From: Joseph Saad (joseph.s.saad@gmail.com)
Date: Wed Jul 25 2007 - 02:36:18 ART
I doubt you can treat those 2 VLAN's as directly connected.
I can only think of doing 2 thing:
Enable IP routing on the 2 switches
during pinging specify the Vlan interface as the source.
Also do "Debug ip icmp" on the receiving end of the ping to see if the
packets are reached or not.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
subodh.rawat@wipro.com
Sent: Wednesday, July 25, 2007 8:43 AM
To: ccielab@groupstudy.com
Subject: Basic switching trunking question..please answer
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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