Information Technology Reference
In-Depth Information
Figure23-5 Cat 5K to Cat 5K, Using Fast Ethernet for ISL Trunking
Switch A
Switch B
Port 1/1
Port 1/1
Fast Ethernet link
Table23-2 ISL Trunking Issues
Possible Problem
Solution
Are the ports
trunking?
Use the
show trunk mod_num/port_num
command to
determine whether the ports are trunking.
1.
Trunking is not
supported.
1.
Issue the
show port capabilities mod_num/port_num
command to verify that your modules support trunking.
Trunking is not
configured.
Use the
set trunk mod_num/port_num desirable
on a
Catalyst to configure trunking.
1.
Verify that the
VTP domain
name has been
configured.
1.
Use the
show vtp domain
command to determine whether a
domain name has been configured.
All switches in a domain must have the same name. The name is
case-sensitive.
VTP domain
name is not
configured.
Set
vtp domain domain_name
.
1.
A VTP domain
password problem
has occurred.
1.
Use the
show vtp domain
command to determine whether a
password has been established. All switches must have the
same password. The passwords are case-sensitive.
Example of Configuring and Troubleshooting ISL Trunking on Catalyst 5000 and
6000 Family Switches
This section walks you through configuring and troubleshooting ISL trunking.
Tasks That Will Be Performed
In this section, you will perform these tasks:
•
Verify ISL support on the ports.
•
Connect the switches.
•
Verify that the ports are operational.
•
Assign IP addresses to the management ports.
•
Verify that the switches are not trunking over their link.
•
Ping from switch to switch.
•
Create a VLAN 2 in each switch.
•
Move the management interface (sc0) to VLAN 2.
