How to realize the BGP multi processes and network transfer

Created: Mar 14, 2016 13:42:54Latest reply: Mar 14, 2016 20:32:13 1670 1 0 0
How to realize the BGP multi processes and network transfer
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Ravger  Visitor   Created Mar 14, 2016 20:32:13 Helpful(0) Helpful(0)

As we all know, a router support only one BGP process, with one single AS number configured. But in some special cases such as network migration with changing the AS number, we require some features to switch the network smoothly. The literature reference is BGP Support for Dual AS Configuration for Network AS Migrations, the URL: http://tech/article.php/4728. In the V5, the fake-as command is used to set up a fake AS number for a designated PEER, and this feature is only used for EBGP PEER.
Using this command (same as the local-as command of Cisco), you can specify BGP peer to configure a fake AS number different from the as number designated by BGP.
After the command peer { group-name | peer-ipv4-address } fake-as [ number ] is run , this EBGP peer user the fake-as number but the real as number to establish peers with the local BGP router. For Example, local RTX(local ip 57.0.0.1)BGP configuration is as follows:
BGP 100
router-id 1.1.1.1
undo synchronization
peer 57.0.0.2 as-number 57
peer 57.0.0.2 fake-as 88
Then RTX establish peers with 57.0.0.2 will be 88, not 100. Meanwhile, the remote AS number of RTY (57.0.0.2) will also be 88, not 100.
Related BGP configuration is as follows:
BGP 57
peer 57.0.0.1 as-number 88
undo synchronization
In the real use, this command usually is combined with peer { group-name | peer-ipv4-address } substitute-as.
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