Hi There,
Anyone know where the mtu 17916 comes from when setting up an mpls auto-tunnel template?
Im running mpls auto-tunnels and when i setup the auto-template, it seems to give me a default mpls mtu of 17916. Any idea where this mtu value comes from? is it a cisco default? This only popped in after the ios upgrade to 12.2(33)SRE1 on a 7609S router.
## CONFIG SAMPLE ##
interface Auto-Template1
ip unnumbered Loopback0
mpls ip
mpls label protocol ldp
mpls mtu 17916
tunnel mode mpls traffic-eng
tunnel destination access-list 1
tunnel mpls traffic-eng autoroute announce
tunnel mpls traffic-eng path-option 1 dynamic
tunnel mpls traffic-eng fast-reroute
end
Is this the default behaviour? should i be reducing this? seems a tag high.
Best Regards,
Chanuka