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Multiple BGP instance in one router

Hi ,

 

Is that possible to run multiple BGP instance in one router ? if not, why.? Please.

Ex:

Router BGP 500

Router BGP 600

3 ACCEPTED SOLUTIONS

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VIP Engager

Yes, BGP does multiple BGP instances like IPv4 and IPv6, VRFs and VPNs can run on the same router under same BGP AS number;  those are called address families (address-family).

However, you can only run 1 BGP AS number on a router. you cannot enable BGP with different AS number if yo already running BGP.

 

Regards, ML
**Please Rate All Helpful Responses **

 

 

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Not like the way you have shown.

However, each router instance can run bgp with a different ASN. 

You can also use local-as for changing your AS with a neighbor e.g. for migrating purposes.

HTH.

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6 REPLIES 6
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VIP Engager

Yes, BGP does multiple BGP instances like IPv4 and IPv6, VRFs and VPNs can run on the same router under same BGP AS number;  those are called address families (address-family).

However, you can only run 1 BGP AS number on a router. you cannot enable BGP with different AS number if yo already running BGP.

 

Regards, ML
**Please Rate All Helpful Responses **

 

 

View solution in original post

Highlighted

Not like the way you have shown.

However, each router instance can run bgp with a different ASN. 

You can also use local-as for changing your AS with a neighbor e.g. for migrating purposes.

HTH.

View solution in original post

Highlighted
VIP Expert

On a side note, I searched for any software that actually does support multiple BGP instances on the same router. QUAGGA does, just in case anybody is interested...

 

https://www.nongnu.org/quagga/docs/docs-multi/BGP-instance-and-view.html

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Rising star

why we need BGP instance in router ?
the BGP design is multi instance (as I think ) by default.
for example 
I have one router with AS 100 it can connect to 
AS 100 ibgp 
AS 200 ebgp 
AS 300 ebgp 
AS 100 ibgp 

do show ip BGP you will see all prefix from different AS even if you us only AS in your Router.  

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You are so so welcome