From: Nick (seajay76@nate.com)
Date: Wed Jan 11 2006 - 14:47:13 GMT-3
Hi, all!!
"When you remove VLAN 1 from a trunk port, the interface continues to send
and receive management traffic, for example, Cisco Discovery Protocol (CDP),
Port Aggregation Protocol (PAgP), Link Aggregation Control Protocol (LACP),
Dynamic Trunking Protocol (DTP), and VLAN Trunking Protocol (VTP) in VLAN 1."
IMHO, I think it would be perfect if I remove the "in VLAN 1." at the end.
If I remote VLAN 1 from the trunk, what could exist "in VLAN 1"?
And, just Vic said, the management protocols are mostly port/switch types of traffic
to control trunking, channelling which is the infrastructure VLAN can play on.
What do you think ladies and gentlemen?
Regards,
Nick
----- Original Message -----
From: "easyman" <easyman@primetek.com.tw>
To: "'Hooman Parta'" <hooman@voipsol.com>; "'Victor Cappuccio'" <cvictor@protokolgroup.com>; <ccielab@groupstudy.com>
Sent: Wednesday, January 11, 2006 7:35 PM
Subject: RE: A Jazz at Level 2 in Vlan 1
>I think vtp prunning is wiser and more automatic than manually configure
> "allowed-vlan list" on trunk ports.
> All switches connected via trunk interfaces in the same vtp domain maintain
> the same "vtp prunning" status.
> But "allowed-vlan list" on trunk port allow you to do more felxible
> customization of allowd or notallowd vlan-lists.
> Because each trunk interface maintain it's own "allowed-vlan list".
>
>
>
> Regards
> Lin
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Hooman Parta
> Sent: Wednesday, January 11, 2006 11:26 AM
> To: 'Victor Cappuccio'; ccielab@groupstudy.com
> Subject: RE: A Jazz at Level 2 in Vlan 1
>
> Vic,
>
>
> Pruning list is only for VTP protocol not for all of the traffic. So for
> decreasing of extra traffic on VTP, pruning has been usedas they will be
> tx/rx on trunks.
>
> Removing VLAN will help to limit ANY traffic (user traffic) of the VLAN(s)
> on specific trunk as you mentioned.
>
> But for your question why the management traffic, as it mentioned in the
> document " As a result, no user traffic, including spanning-tree
> advertisements, is sent or received on VLAN 1" CDP,PagP, LACP, DTP, VTP are
> mostly port/switch types of traffic. Personally I think they put STP for
> security purposes on that category.
>
> My 2 cents
>
> Hooman
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Victor Cappuccio
> Sent: Tuesday, January 10, 2006 5:29 PM
> To: ccielab@groupstudy.com
> Subject: A Jazz at Level 2 in Vlan 1
>
> Hello People..
>
> Please help me to clarify this blur that I have:
>
> www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225seb/scg/swvlan.htm#w
> p1150302
>
> By default, a trunk port sends traffic to and receives traffic from all
> VLANs. All VLAN IDs, 1 to 4094, are allowed on each trunk.
>
> Switch#show int trunk
> <..>
> Port Vlans allowed on trunk
> Fa0/1 1-4094
> <..>
>
> Switch#show run interface fastEthernet 0/1 Building configuration...
>
> Current configuration : 132 bytes
> !
> interface FastEthernet0/1
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 2-4094
> switchport mode trunk
> end
>
> Switch#show int trunk
> <..>
> Port Vlans allowed on trunk
> Fa0/1 2-4094
> <..>
>
> Also says that: To reduce the risk of spanning-tree loops or storms, you can
> disable VLAN 1 on any individual VLAN trunk port by removing VLAN 1 from the
> allowed list. This is known as VLAN 1 minimization.
>
> ohh my god this make life a little bit harder.. Is there any hidden concept
> here about trunking, Q in Q or something similar?
>
> When you remove VLAN 1 from a trunk port, the interface continues to send
> and receive management traffic, for example, Cisco Discovery Protocol (CDP),
> Port Aggregation Protocol (PAgP), Link Aggregation Control Protocol (LACP),
> Dynamic Trunking Protocol (DTP), and VLAN Trunking Protocol (VTP) in VLAN 1.
>
>
> Why Sending then all this Management Traffic??
>
> Now it continues down, to a lot of stuff I could not process :D
>
> But Ok the concept is simple, helps reducing traffic, and increasing network
> bandwidth.
>
> But my question is then what is the difference between Pruning-Eligible List
> and removing Traffic from the vlans? Is there something bigger ??
>
> Thanks
> Victor.
>
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