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BGP Session for two multihomed locations

Posted on 2014-07-16
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Last Modified: 2014-08-14
I have location 1 with two separate ISPs running BGP with full routes and advertising a single /24.
Location 2 needs to run the same dual ISP BGP sessions but i want to use the same ASN. The current BGP session is running on a Cisco Nexus 7010 and the new location will be using a Cisco ASR 1002.
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Question by:gi2unt
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Jan Springer earned 2000 total points
ID: 40200098
That's not a big deal.

You'll just have to allow your own ASN in:

neighbor <peer ip> allowas-in

if you want to be able to reach the one location from the other.
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by:gi2unt
ID: 40200126
ok, Here is location one:

router bgp 11111  //my asn is a real one, the 11111 is in place of mine
  neighbor 1.1.1.1 remote-as 1  //isp A
  neighbor 2.2.2.2 remote-as 2 //isp B
 network 1.2.3.0/24


Location 2:

router bgp 11111
  neighbor 3.3.3.3 remote-as 3 //isp C
  neighbor 4.4.4.4 remote-as 4 //isp D
network 4.5.6.0/24

is there any problem using the same AS for 2 different locations with each location have 2 isps
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by:Jan Springer
ID: 40200131
no and you should configure it for both peers if you want networks 1.2.3.0/24 and 4.5.6.0/24 reaching each other without any problems.
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by:gi2unt
ID: 40200149
do I need to have a bgp session between the two locations as well?
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Expert Comment

by:Jan Springer
ID: 40200160
not necessarily since they aren't directly connected (yes you could do a gre tunnel and iBGP but I really don't see the necessity).
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Author Comment

by:gi2unt
ID: 40200268
just to make sure, I would use the neighbor <peer ip> allowas-in for each peer I  have sessions with?
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Expert Comment

by:Jan Springer
ID: 40200279
yes, this indicates that you are willing to accept prefixes from outside your network that have your AS in the path for the prefix.
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Author Closing Comment

by:gi2unt
ID: 40200286
Thanks for your patience with me. :-)
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Author Comment

by:gi2unt
ID: 40261225
What is the command for Nexus 7000?
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Expert Comment

by:Jan Springer
ID: 40261243
neighbor <ebgp neighbor ip> allowas-in

should work for both NX-OS and IOS.
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Author Comment

by:gi2unt
ID: 40261249
i needed to enter the address-family ipv4 unicast config mode in neighbor mode first. I got it

Thanks
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