Switching

We have used the Cisco 7600 as a combination router and switch for many years. We recently began replacing the 7600 with the ASR9000 chassis for L3 routing functions. However, we are not convinced the ASR is the right choice for L2 switching. I am lo...

Hello, I'm studying VLANs and I have a doubt. I'm in the following scenario: I have three PC: PCA, PCB, PCC and each of them belong at differents VLANs and they are connected to a switch on three separated FastEthernet ports. The switch is connected ...

Hi, I'm studying Spanning Tree Protocol If I type the command: S1#sh spanning-tree vlan 1   I have the following output: VLAN0001    Spanning tree enabled protocol ieee    Root ID Priority 32769             Address 0001.42A7.A603             This bri...

Hello, I do understand the Native Vlan concept and how to configure it.  But, I am a little confused about what traffic should be put into the Native Vlan. What are some recommendations and why? Thank you, PA

Are BFD and NSF mutually exclusive in a Cat6800 VSS? BFD detects link failures rapidly and tears down the OSPF adjacency but NSF would need some seconds to let standby supervisor take over.

I'm looking for an explanation into MST and RPVST interoperability. I've been using the below document as a guide as to what I should expect  but I'm not seeing what it seems I should expect.  http://www.cisco.com/c/en/us/support/docs/lan-switching/...

I have issues with an isr 4431 running ios-xe not performing well with dns forwarding.  It seems that when dns on windows clients is directed to the isr as it's primary dns.  The web resolution is intermittent.  Some sites load others don't.  When pr...

Would like to know how 3850  Version 03.02.02.SE computes and allocates poe requirements. As seen below we have stacked 4 3850 and switch 3 only has about 160+ watts. Is there a fix to this problem.  We have connected avaya phones to all switches but...

I'm having a problem. I'm currently on my first year of an IT education and was messing around with packet tracer. I ran into the problem of being unable to ping across a router. I have several subnets, one on each side of the router, so I'd like to ...

I was looking into Cisco 4500-X series switches and didn't see any support for 40Gb Line Card.  Will Cisco introduce 40Gb or 100Gb linecard support in the future.  I didn't see anything on the roadmap. 

I have a 4900M running entservices version of 15.1(2)SG7, I'm attempting to test some of the LACP features but I don't see the lacp options under the interface commands. Am I missing something to activate these commands?