Cisco N5K-C5010P-BF Troubleshooting Guide - Page 114
Nexus 5000 trunk port does not connect to upstream SAN switch
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VSANs Chapter 5 Troubleshooting SAN Switching Issues Send document comments to [email protected]. 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: • 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. 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 Vsan Admin Admin Status SFP Oper Oper Port Mode Trunk Mode Speed Channel Mode (Gbps) fc2/3 1 E on isolated swl -- -- switch(config-if)# show interface fc 2/3 fc2/3 is down (Isolation due to no common vsans with peer on trunk) 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 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: • No common VSANs on both switches. • The trunk allowed VSAN members that do not contain common members. 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 4 16:06:04 2010 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 4 16:20:07 2010 5-42 Cisco Nexus 5000 Series Troubleshooting Guide OL-25300-01