HP Cisco MDS 9120 Cisco MDS 9000 Family Fabric Manager Configuration Guide, Re - Page 463

Chapter 23 Configuring PortChannels PortChannel Configuration Send documentation comments to [email protected] Step 11 The following attributes are shown in Figure 23-12: • VSAN List-This gives a list of VSANs to which the ISLs belong. • Trunk Mode-You can enable trunking on the links in the PortChannel. Select trunking if your link is between TE ports. Select nontrunking if your link is between E ports. Select auto if you are not sure. • Force Admin, Trunk, Speed, and VSAN attributes to be identical-This check box ensures that the same parameter settings are used in all physical ports in the channel. If these settings are not identical, the ports cannot become part of the PortChannel. • Speed-The port speed values are auto, 1Gb, 2Gb, 4Gb, and autoMax2G. Click OK. The PortChannel is created. Note that it may take a few minutes before the new PortChannel is visible in the Fabric pane. About PortChannel Modes You can configure each PortChannel with a channel group mode parameter to determine the PortChannel protocol behavior for all member ports in this channel group. The possible values for a channel group mode are as follows. • ON (default)-The member ports only operate as part of a PortChannel or remain inactive. In this mode, the PortChannel protocol is not initiated. However, if a PortChannel protocol frame is received from a peer port, the software indicates its nonnegotiable status. This mode is backward compatible with the existing implementation of PortChannels in releases prior to Release 2.0(1b), where the channel group mode is implicitly assumed to be ON. In Cisco MDS SAN-OS Releases 1.3 and earlier, the only available PortChannel mode was the ON mode. PortChannels configured in the ON mode require you to explicitly enable and disable the PortChannel member ports at either end if you add or remove ports from the PortChannel configuration. You must physically verify that the local and remote ports are connected to each other. • ACTIVE-The member ports initiate PortChannel protocol negotiation with the peer port(s) regardless of the channel group mode of the peer port. If the peer port, while configured in a channel group, does not support the PortChannel protocol, or responds with a nonnegotiable status, it will default to the ON mode behavior. The ACTIVE PortChannel mode allows automatic recovery without explicitly enabling and disabling the PortChannel member ports at either end. Table 23-1 compares ON and ACTIVE modes. Table 23-1 Channel Group Configuration Differences ON Mode No protocol is exchanged. Moves interfaces to the suspended state if its operational values are incompatible with the PortChannel. ACTIVE Mode A PortChannel protocol negotiation is performed with the peer ports. Moves interfaces to the isolated state if its operational values are incompatible with the PortChannel. OL-16184-01, Cisco MDS SAN-OS Release 3.x Cisco MDS 9000 Family CLI Configuration Guide 23-11