KB.15.15

Monitor port

NOTE: A trunk cannot be a monitor port. A monitor port

can monitor a static trunk but cannot monitor a dynamic

LACP trunk.

About configuring a static or dynamic trunk group

IMPORTANT: Configure port trunking before you connect the trunked links between switches.

Otherwise, a broadcast storm could occur. (If you need to connect the ports before configuring

them for trunking, you can temporarily disable the ports until the trunk is configured.)

The table on Table 9 describes the maximum number of trunk groups you can configure on the

switch. An individual trunk can have up to eight links, with additional standby links if you are using

LACP. You can configure trunk group types as follows:

Trunk Group MembershipTrunk Type

DynX (dynamic)TrkX (static)

YesYesLACP

NoYesTrunk

About enabling a dynamic LACP trunk group

In the default port configuration, all ports on the switch are set to disabled. To enable the switch

to automatically form a trunk group that is dynamic on both ends of the link, the ports on one end

of a set of links must be LACP Active. The ports on the other end can be either LACP Active or

LACP Passive. The active command enables the switch to automatically establish a (dynamic)

LACP trunk group when the device on the other end of the link is configured for LACP Passive.

Example

Figure 59 Criteria for automatically forming a dynamic LACP trunk

Dynamic LACP standby links

Dynamic LACP trunking enables you to configure standby links for a trunk by including more than

eight ports in a dynamic LACP trunk configuration. When eight ports (trunk links) are up, the

remaining links are held in standby status. If a trunked link that is "Up" fails, it is replaced by a

150 Port Trunking