From: Djerk Geurts (djerk@djerk.nl)
Date: Wed Jul 25 2007 - 06:53:45 ART
Be carefull there as this is not my experience. Trunk interfaces, even
explicitly allowing vlans does not add them to the vlan database on at least
my 3560, 3750 and 3548... Different SW and models might behave differently,
it's definetely something to verify when in the lab :)
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of Mounir Mohamed
> Sent: woensdag 25 juli 2007 8:54
> To: wilfred d'souza
> Cc: subodh.rawat@wipro.com; ccielab@groupstudy.com
> Subject: Re: Basic switching trunking question..please answer
>
> The SVI interface will get up/up if the at least one port
> assigned to the
> VLAN or when there is trunk interface up/up
>
> On 7/25/07, wilfred d'souza <wilfred_thegr8@yahoo.co.in> wrote:
> >
> > Hello Subodh,
> >
> > Try assigning the Vlans to any ethernet interface on both
> the switches and
> > then try pinging...
> >
> > Let me know if it works
> >
> > Regards,
> > Wilfred
> >
> > subodh.rawat@wipro.com wrote: Hi Champs,
> >
> > A basic switching problem I am facing. Please see the diagram below:
> >
> >
> > --- f1/7 f1/7 ---
> > |sw1|--------------------------------|sw2|
> > --- dot1Q Trunk ---
> >
> >
> > Switch 1 is VTp Server with domain CISCO
> > Switch 2 is VTP Client with domain CISCO
> > port f1/7 is configured as Dot1q encapsulation on both the switches.
> > Only one VLAN, i.e. VLAN 3 is added on Sw1 and Same is
> reflected in Sw2
> > too when I see "show vtp status"
> > and "show vlan brief" command. Please note that this VLAn is not
> > associated with any physical interface of switch.
> >
> > When I see "sh int fa1/7 trunk" on both the switches, it shows as
> > trunking with dot1q encapsulation.
> >
> > IP address of VLAn 3 on SW1 is 3.3.3.1/24 while on sw2 is
> 3.3.3.2/24.
> >
> > "sh ip int br" also shows up,up for fa1/7 and vlan 3.
> >
> > I am not able to ping 3.3.3.1 from sw2 and 3.3.3.2 from
> sw1. However, I
> > can ping Ip of own switch, i.e. 3.3.3.2 from sw2 and
> 3.3.3.1 from sw1.
> >
> > Can somebody tell me what is wrong with my configuration?
> >
> > Another good thing is that, when I see "show cdp entry *"
> from either
> > switches, it shows information about other switch. e.g.
> when I see "show
> > cdp entry *" from sw1, it shows IP address of 3.3.3.2 (of
> sw2) in its
> > CDP database. It means layer 2 is working perfect and
> trunking is also
> > perfect. Trunking is working fine can be verified from the
> result that
> > VLAN 3 is present on sw2 which is VTP client for CISCO VTP domain.
> >
> > I am not sure why I am not able to ping VLAN 3 IP address
> of each other
> > switches.
> >
> >
> >
> > My configuration is below:
> >
> > Sw1
> > interface FastEthernet1/7
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface Vlan3
> > ip address 3.3.3.1 255.255.255.0
> >
> > Sw2
> > interface FastEthernet1/7
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface Vlan3
> > ip address 3.3.3.2 255.255.255.0
> >
> >
> > CDP output:
> > sw1#sh cdp entry *
> > -------------------------
> > Device ID: sw2
> > Entry address(es):
> > IP address: 3.3.3.2
> > Platform: Cisco 3640, Capabilities: Router Switch IGMP
> > Interface: FastEthernet1/7, Port ID (outgoing port):
> FastEthernet1/7
> > Holdtime : 128 sec
> >
> > Version :
> > Cisco IOS Software, 3600 Software (C3640-IS-M), Version
> 12.4(8), RELEASE
> > SOFTWAR
> > E (fc1)
> > Technical Support: http://www.cisco.com/techsupport
> > Copyright (c) 1986-2006 by Cisco Systems, Inc.
> > Compiled Mon 15-May-06 16:27 by prod_rel_team
> >
> > advertisement version: 2
> > VTP Management Domain: 'cisco'
> > Duplex: full
> >
> >
> > Regards
> > Subodh
> >
> >
> >
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> --
> Best Reagrds,
> Mounir Mohamed
>
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