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24-3
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 24 Configuring Trunking
Trunking Guidelines and Restrictions
Key Concepts
The trunking feature includes the following key concepts:
• TE port—If trunk mode is enabled in an E port and that port becomes operational as a trunking E
port, it is referred to as a TE port.
• TF port—If trunk mode is enabled in an F port (see the link 2 in Figure 24-2) and that port becomes
operational as a trunking F port, it is referred to as a TF port.
• TN port—If trunk mode is enabled (not currently supported) in an N port (see the link 1b in
Figure 24-2) and that port becomes operational as a trunking N port, it is referred to as a TN port.
• TNP port—If trunk mode is enabled in an NP port (see the link 2 in Figure 24-2) and that port
becomes operational as a trunking NP port, it is referred to as a TNP port.
• TF PortChannel—If trunk mode is enabled in an F PortChannel (see the link 4 in Figure 24-2) and
that PortChannel becomes operational as a trunking F PortChannel, it is referred to as TF
PortChannel. Cisco Port Trunking Protocol (PTP) is used to carry tagged frames.
• TF-TN port link—A single link can be established to connect an F port to an HBA to carry tagged
frames (see the link 1a and 1b in Figure 24-2) using Exchange Virtual Fabrics Protocol (EVFP). A
server can reach multiple VSANs through a TF port without inter-VSAN routing (IVR).
• TF-TNP port link—A single link can be established to connect an TF port to an TNP port using the
PTP protocol to carry tagged frames (see the link 2 in Figure 24-2). PTP is used because PTP also
supports trunking PortChannels.
Note The TF-TNP port link between a third-party NPV core and a Cisco NPV switch is
established using the EVFP protocol.
• A Fibre Channel VSAN is called Virtual Fabric and uses a VF_ID in place of the VSAN ID. By
default, the VF_ID is 1 for all ports. When an N port supports trunking, a PWWN is defined for each
VSAN and called as logical PWWN. In the case of MDS core switches, the PWWNs for which the
N port requests additional FC_IDs are called virtual PWWNs.
Trunking Guidelines and Restrictions
The trunking feature includes the following guidelines and restrictions:
• F ports support trunking in Fx mode.
Link Number Link Description
1a and 1b F port trunk with N port.
1
1. These features are not supported currently.
2 F port trunk with NP port.
3 F PortChannnel with NP port.
4 Trunked F PortChannel with NP port.
5 Trunking NP port with third-party core switch F port.
1
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