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RE: EMULATE VTP PRUNING WITH SWITCHPORT TRUNK ALLOWED posted 08/29/2006
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Plukkie,


Switch 1 would add those vlan into requested list even you do not have
any host. this happen because you have an active trunk port between SW1
and SW2 which cause the SVI to up/up. see the output below..  vlan
5,7,46 have been pruned on SW1 due to lack of request from SW2 while
vlan 1,5,7,28,46,100 have been added into the SW1 requested list.



As a result Switch 2 can not prune those vlan 1,5,7,28,46,100 which
requested by SW1 and have to add those vlan into allow list..



same rules apply to the other switch..



pls correct me if am wrong.. thanks







Switch-1#sh vlan brief

VLAN Name                             Status    Ports
---- -------------------------------- ---------
-------------------------------
1    default                          active    Fa0/5, Fa0/6, Fa0/7,
Fa0/8
                                                Fa0/9, Fa0/10, Fa0/11,
Fa0/12
                                                Fa0/14, Fa0/15, Fa0/16,
Fa0/17
                                                Fa0/18, Fa0/19, Fa0/20,
Fa0/21
                                                Fa0/22, Fa0/23, Fa0/24,
Gi0/1
                                                Gi0/2
5    VLAN0005                         active    Fa0/4
7    VLAN0007                         active
28   VLAN0028                         active    Fa0/2
46   VLAN0046                         active    Fa0/3
100  VLAN0100                         active    Fa0/1
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup


Switch-1#sh ip int brief
Interface              IP-Address      OK? Method Status
Protocol
Vlan1                  unassigned      YES unset  administratively down
down
Vlan7                  10.10.10.1      YES manual up
up
FastEthernet0/1        unassigned      YES unset  up
up
FastEthernet0/2        unassigned      YES unset  up
up
FastEthernet0/3        unassigned      YES unset  up
up
FastEthernet0/4        unassigned      YES unset  up
up
FastEthernet0/5        unassigned      YES unset  up
up


Switch-1#sh int f0/13 pruning

Port        Vlans pruned for lack of request by neighbor
Fa0/13      5,7,46

Port        Vlan traffic requested of neighbor
Fa0/13      1,5,7,28,46,100


Regards,
Sean Khoo



________________________________

From: Plukkie [mailto:plukkie@xxxxxxxxx]
Sent: Tuesday, 29 August 2006 4:40 PM
To: Sean Khoo (AU)
Cc: Arun Arumuganainar; David Redfern (AU); ccielab@xxxxxxxxxxxxxx;
Jason Bartley (AU)
Subject: Re: EMULATE VTP PRUNING WITH SWITCHPORT TRUNK ALLOWED


Sean,

This is solution three from David:

Soltution3:
allows vlan traffic to other side that the OTHER side
has hosts in as well as all interface vlans on the other side.

The first part, correct, but what's the use to allow interface vlans
from the other side, while you don't have hosts in that vlan or neither
yourself an interface in that vlan?

gr


On 8/29/06, Sean Khoo (AU) <Sean.Khoo@xxxxxxxxxxxxx> wrote:


	I think the solution 3 is the correct solution if you want to
emulate
	vtp pruning.

	Regards,
	Sean Khoo

	-----Original Message-----
	From: Arun Arumuganainar [mailto:aarumuga@xxxxxxxxxxx]
	Sent: Monday, 28 August 2006 11:13 PM
	To: Plukkie; David Redfern (AU)
	Cc: ccielab@xxxxxxxxxxxxxx; Sean Khoo (AU); Jason Bartley (AU)
	Subject: Re: EMULATE VTP PRUNING WITH SWITCHPORT TRUNK ALLOWED

	Pruning will allow traffic on the trunk side only on couple of
occasions
	.

	1)  VLAN should locally assigned  or
	2)  Switch should act as a transit for those vlan .

	Second condition is does not apply in CCIE LAB environment . In
a two
	switch environment there is not question about switch to act as
a pure
	transit .

	Ideal solution would be ... On SW1 allow all vlan that assigned
locally
	on
	SW2 ( including VLAN 1...the default Vlan ) and vice versa .

	Thanks and Regards
	Arun

	----- Original Message -----
	From: "Plukkie" <plukkie@xxxxxxxxx>
	To: "David Redfern (AU)" <David.Redfern@xxxxxxxxxxxxx>
	Cc: <ccielab@xxxxxxxxxxxxxx>; "Sean Khoo (AU)"
	<Sean.Khoo@xxxxxxxxxxxxx>; "Jason Bartley (AU)"
	<Jason.Bartley@xxxxxxxxxxxxx>
	Sent: Monday, August 28, 2006 2:54 PM
	Subject: Re: EMULATE VTP PRUNING WITH SWITCHPORT TRUNK ALLOWED


	> Hi,
	>
	> I would presume only allowing the common vlans that are used
on both
	> switches, so that is 100 and 28.
	>
	> on both switches:
	> switchport trunk allowed vlan 28,100
	>
	> gr Plukkie
	>
	>
	> On 8/28/06, David Redfern (AU) <David.Redfern@xxxxxxxxxxxxx>
wrote:
	> >
	> > Guys,
	> >
	> > Struggling to find the correct way to emulate vtp pruning
using
	> > switchport trunk allowed vlan command..
	> >
	> > Question is from InternetExpert Lab 28 Also says to only
send the
	> > minumum amount of traffic necessary across these trunk links
	> >
	> >
	> >
	> > Eg,
	> >
	> > Sw1 has hosts in vlan 100,28,46,5
	> > Also has interface vlan 7 (but no interfaces in the vlan)
	> >
	> > Sw2 has hosts in vlans 34,100
	> > Also has interface vlan 8 and 28 (but no interfaces in the
vlan)
	> >
	> >
	> > What do you guys think is the correct solution.
	> >
	> > Solution 1.(only allows vlan traffic  to other side that
both
	> > switches have hosts in. eg 100) SW1.
	> > switchport trunk allowed vlan 100
	> >
	> > SW2
	> > switchport trunk allowed vlan 100
	> >
	> >
	> >
	> > Solution 2. (allows vlan traffic to other side that the
OTHER side
	> > has hosts in as well as interface vlans ((28) where this
traffic
	> > must traverse the trunk)
	> > SW1
	> > switchport trunk allowed vlan 34,100,28
	> >
	> > SW2
	> > switchport trunk allowed vlan 100,28,46,5
	> >
	> >
	> > Solution 3. (allows vlan traffic to other side that the
OTHER side
	> > has hosts in as well as all interface vlans on the other
side)
	> > SW1
	> > switchport trunk allowed vlan 34,100,28,8
	> >
	> > SW2
	> > switchport trunk allowed vlan 100,28,46,5,7
	> >
	> >
	> >
	> >
	> > Solution 4, (Their solution. Confused about the logic)
	> >
	> > SW1.
	> > switchport trunk allowed vlan 7.28,100
	> > SW2
	> > switchport trunk allowed vlan 8.28.100
	> >
	> >
	> > Or others
	> >
	> > Any ideas about the best way?
	> >
	> >
	> >
	> >

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