bgp pmtud

Hi all,

By default when bgp router sends update ...does it sets DF bit ?
question 1

in this case if the size of update packet let say is larger than
MTU of any of transit links ..then any transit router upon reception of
DF marked bgp update packet send an ICMP error , if icmp is filtered due
to any firewall then originating router will not reduce the MSS and this
results in oscilaitng bgp sessions

http://nagendrakumar-nagendra.blogspot.com/2010/03/bgp-path-mtu-discovery.html

does any one have experinced the same or can comment on this ?

2) if bgp path mtu is enabled by default ..then do the router undergo
path mtu discovery ..and figures out lowest mtu of transit links and then
adjusts the [mss = lowes mtu - (ip headers) - (tcp headers) ] ..?

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Received on Thu Nov 01 2012 - 16:51:12 ART