Trunking Misconfiguration Examples - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Trunking Guidelines and Restrictions
D r a f t Ve r s i o n 3 - 0 3 D e c 2 0 0 8 - C i s c o C o n f i d e n t i a l
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Trunking Misconfiguration Examples

If you do not configure the VSANs correctly, issues with the connection may occur. For example, if you
merge the traffic in two VSANs, both VSANs will be mismatched. The trunking protocol validates the
VSAN interfaces at both ends of a link to avoid merging VSANs (see
Figure 16-3
In this example, the trunking protocol detects potential VSAN merging and isolates the ports involved.
The trunking protocol cannot detect merging of VSANs when a third-party switch is placed in between
two Cisco MDS 9000 Family switches (see
Cisco MDS 9000 Family CLI Configuration Guide
16-4
The trunk-allowed VSANs configured for TE, TF, and TNP links are used by the trunking protocol
to determine the allowed active VSANs in which frames can be received or transmitted.
If a trunking enabled E port is connected to a third-party switch, the trunking protocol ensures
seamless operation as an E port.
Trunking F ports and trunking F PortChannels are not supported on the following hardware:
91x4 switches, if NPIV is enabled and used as the NPIV core switch.
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Generation 1 2-Gbps Fibre Channel switching modules.
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On core switches, the FC-SP authentication will be supported only for the physical FLOGI from the
physical PWWN.
No FC-SP authentication is supported by the NPV switch on the server F ports.
MDS does not enforce the uniqueness of logical PWWNs across VSANs.
DPVM is not supported on trunked F port logins.
The DPVM feature is limited to the control of the port VSAN, since the EVFP protocol does not
allow changing the VSAN on which a logical PWWN has done FLOGI.
The port security configuration will be applied to both the first physical FLOGI and the per VSAN
FLOGIs.
Trunking is not supported on F ports that have FlexAttach enabled.
On MDS 91x4 core switches, hard zoning can be done only on F ports that are doing either NPIV
or trunking. However, in NPV mode, this restriction does not apply since zoning is enforced on the
core F port.
VSAN Mismatch
Switch 1
Isolated
E port
VSAN 2
VSAN mismatch
Switch 2
E port
VSAN 3
Figure 16-4).
Chapter 16 Configuring Trunking
Figure 16-3).
OL-18084-01, Cisco MDS NX-OS Release 4.x