HP Cisco MDS 9134 Cisco MDS 9000 Family Fabric Manager Configuration Guide - R - Page 548

Trunking Guidelines and Restrictions Chapter 24 Configuring Trunking Send documentation comments to [email protected] • 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. - Generation 1 2-Gbps Fibre Channel switching modules. • 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. 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 24-3). Figure 24-3 VSAN Mismatch Switch 1 E port VSAN 2 Isolated Switch 2 E port VSAN 3 85471 VSAN mismatch 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 Figure 24-4). 24-4 Cisco MDS 9000 Family Fabric Manager Configuration Guide OL-17256-03, Cisco MDS NX-OS Release 4.x