From: Larry Letterman (lletterm) (lletterm@cisco.com)
Date: Sun Oct 07 2007 - 04:13:50 ART
mani,
The same vlans are on each trunk..if trunk 1 fails, the same vlans are
allowed on the failover trunk..
We have had fiber links go down due to failures and they switch with no
problem..
####################################
Larry Letterman
Cisco Systems
Richardson,Tx
469-255-0224
####################################
# -----Original Message-----
# From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
# Behalf Of mani poopal
# Sent: Monday, May 09, 2005 8:19 PM
# To: Larry Letterman (lletterm); ccie2be; ccielab@groupstudy.com
# Subject: Re: spanning-tree vlan 10 port-priority vs swithport
# allowed vlan
#
# Larry,
#
# But when you hardcode allowed vlans(say vlan 2,3,4 over fa
# 0/23 and vlan 4,5,6 over fa 0/24), If one link fails(say fa
# 0/24), I don't think vlan 4,5,6 can traverse over fa 0/23
# because you have hard coded the allowed vlans. Have you ever
# tried sutting down one trunk.
#
# Mani
#
# Larry Letterman <lletterm@cisco.com> wrote:
# I dont think so , Mani...all our switches have two trunks,
# one to gw1 and one to gw2.
# The 35xx switches are all using switchport trunk with vlan
# allowed. if one trunk fails the other trunk becomes unblocked
# in stp and takes over. The same vlans are allowed on both
# trunks, so I dont see how it wont failover....
#
# ############################
# Larry Letterman
# Cisco Systems
# ############################
# ----- Original Message -----
# From: mani poopal
# To: Larry Letterman ; ccie2be ; ccielab@groupstudy.com
# Sent: Monday, May 09, 2005 6:54 PM
# Subject: Re: spanning-tree vlan 10 port-priority vs swithport
# allowed vlan
#
#
# Hi Larry,
#
# As Tim said, if the trunk configured with switch port allowed
# vlan and if that trunk fails, there is no failover(to other
# trunk), but when you use port-priority on the root switch(or
# cost on non root switch), there is an effective failover.
# But when you have only one trunk, you can manipulate what
# vlan's traverses across the trunk. I think at your place you
# have only one trunk between the switches.
#
# thanks
#
# Mani
#
# Larry Letterman <lletterm@cisco.com> wrote:
# we use switcvhport vlan allowed inside cisco...in case you
# are wondering..
#
# ############################
# Larry Letterman
# Cisco Systems
# ############################
# ----- Original Message -----
# From: "mani poopal"
# To: "ccie2be" ;
# Sent: Monday, May 09, 2005 6:16 PM
# Subject: RE: spanning-tree vlan 10 port-priority vs swithport
# allowed vlan
#
#
# > Hi Tim,
# >
# > Port priority is better switchport allowed vlan method.
# Just curious
# > what
# method cisco likes, hopefully port priority method.
# >
# > As always thanks
# >
# > Mani
# >
# > ccie2be wrote:
# > Mani,
# >
# > Come on, guy. I know you know which is better.
# >
# > Think about what happens if one of the links goes down with
# each method.
# >
# > Tim
# >
# > -----Original Message-----
# > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
# On Behalf
# > Of
# mani
# > poopal
# > Sent: Monday, May 09, 2005 6:44 PM
# > To: ccielab@groupstudy.com
# > Subject: spanning-tree vlan 10 port-priority vs swithport
# allowed vlan
# >
# > Hi Group,
# > I have a question in tunking.
# > -Asssume sw1 is connected to sw2 via fa 0/23 and fa 0/24 both isl
# > trunking(not etherchannel) -There are vlan 10, 20 and 30 defined.
# > -For all the vlan sw1 is the root
# >
# > If the task ask us to send the vlan 10 through fa 0/24
# trunk(default
# > it
# will
# > go through fa 0/23 trunk), what is the solutions. Please
# look at the
# > following both solutions and give your thoughsts
# >
# > method1:
# > sw1:
# > int fa 0/24
# > spannig-tree vlan 10 port-priority 96 (less than 128)
# >
# > mehod2:
# > sw1/sw2
# > int fa 0/24
# > switchport trunk allowed vlan 10
# > int fa 0/23
# > switchport trunk allowed vlan 20,30
# >
# > guys what is the difference between both methods, according to my
# knowledge,
# > both accomplishes the same goal, any thoughts.
# >
# > thanks
# >
# > Mani
# >
# >
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