From: Michael Stout (michaelgstout@hotmail.com)
Date: Tue Aug 08 2006 - 22:54:01 ART
Switching is not my strongest topic. but I'll take a blind stab at it.
if you use the natural interface e0/0 and apply an ip address to it you
will have to call that vlan the native vlan on the switch. This is where
it gets a bit cloudy for me. You can use the switch acc vlan 1234 command
on the switchport in addition to the switch trunk encap dot1q command.
Example 1
If you create all sub interfaces, you should be able pass all of your
vlans over the trunk without creating a native vlan. Example 2
router
inter ether 0/0
ip address 10.0.0.1 255.0.0.0
description this is vlan 10
interface e0/0.172
encapsulation dot1 172
ip add 172.16.0.1 255.255.0.0
Switch
interface fas 0/0
switch tr en do
sw mo trunk
sw trunk allow vlan 10,172
sw acc vlan 10
switch trunk native vlan 10
description this accces vlan and native vlan may be overkill but it will
work.
10 is native because the natural interface does not apply a vlan tag.
Now you can see that if router connects to another ethernet in vlan 10
with address 10.0.0.2/8 your traffic will pass.
Example 2
straight forward router on a stick.
PS
Careful about calling the internetworkexpert stuff out of name you migh
get a routing and switchig weakling when there are true router gods on
this list.
--------------------------------------------------------------------
From: "devecchio" <devecchio.turner@sbcglobal.net>
Reply-To: "devecchio" <devecchio.turner@sbcglobal.net>
To: "'Brian Dennis'" <bdennis@internetworkexpert.com>,
<ccielab@groupstudy.com>
CC: "'Joshua'" <joshualixin@gmail.com>, "'Hough, Earl'"
<Earl.Hough@sarcom.com>
Subject: RE: IP Expert Lab 10 Affordable Alternatives LAB 10
Date: Tue, 8 Aug 2006 14:43:16 -0500
Yes, it is an internetworkexpert workbook (LAB 10). Cisco suggest
this is
related to bug ID CSCds42715. I disabled fast switching (defaults to
off on
2600) via the no ip route-cache command and it still does not work. I
just
took the native vlan stuff off...my lab is in 8 weeks and I do not
have the
time to play with it :o)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
Brian Dennis
Sent: Tuesday, August 08, 2006 2:07 PM
To: devecchio; ccielab@groupstudy.com
Cc: Joshua
Subject: RE: IP Expert Lab 10 Affordable Alternatives LAB 10
You can experience problems trunking on 10meg Ethernet interfaces
when
using a native VLAN other than 1. Try removing the native VLAN or
changing the native VLAN to 1.
Also what workbook is this from? It looks like Internetwork Expert's
Lab 10 ;-)
HTH,
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
devecchio
Sent: Tuesday, August 08, 2006 11:47 AM
To: ccielab@groupstudy.com
Cc: 'Joshua'
Subject: IP Expert Lab 10 Affordable Alternatives LAB 10
Team,
In lab 10 router 4 has 2 Ethernet interfaces.. My 2600 series router
has
only one interface so I am trunking 2 vlans to that routerss
interface
by
creating sub interfaces with vlan tags etc. I can ping the switch's
interface vlan 100 from router 4 but I can not 204.12.1.254 (BB3)
from
router 4. If I remove the native vlan tags everything works fine.
Evidently
there is a gap in my native vlan knowledge so will someone please
lend a
hand to help me understand. If I figure it out before anyone responds
I'll
be sure to post my findings..
The I am having the following problem and perhaps it is a
misunderstanding
of the technology.
Router 4 has the following configuration
!
interface Ethernet0/0
no ip address
half-duplex
!
interface Ethernet0/0.43
encapsulation dot1Q 43 native
ip address 204.12.1.4 255.255.255.0
!
interface Ethernet0/0.100
encapsulation dot1Q 100
ip address 164.1.47.4 255.255.255.0
The 3550 has this configuration for router 4s uplink
!
Rack1SW1#show run int fa0/4
Building configuration...
Current configuration : 189 bytes
!
interface FastEthernet0/4
switchport trunk encapsulation dot1q
switchport trunk native vlan 43
switchport trunk allowed vlan 43,100
switchport mode trunk
switchport nonegotiate
end
Rack1SW1#
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