Configuring Trunk Groups and Dynamic Link Aggregation
December 2005 © Foundry Networks, Inc. 10 - 23
About Blocked Ports
Foundry devices can block traffic on a port or shut down a port that is part of a trunk group or aggregate link, when
a port joins a trunk group and the port on the other end of the link shuts down or stops transmitting LACP packets.
Depending on the timeout value set on the port, the link aggregation information expires. If this occurs, the
Foundry device shuts down the port and notifies all the upper layer protocols that the port is down.
Foundry devices can also block traffic on a port that is initially configured with link aggregation. The port is
blocked until it joins a trunk group. In this case, traffic is blocked, but the port is still operational.
A port remains blocked until one of the following events occur:
• Both ports in the aggregate link have the same key
• LACP brings the port back up
• The port joins a trunk group
Displaying Link Aggregation and Port Status Information
Use the show link-aggregation command to determine the operational status of ports associated with aggregate
links.
To display the link aggregation information for a specific port, enter a command such as the following at any level
of the CLI:
The command in this example shows the link aggregation information for port 1/1.
To display the link aggregation information for all ports on which link aggregation is enabled, enter the following
command at any level of the CLI:
Syntax: show link-aggregation [ethernet [<slotnum>/]<portnum>]
The <slotnum> parameter is required on chassis devices.
Use ethernet <portnum> to display link-aggregation information for a specific port.
NOTE: Ports that are configured as part of an aggregate link must also have the same key. For more information
about assigning keys, see the section “Link Aggregation Parameters” on page 10-18.
FastIron SuperX Router(config-mif-1/1-1/8)# show link-aggregation ethernet 1/1
System ID: 00e0.52a9.bb00
Port [Sys P] [Port P] [ Key ] [Act][Tio][Agg][Syn][Col][Dis][Def][Exp] [Ope]
1/1 0 0 0 No L No No No No No No Ope
FastIron SuperX Router(config)# show link-aggregation
System ID: 00e0.52a9.bb00
Port [Sys P] [Port P] [ Key ] [Act][Tio][Agg][Syn][Col][Dis][Def][Exp][Ope]
1/1 1 1 0 No L Agg Syn No No Def Exp Ope
1/2 1 1 0 No L Agg Syn No No Def Exp Ina
1/3 1 1 0 No L Agg Syn No No Def Exp Ina
1/4 1 1 0 No L Agg Syn No No Def Exp Blo
1/5 1 1 1 No L Agg No No No Def Exp Ope
1/6 1 1 1 No L Agg No No No Def Exp Ope
1/7 1 1 1 No L Agg No No No Def Exp Dwn
1/8 1 1 1 No L Agg No No No Def Exp Dwn
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