9-15
Optimizing Traffic Flow with Port Controls, Port Trunking, and Port-Based Priority
Port Trunking
Spanning Tree :
Spanning Tree operates as a global setting on the switch (one instance of Spanning Tree per switch).
However, you can adjust Spanning Tree parameters on a per-port basis. A static trunk of any type appears in the Spanning
Tree configuration display, and you can configure Spanning Tree parameters for a static trunk in the same way that you
would configure Spanning Tree parameters on a non-trunked port. (Note that the switch lists the trunk by name—such
as
Trk1
—and does not list the individual ports in the trunk.) For example, if ports C1 and C2 are configured as a static
trunk named
Trk1
, they are listed in the Spanning Tree display as
Trk1
and do not appear as individual ports in the Spanning
Tree displays.
When Spanning Tree forwards on a trunk, all ports in the trunk will be forwarding. Conversely, when Spanning Tree blocks
a trunk, all ports in the trunk are blocked.
Note:
A dynamic LACP trunk operates only with the default Spanning Tree settings and does not appear in the Spanning
Tree configuration display
or
show ip igmp
listing
.
If you remove a port from a static trunk, the port retains the same Spanning Tree settings that were configured for the trunk.
IP Multicast Protocol (IGMP):
A static trunk of any type appears in the IGMP configuration display, and you can configure
IGMP for a static trunk in the same way that you would configure IGMP on a non-trunked port. (Note that the switch lists
the trunk by name—such as
Trk1
—and does not list the individual ports in the trunk.) Also, creating a new trunk
automatically places the trunk in IGMP Auto status if IGMP is enabled for the default VLAN. A dynamic LACP trunk
operates only with the default IGMP settings and does not appear in the IGMP configuration display or
show ip igmp
listing.
VLANs:
Creating a new trunk automatically places the trunk in the DEFAULT_VLAN, regardless of whether the ports in
the trunk were in another VLAN. Similarly, removing a port from a trunk group automatically places the port in the default
VLAN. You can configure a static trunk in the same way that you configure a port for membership in any VLAN.
Note:
For a dynamic trunk to operate in a VLAN other than the default VLAN (DEFAULT_VLAN), GVRP must be enabled.
See “Trunk Group Operation Using LACP” on page 9-25.
Port Security:
Trunk groups (and their individual ports) cannot be configured for port security, and the switch excludes
trunked ports from the
show port-security
listing. If you configure non-default port security settings for a port, then
subsequently try to place the port in a trunk, you will see the following message and the command will not be executed:
< port-list >
Command cannot operate over a logical port.
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.
In this example showing
part of the
show spanning-
tree
listing, ports C1 and C2
are members of TRK1 and
do not appear as individual
ports in the port
configuration part of the
listing.
Summary of Contents for ProCurve 4104GL
Page 2: ......
Page 26: ...xxiv Getting Started Need Only a Quick Start ...
Page 34: ...1 8 Selecting a Management Interface Advantages of Using HP TopTools for Hubs Switches ...
Page 50: ...2 16 Using the Menu Interface Where To Go From Here ...
Page 172: ...8 24 Time Protocols SNTP Messages in the Event Log ...
Page 240: ...10 30 Configuring for Network Management Applications CDP ...
Page 288: ...11 48 Port Based Virtual LANs VLANs and GVRP GVRP ...
Page 480: ...C 38 Troubleshooting Restoring a Flash Image ...
Page 486: ...D 6 MAC Address Management Determining MAC Addresses ...
Page 490: ......
Page 502: ...12 Index ...
Page 503: ......