BGP Session for two multihomed locations

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.
LVL 2
gi2untIT ManagerAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Jan SpringerCommented:
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.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
gi2untIT ManagerAuthor Commented:
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
0
Jan SpringerCommented:
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.
0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

gi2untIT ManagerAuthor Commented:
do I need to have a bgp session between the two locations as well?
0
Jan SpringerCommented:
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).
0
gi2untIT ManagerAuthor Commented:
just to make sure, I would use the neighbor <peer ip> allowas-in for each peer I  have sessions with?
0
Jan SpringerCommented:
yes, this indicates that you are willing to accept prefixes from outside your network that have your AS in the path for the prefix.
0
gi2untIT ManagerAuthor Commented:
Thanks for your patience with me. :-)
0
gi2untIT ManagerAuthor Commented:
What is the command for Nexus 7000?
0
Jan SpringerCommented:
neighbor <ebgp neighbor ip> allowas-in

should work for both NX-OS and IOS.
0
gi2untIT ManagerAuthor Commented:
i needed to enter the address-family ipv4 unicast config mode in neighbor mode first. I got it

Thanks
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Networking Protocols

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.