From: Holmes (iamholmes@eml.cc)
Date: Sun Oct 02 2005 - 08:28:03 GMT-3
Thanks guys for the reply.
Switch#sh interfaces fastEthernet 0/2 switchport
Name: Fa0/2
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
<snip>
Now this is what's odd. I have been using only dot1q encapsulation.
I have the following configuration, but I get no replies
from the router, when I ping it (10.1.1.1 ) from the switch.
on the router, I have :
one#sh runn
<snip>
!
!
interface FastEthernet0/0
no ip address
no ip directed-broadcast
speed auto
half-duplex
!
interface FastEthernet0/0.1
encapsulation dot1Q 1
ip address 10.1.1.1 255.255.255.0
no ip redirects
no ip directed-broadcast
!
on the switch :
interface FastEthernet0/1
switchport mode access
no ip address
!
interface FastEthernet0/2
switchport mode trunk
no ip address
<snip>
interface Vlan1
ip address 10.1.1.2 255.255.255.0
no ip route-cache
!
ip default-gateway 10.1.1.1
ip http server
!
!
I scrapped the whole r-o-a-s idea, and configured the router as :
interface FastEthernet0/0
ip address 10.1.1.1 255.255.255.0
and there's no problem with reachability between the router and
switch. (I can see the other device on `sh cdp ne'. As soon as I
set up the sub-interfaces on the router and configured dot1q
encapsulation, I can't ping the switch from the router or vice-versa.
(I do have the gateway and VLAN1 ip configured correctly on the
switch). The other thing I noticed is that I dont see the other
device on the `sh cdp ne', after I make this change.
Any pointers ? Thanks again.
On Sun, 2 Oct 2005 12:12:42 +0100, "kevin gannon" <kevin@gannons.net>
said:
> I dont have a 2950 to hand but you might want to check that the
> port supports dot1q. Do a "show int cap" and this should should
> it to you.
>
> Regards
> Kevin
>
> On 10/2/05, Holmes <iamholmes@eml.cc> wrote:
> > Hi all -
> >
> > My 2950 switch is running only a 12.1 Catalyst IOS.
> >
> > I want to run a simple router-on-a-stick setup, but I can't find
> > any way to specify the kind of encapsulation I'm going to use on
> > the switch. (I've worked on this for more than 2 hours).
> > What am I missing here ?
> >
> > Switch(config-if)#switchport mode trunk
> > Switch(config-if)#switchport tr
> > Switch(config-if)#switchport trunk ?
> > allowed Set allowed VLAN characteristics when interface is in
> > trunking mode
> > native Set trunking native characteristics when interface is in
> > trunking
> > mode
> > pruning Set pruning VLAN characteristics when interface is in
> > trunking mode
> >
> > Switch(config-if)#switchport trunk
> >
> > Don't you normally have a
> > Switch(config-if)#switchport trunk encapsulation .. command ?
> >
> > Surely the IOS I'm using isn't that old. Anyone any idea whats wrong
> > here ?
> > I don't have access to the Cisco site to download an IOS, so I haven't
> > been
> > able to determine if its the IOS thats the problem.
> >
> > Switch#sh ver
> > Cisco Internetwork Operating System Software
> > IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(13)EA1, RELEASE
> > SOFTWARE
> > (fc1)
> > Copyright (c) 1986-2003 by cisco Systems, Inc.
> > Compiled Tue 04-Mar-03 02:14 by yenanh
> > Image text-base: 0x80010000, data-base: 0x805A8000
> >
> > ROM: Bootstrap program is CALHOUN boot loader
> >
> > Switch uptime is 2 hours, 59 minutes
> > System returned to ROM by power-on
> > System image file is "flash:/c2950-i6q4l2-mz.121-13.EA1.bin"
> >
> > cisco WS-C2950G-24-EI (RC32300) processor (revis
> > 02:59:20: %SYS-5-CONFIG_I: Configured from console by consoleion
> > G0) with 20839K bytes of memory.
> > Processor board ID FOC0718Y01J
> > Last reset from system-reset
> > Running Enhanced Image
> > 24 FastEthernet/IEEE 802.3 interface(s)
> > 2 Gigabit Ethernet/IEEE 802.3 interface(s)
> >
> > 32K bytes of flash-simulated non-volatile configuration memory.
> > Base ethernet MAC Address: 00:0C:CE:D4:DD:C0
> >
> >
> > Thanks for any pointers.
> >
> >
> > --
> > Holmes
> > iamholmes@eml.cc
> >
> > --
> > http://www.fastmail.fm - Choose from over 50 domains or use your own
> >
> > _______________________________________________________________________
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> >
> >
-- Holmes iamholmes@eml.cc-- http://www.fastmail.fm - One of many happy users: http://www.fastmail.fm/docs/quotes.html
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