Cisco Systems DSC9148D8G48PK9 Manuel d'utilisateur télécharger pdf (Page 157)

5-3

Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide

OL-29284-01, Release 6.x

Chapter 5 Configuring Trunking

Information About Trunking

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 5-2) 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 5-2) 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 5-2) 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 5-2) 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 5-2) 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 5-2). 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 a 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 Protocols

The trunking protocol is important for trunking operations on the ports. The protocols enable the

following activities:

• Dynamic negotiation of operational trunk mode.

• Selection of a common set of trunk-allowed VSANs.

• Detection of a VSAN mismatch across an ISL.

Table 5-1 specifies the protocols used for trunking and channeling.

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. These features are not supported currently.

Link Number Link Description

1 2 ... 152 153 154 155 156 157 158 159 160 161 162 ... 235 236

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