Hello! The problem that I am facing is regarding the fragmentation at ASR 9k. The problem is encountered when doing an DR test in an internal network. The flow of packet is basically as the following:
L3 Switch #1(Nexus 9000)-> ASR #1 -> ASR #2 -> L3 Switch #2(Nexus 9000)
The problem first came up when a packet with size larger than 1500 bytes could not be pinged from an interface in L3 Switch #1 to an interface in L3 Switch #2. After fixing the MTU sizes on all the interfaces, the 1500 byte ping was possible. But the other question was, why are the packets not being fragmented? After doing packet capture tests on L3 Switch #1, we came to know that the packet is being fragmented at Switch#1 but not beyond that. What might be the reason for fragmentation not taking place at ASR and beyond?
We have been stuck on this issue for a long time now and I at the moment have very little idea as to where to proceed and troubleshoot further. Any help will be highly appreciated. Thanking you in advance!
