expect to have only a single EIGRP neighbor over the point to point subinterface. I am not sure what it would do if it received EIGRP hello messages from 5 neighbors on that interface. It might work but it might also break.
So my advise is to go cautiously. You might try to find out more about how the MPLS is set up and working at the ISP. And you might ask if they know anything about the configuration of your router using IRB, BVI, bridge group (perhaps they were the ones who suggested this in the first place).
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