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Forum Replies

  1. Hi Rene,

    Now I have a problem that makes me want to pull my hairs out. We're a global company that has 5 different branches in 3 different countries. The current situation is every branch has its own private AS# and we use eBGP to connect all the branches. We have all the devices run OSPF and IBGP inside of each branch. As I said before, we have 5 different branches in 3 different countries, which means actually 3 branches we'll need to use the same ISP. In order to help with the understanding, please refer to the diagram attached. let's see 65521 R3 is running static route to go to ISP A. For 65524, I want the traffic to go through ISP A by adding a static route on R3. This will need us to redistribute the static route to EB GP for R8 to know it, right? As we redistribute the static route to the BGP, all the router in 65523 will know the road to ISP A. However, same traffic sometimes will also initiate on 65523, which I don't want them to go ISP A, I want them to go ISP B. Which means i don't want any redistributed static route to affect anything for R4 and R5, is there any easy way to achieve this?

    It will be highly appreciated if you can help me with it.

  2. mark1 says:

    Hello,

    Is the prefix list defined on the Customer router in the example correct? I had to change it to 10.10.10.0/24 to get it to work in my testing.

    Thanks

    Mark

  3. Hi Mark,

    It depends on your loopback interface. In my case, I had a /32 on the loopback which was advertised in BGP:

    Customer#show running-config | section bgp
    router bgp 10
     no synchronization
     bgp log-neighbor-changes
     network 10.10.10.10 mask 255.255.255.255
  4. Hi Rene,

    very nice introduction to BGP communities. However, I've a little improvement: A hint that communities were only forwarded from second router to a third one if send-community is activated on that neighborhood were be helpful.

    Br,
    Sebastian

  5. Deep says:

    Rene/ Andrew, I have a requirement that I need a community attribute received from another peer [ Not Cisco]. What is the configuration then on my cisco router to RECEIVE only? Is there something line 'receive-community' as of 'send-community'.

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