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hi, here is my scenario setup,host A - - router A -- PE 1 --- PE2 ---GRE tunnel over AT&T EVPN circuit----PE3- router B- host BI am currently setup MPLS over GRE tunnel with Cisco ASR9901, i have configured MTU 1400/ TCP- MSS-adjust-enable on tunn...
tunnel-ip10 is up, line protocol is upInterface state transitions: 1Hardware is TunnelDescription: GRE tunnel to xxxxInternet address is 10.199.163.173/30MTU 1400 bytes, BW 100 Kbit (Max: 100 Kbit)MTU size is setup as 1400, xxx#ping 10.199.163.174 si...
thanks you for spending time to discuss this issue, I think i can adjust MTU little higher, GRE tunnel overhead: 24byte, MPLS overhead: 8byes, MTU can be adjusted to 1468 Byte, I will try it during our next change window. right now, the issue is ...
there is no IPsec, it is MPLS over GRE tunnel. we run ping test on client router in both side, when sending packet less than 1360, it went through, for packet bigger than 1360, it got dropped.
if MTU 1400 is not configured on GRE tunnel interface, GRE overhead 24 bye, MPLS 2 label 8 bytes, big packet size can be go through 1500-24-8=1468. once MTU 1400 is configured on GRE tunnel interface, the big packet will around 1360. the problem is...
thanks for your kindness to reply quickly, it is prod system, i cannot change any time, is there any reason to change MSS/MTU to 1200? we need to transfer regular size packet(1500) through MPLS link, thanks.
