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Results tagged with vlan
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user 209
For questions about Virtual LANs (VLANs) which are used to divide what otherwise would be a single OSI layer-2 broadcast domain into multiple, logical OSI layer-2 broadcast domains.
12
votes
2
answers
8k
views
Tracing TCN Messages in STP
We have about 20 vlans on a L2 network running Rapid PVST+ where the root bridge is a stack of Cisco's 3750 switches. I am a bit puzzled by the number of TCN notifications I receive on the switch..
…
- 894
13
votes
3
answers
38k
views
Mac-flap due to roaming clients on wireless
I occasionally get mac-flaps within the VLAN tied to a SSID. I know this is coming from a roaming client.. … is that the company I work for has end to end vlans (no money to put L3 devices on access-layer) and I believe that these mac-flaps cause the mac-table to get flushed throughout the L2 domain for that VLAN …
- 894
13
votes
Accepted
Locate a host on Network
Take a look at Layer2 traceroute (for cisco).. Cdp should be running btw...
Router# traceroute mac 0000.0201.0601 0000.0201.0201
Source 0000.0201.0601 found on con6[WS-C2950G-24-EI] (2.2.6.6)
con6 (2 …
- 894