Running OSPF between two 4507s Gig ports and the neighbors are not coming due to the DB packets being larger than the MTU on both ends. (Not an MTU mismatch as both sides are the same and the "mtu-ignore" did not help.)
Problem is that the two 4500 interfaces are connected via L2TP which lowers the MTU and the OSPF DB tried using 1492 bytes which is too large.
Any way to change OSPF to not use the full 1500 bytes? I would not want to lower the MTU on LAN/Gig interfaces and tweak MSS etc....
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...