I am having some issues finding this info. Is there a limit to the line rates supported in a SPAN session on Cisco 9K switches? We are building a 40 gig backbone in our new datacenter and are researching visibility options. We will be using 9336 and 9396.  ... View more

I am seeing strange behavior from a 3850 stack running EIGRP to a couple of 4507's. Let me start out by saying that over the past couple of weeks, we have replaced 5 stacks using the same configuration template, code version, etc. with no issues. Before we execute the change to install these switches, we always run failover testing to prove routing. Last night, on the 6th switch stack, failover testing did not succeed. Maybe you can help me figure out why. Here is what happened. I have a loopback configured on the stack. We connect the stack to each of the 4507's at the distribution layer and bring up an eigrp adjacency. I start a continuous ping from another site to the loopback. Then we pull the first link and the ping continues successfully. Plug it back in, bring up the adjacency. Then we pull the second uplink and the ping begins failing (TTL Lost in transit). The route at the source of the ping was lost so it was using the default route which led to nowhere. When I check the route against the table on the 4507's the subnet is not in the table but the adjacency is up.    I have attached a topology drawing of the relevant devices (as I see it). Again, we never experienced this issue with the 5 previous stacks which are all connected to the 4507's the same way.                 ... View more

Ok folks, this has probably been discussed a million times on here but I'm lost and could use your help. I  have an HSRP configuration between a stack of 3750's and two separate 2811 WAN routers for redundancy. I have 3 vlans configured on subinterfaces on both routers going to the stack. The HSRP configuration seems to work beautifully but when I plug into the switch I can only ping on my data vlan to the data vlan gateway IP. I cannot ping to the voice vlan ip or my mgmt ip. I have attached the full 3 configs (stack and 2 routers) as well as a topology photo for your reference. So far I have only really worked on the x.2 router and the stack so you may want to focus on the attached documents labeled Alden-WAN-GW1 and Alden-SW1. To be clear, what I've done is configure a static on a PC in my data vlan and then pinged the data vlan gateway IP. With that same IP I cannot ping the voice gateway. If I change the PC's IP to an address in the voice vlan, I can't ping anything. I cannot ping the mgmt gateway either but I did that on purpose. I'm thinking this has something to do with native vlans on the trunks but I tried configuring the natives on both ends and could not get this working. Please pick me apart and teach me something!                 ... View more