[c-nsp] BGP (VPNv4) flapping every 3minutes

[Mark Tinka]

On Sunday, December 21, 2014 01:28:30 AM CiscoNSP List 
wrote:

> ok - Ive after a bit of searching, looks like it is
> caused by mtu...Ive added " transport path-mtu-discovery
> disable" to one of the RR's on .219, and it's been up
> for 7+min....looks like this was the issue..

To avoid this, I like to set "ip tcp-mss" (tcp-mss on Junos) 
to a fixed value lower than my core MTU, but high enough to 
ensure quick BGP updates are pushed out between routers.

This way, you don't end up with custom configurations like 
what you have above on some routers, and not on others, 
ensuring your configuration is pretty standard on all 
devices.

Mark.
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