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Posted by joeblow on February 16, 2005, 5:13 pm
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I've got six 3550-24 switches with three vlans vlan_a vlan_b and vlan_c
set up across all six 3550s. They are interconnected with gigabit fiber.
I want to monitor vlan_a with a fluke lanmeter. I'm plugging the lanmeter
into fastethernet 0/24 on the switch in the lab (which is not the cluster
master).
Can I get away with:
SW_LAB # mon sess 1 source vlan 2 rx
(2 is the vlan_a vlan number)
Or do I need to set up rspan on the other 5 3550's as well to see all
vlan_a traffic?
Thanks!
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Posted by Walter Roberson on February 17, 2005, 3:05 am
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:I've got six 3550-24 switches with three vlans vlan_a vlan_b and vlan_c
:set up across all six 3550s. They are interconnected with gigabit fiber.
:I want to monitor vlan_a with a fluke lanmeter. I'm plugging the lanmeter
:into fastethernet 0/24 on the switch in the lab (which is not the cluster
:master).
:Can I get away with:
:SW_LAB # mon sess 1 source vlan 2 rx
:Or do I need to set up rspan on the other 5 3550's as well to see all
:vlan_a traffic?
You mention that the 3550's are connected via gigabit fibre, but you
din't mention the magic word "gigastack". I was looking at the
documentation just yesterday; as best I can tell, 3550's that are
connected via plain GBICs act as independant devices; putting them into
a "cluster" just makes administration easier. When you use "gigastack"
GBICs, though (easy to tell, there is two connections for each
gigastack GBIC instead of a single connection) then the 3550's are
truly stacked together.
If stacked, you could expect to be able to span all of the vlan 2
traffic, but if merely cross-connected then you would only see the vlan
2 traffic that needed to go as far as the spanning switch in order to be
handled.
--
Sub-millibarn resolution bio-hyperdimensional plasmatic space
polyimaging is just around the corner. -- Corry Lee Smith
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Posted by Jayesh Sharma on February 16, 2005, 11:36 pm
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First of all understand.. wht stacking is..and how it is different from
cascading.. When u stack 3550's it just extends the switching fabric
across multiple switches.. so it still acts as a single switch.. When u
cascade two switches.. then u hv to enable trunking between two
switches.. considering u hv multiple VLANS...
U need RSPAN when u hv trunking enabled between two switches.. ( or if
they are cascaded) but this is not the case in stacking .. hence RSPAN
is not needed..
The configuration mentioned should work.. Also i hope u must hv
specified the second command to specify destation as the port on which
sniffer is connected...
~ Jay :o)
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Posted by thrill5 on February 21, 2005, 12:23 pm
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From: anybody43@hotmail.com
Newsgroups: comp.dcom.sys.cisco
Subject: Re: 'Wargames' Ping Utility
Date: 21 Feb 2005 09:33:34 -0800
Organization: http://groups.google.com
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