Imagine three switches: A, B, and C. A has a trunk to B and to C.
A ------------- B
|
|
|
C
B has only VLAN 1 and 2 with 100 hosts hanging off of it somewhere, all
in VLAN2. C has VLAN 1 and 5, with all hosts in 5. On those trunks,
A-B and A-C, all three VLANs are present. This is true even though
there are no hosts on B in VLAN 5 and no hosts on C in VLAN 2. Because
those VLANs are being trunked across those lines, any broadcasts or
multicasts in that VLAN are going to be transmitted across them. This
might not be a big deal in a small network but can become a problem as
your network grows.
The solution is to prune VLAN 2 from the A-C trunk and VLAN 5 from the
A-B trunk. This will eliminate unnecessary forwarding of broadcast and
multicast traffic to destinations that can't use it.
HTH,
John
>>> "[EMAIL PROTECTED]"
4/17/01 3:01:29 PM >>>
Does VTP pruning have to be enabled in order to eliminate broadcasts
on
desired switches? I thought VLANs already took care of that but
apparently, I'm reading a book that states that even though a client
sends out a broadcast message, every switch in the network receives
this
broadcast, even though some of the switches don't have any ports in
the
same VLAN. ?
jd
FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=988&t=984
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
