Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual page 114

VSANs
S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .
Nexus 5000 trunk port does not connect to upstream SAN switch
The Nexus 5000 trunk port does not connect to the upstream SAN switch because:
•
•
•
•
By examining the interface state and querying the interface, the issue is displayed as shown in the
following example.
Example:
switch(config-if)# show interface brief
-------------------------------------------------------------------------------
Interface
fc2/3
switch(config-if)# show interface fc 2/3
fc2/3 is down (Isolation due to no common vsans with peer on trunk)
Possible Cause
The VSAN allow list for both interfaces is not the same. Specifically, there is no common VSAN allowed
on both interfaces.
This situation might be caused by the following:
•
•
In the example, the trunk VSAN allow list on the Nexus 5000 and MDS FC interfaces do not match.
Solution
Determine the connected ports and resolve the allowed VSANs on the trunk for both FC interfaces.
Example:
switch(config-if)# show run interface fc 2/3
!Command: show running-config interface fc2/3
!Time: Wed Aug
version 4.2(1)N1(1)
interface fc2/3
switchport mode E
switchport trunk allowed vsan 1
no shutdown
switch(config-if)# show run interface fc 1/1
!Command: show running-config interface fc1/1
!Time: Wed Aug
Cisco Nexus 5000 Series Troubleshooting Guide
5-42
Status of the trunk port connected to the upstream switch is isolated.
The switch port trunk mode is enabled on both sides.
Physical cabling has been checked and verified.
Ports are up on both switches.
Vsan Admin Admin
Mode Trunk
Mode
1 E on
Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)
Port WWN is 20:43:00:0d:ec:da:6e:00
Admin port mode is E, trunk mode is on
No common VSANs on both switches.
The trunk allowed VSAN members that do not contain common members.
4 16:06:04 2010
4 16:20:07 2010
Chapter 5
Status SFP
isolated swl
Troubleshooting SAN Switching Issues
Oper Oper Port
Mode Speed Channel
(Gbps)
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OL-25300-01