% Create the peer-group first – Cisco BGP issue

Today a customer asked me to add a peer via the Lonap peering LAN to their border routers. Normally a trivial operation as we, like everybody else use a peer-group arrangement, but on this occasion it would not accept the config:

router1(config)#router bgp 8401
router1(config-router)#neighbor remote-as 12345
% Create the peer-group first

After some Googling I found that there is a ‘bug’ in the IOS which means that if somebody tries to configure an invalid ip address (i.e. a typo), then until the device is reloaded, no more peers can be added. Although i found i could add peers with different ip addresses altogether? In the end I used the workaround command:

no parser cache

Which solved the issue.

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