From: Guyler, Rik (rguyler@shp-dayton.org)
Date: Mon Oct 03 2005 - 11:12:27 GMT-3
2950's do not support ISL, only dot1q. When you setup a trunk, the dot1q is
implied so that's why you don't get to enter it manually.
Rik
-----Original Message-----
From: Holmes [mailto:iamholmes@eml.cc]
Sent: Sunday, October 02, 2005 8:21 AM
To: kevin gannon
Cc: ccielab@groupstudy.com
Subject: Re: Simple router-on-a-stick question.
Thanks for replying, Kevin. Unfortunately, my IOS doesn't have that option :
rtr(config)#int fa0/0.1
rtr(config-subif)#encapsulation dot1Q ?
<1-4095> IEEE 802.1Q VLAN ID required, range 1 - 0xFFF.
one(config-subif)#encapsulation dot1Q 1 ?
<cr>
What puzzles me is why the change in cdp neighbor status when I move from a
physical interface to a sub-interface.
Is encapsulation not the problem ? Someone ... please !
I've wasted a perfectly splendid sunday afternoon on this problem :-)
My IOS is a little dated -- but then this isn't a new feature either :
one#sh ver
Cisco Internetwork Operating System Software IOS (tm) C2600 Software
(C2600-JS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2) Copyright (c)
1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 02:36 by phanguye Image text-base: 0x80008088,
data-base: 0x80F3FA60
ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
one uptime is 1 hour, 57 minutes
System returned to ROM by power-on
System image file is "flash:c2600-js-mz.120-7.T"
On Sun, 2 Oct 2005 12:59:40 +0100, "kevin gannon" <kevin@gannons.net>
said:
> Not sure what the sw config looks like but you might want to try
>
> int f0/0.1
> encapsulation dot1Q 1 native
>
> Regards
> Kevin
>
> On 10/2/05, Holmes <iamholmes@eml.cc> wrote:
> > 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
> > > >
> > > > --
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> > --
> > Holmes
> > iamholmes@eml.cc
> >
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