Ethernet Switches & Routers

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Occasional Contributor
Posts: 10
Registered: ‎05-09-2011

BGP best route is not being picked

Hi,

I can't figure out why best route is not being picked. Our BigIron RX4 is multihomed with two different providers. We have the same setup in two different locations.

In one of them everythign is working as expected:

SSH@comm1.11-RX4#sh ip bgp 71.204.99.128

Number of BGP Routes matching display condition : 2

Status codes: s suppressed, d damped, h history, * valid, > best, i internal

Origin codes: i - IGP, e - EGP, ? - incomplete

    Network            Next Hop        Metric LocPrf Weight Path

*>  10.192.0.0/12      38.122.70.9     0      100    0      174 7922 i

*   10.192.0.0/12      216.221.157.69  0      100    0      3257 7922 i

       Last update to IP routing table: 5d23h30m48s, 1 path(s) installed:

       Route is not advertised to any peers

In the second location none of the routes are picked to be the best:

SSH@VianetRX4.ORD0#sh ip bgp 71.204.99.128

Number of BGP Routes matching display condition : 2

Status codes: s suppressed, d damped, h history, * valid, > best, i internal

Origin codes: i - IGP, e - EGP, ? - incomplete

    Network            Next Hop        Metric LocPrf Weight Path

*   10.192.0.0/12      216.221.156.237 0      100    0      3257 7922 i

*   10.192.0.0/12      69.1.72.229     0      100    0      6473 3491 7922 i

       Route is not advertised to any peers

In fact it looks like in the second example none of the routes are installed. Is there a way to figure out why this is happening?

Occasional Contributor
Posts: 10
Registered: ‎05-09-2011

Re: BGP best route is not being picked

I got it partially figured out. I need to increase “ip-cache” and "ip-route" set to 524288, so it would be able to install all 400000 BGP routes. Unfortunatly when I tried doing it, our 10Gb link module didn't come up. 1Gb link moule worked with out issue. After a reverted back to default value of around 200000, 10Gb link module came back up.

We have same setting at one of our locations on the same switch minus 10Gb link module and it works fine.

Any one ever come across an issue like this?

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