ip tcp path-mtu-discovery vs neighbor A.B.C.D transport path-mtu-discovery
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07-31-2012 08:58 AM - edited 03-04-2019 05:07 PM
Hi,
Does enabling or disabling "ip tcp path-mtu-discovery" globally affect the bgp neighbor "path-mtu-discovery" by any way ?
The doc cd says as below
To enable the Path MTU Discovery feature for all new TCP connections from the router, use the ip tcp path-mtu-discovery global configuration command
http://www.cisco.com/en/US/docs/ios/12_2/ipaddr/command/reference/1rfip2.html#wp1101164
To enable a TCP transport session option for a Border Gateway Protocol (BGP) session, use the neighbor transport command in router or address family configuration mode.
path-mtu-discovery Enables TCP transport path maximum transmission unit (MTU) discovery. TCP path MTU discovery is enabled by default.
http://http://www.cisco.com/en/US/docs/ios/iproute_bgp/command/reference/irg_bgp4.html#wp1144431
Regards,
Nilesh
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08-01-2012 07:24 AM
Hi nilesh,
they are unrelated because the different layer they need to work with (MTU layer 2 vs TCP layer 4) however, you need to pay attention to let these to values to work together to avoid excessive fragmentation or retransmissions due to a too big segment vs some limits to the MTU.
Although they should not have impact on BGP, i would enable neighbor transport only with an outage of at least 30 minutes planned. Never challenging BGP
HTH
Alessio