I have three 3560 which each have a separate trunk port connected to two 3750?s.
The three 3560?s are in different vlans.
The 3750?s are both connected via layer 3 links to the 4510.
I am using HSRP on the 3750?s.
3560a and 3560b are sending data via 3750a
3560c is sending data via 3750b.
There is no link between the two 3750?s. All works without any problem. I can pull the active trunk links out and the data goes via the alternate 3750.
Now I introduce OSPF and use area0 for both 3750?s and the 4510. Again all seems to work ok but looking at the routing table on the either of the 3750?s I see lots of possible routes to the other 3750?s routed link back to the 4510 all with the same cost. I am thinking that this is happening because OSPF updates are being sent across each 3560 switch to the other 3750.
My questions is. Even though all seems to work ok is this the correct state to leave these switches or have I made a complete hash of things I did think of using acl?s to prevent OSPF messages traversing the 3560?s
[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...