Kell is right about things being a mess later on.
The default vlan is VLAN 1, which carries the protocol control traffic for a
switched network. Things like STP BPDU's, DTP (ISL and dot1q), VTP, PAgP,
etc... In addition, if the management interfaces are set to VLAN 1 (the
default), then administrative traffic like SNMP and telnet will use it too.
Keep in mind that VLAN 1 goes to ALL switches regardless of trunking and
VLAN paring settings. You coiuld set up trunking so that every vlan EXCEPT
VLAN 1 gets trunked and you'll still get VLAN 1 trunked. Nature of the
beast. You can pare it out in the config, but the switch will still do it
behind your back. Because of this,its a good idea not to have users on VLAN
1 in any network.
As an example, if there's a broadcast storm it can take down the network by
preventing the protocol traffic from reaching its destination before the
timeouts or you could be locked out of the network unless you use a console
port. Overall, its a little better than a hub network due to the differences
in collision domain structure, but you still have the issue with the
broadcast domain. I found that it tends to be a royal pain in the neck when
theres a problem. Even if all you do is set it up so that everyone is on the
same vlan, as long as its something besides VLAN 1 your network will be a
little more manageable.
HTH,
Karen
*********** REPLY SEPARATOR ***********
On 9/4/2001 at 12:33 PM Patrick Donlon wrote:
>I'm familiar with the concept off using vlan trunks to send vlan information
>to a connected switch, however I've been working on a new site and have
>discovered that they use a different approach. I was surprised to find that
>they just plug in the port off one switch straight into the next switch with
>a crossover and off they go.
>This works but could someone point out the pitfalls off such an approach
>
>cheers
>
>Pat
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=18469&t=18442
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