The 3750 (and it would appear, the 3560s, 4500s, and 6500s) have an integrated Time Domain Reflector which is used to test cables associated with a port.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_see/command/reference/cli3.html#wp2168243
Today I was troubleshooting a problem at a newly renovated remote office with an IP phone that would power up but not boot. After swapping cables and phones, [...]
CCNP Recertification
Study notes for the Cisco CCNP exam
Using a 3750 to test cables
Posted in December 21st, 2007
by sean in
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Passed BCMSN
Posted in August 17th, 2006
I just got back from passing 642-811. Even though I ended up with a 962 the number of questions that I thought “I think that’s the right answer” would have made me think my score would have been lower (though as I go back and check, it looks like I was right on most)
Compared [...]
Multicast - PIM implementation and testing with MRM
Posted in July 11th, 2006
Implementation of multicast, at least for the purposes of the CCNP BCMSN exam, is pretty simple. Cisco has the Multicast Quick-Start Configuration Guide which goes over many different ways of doing it.
The exam seems to only care about Protocol Independent Multicast (PIM), which uses the router’s routing table to determine whether or not a [...]
Multicast
Posted in July 10th, 2006
I labbed up some Multicast stuff a while ago and only now am sitting down to write it. I’d like to write BCMSN by the end of the month because I’m taking two weeks off at the beginning of August where I won’t be near the Internet (or my routers) too often.
What is multicast?
Multicast [...]
Hardware priority queues on Catalyst switches
Posted in June 8th, 2006
Just a note while I come up for air…
On most switches with a hardware priority queue (egress expedite queue) like the 3550, it’s statically assigned to queue 4 (on switches with 4 queues). Some switches like the 4500s let you switch the queue, but generally it’s on silicon so you’re stuck. No problem.
However, [...]
Spanning Tree Protocol
Posted in July 27th, 2004
The Spanning Tree Protocol (STP) exists to build a loop free path on layer two.
The exam outline has the following items related to STP:
Explain the operation and purpose of the Spanning-Tree Protocol (STP) on a switched network
Enable Spanning Tree on ports and VLANs
Configure Spanning Tree parameters including: port priority, VLAN priority, root bridge, BPDU guard, [...]
Network Management Features
Posted in March 29th, 2004
In a pretty naked marketing attempt, the following objective appears on the outline:
Describe the features and operation of network analysis modules on Catalyst switches to improve network traffic management
Most of what I found on this is from the Network Analysis Module (NAM-1/NAM-2) page. The NAM 1/2 data sheets provide more information on what this [...]
802.1Q Tunneling
Posted in March 17th, 2004
While I haven’t covered 802.1Q yet, I wanted to look at “QinQ“, allowing service providers to tunnel 802.1Q over their own managed ethernet network, which is likely running 802.1Q for customer separation.
Describe the features and operation of 802.1Q Tunneling (802.1QinQ) within a service provider network
Describe the operation and purpose of managed VLAN services
Packet Magazine ran [...]
