We have 3 offices connected to each other via a Metro Ethernet network. One office has 2 lines into the Metro (call it HQ), and the other two one line each. The links are configured as P2P from HQ to the other offices. Intermittantly the sites are loosing connectivity, and the fix (or rather workaround) is to shut and unshut the interfaces at HQ, but couple of days later it happes again.
What I saw was that the HQ switch seemed to have have mac addresses flapping between its interfaces. This makes sense because the Metro is effectively a big switch and because it is layer 3 interfaces spanning tree will not block one.
To support this as well, is that I put a layer 3 switch in the path of one of the two HQ links and we have been running ever since. However, we are adding more and more sites with 2 lines and each is now requiring a 2nd layer 3 switch which is becoming quite expensive.
My question is, is there a better way of doing this? I am out of ideas on this one.
All the switch ports connecting to the cloud is layer 3 ports, and the models are Cat 4506 12.2(53)SG1. The config is pretty straight forward, the HQ switch has two links, both configured with /30 subnets, each pointing to a branch. At the branches it is also layer 3 ports, with matching /30 subnets. Static routing is used:
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
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Introduction Featured Speakers Luis Espejel is the Telecommunications
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