7705 SAR Interfaces
504
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
When a failure in a LAG is detected, it is immediately advertised to the rest of the system, but
subsequent failures are not advertised to upper layers until the hold-time down interval has
expired.
Specifying a hold time is especially useful in a 1:1 active/standby configuration because the
time between detecting that the active link in the LAG is down and the time needed to activate
the standby link is very short. The hold time prevents the LAG from being operationally down
when switching between the active and standby link.
The no form of this command removes any hold time configured.
Default no hold-time
Parameters hold-down-time — specifies, in tenths of seconds, the hold time before a failure is
reported
Values 0 to 2000
lacp
Syntax lacp [mode] [administrative-key admin-key]
no lacp
Context config>lag
Description This command specifies the LACP mode of the LAG. By default, the LACP mode is not set.
Per the IEEE 802.1AX-2008 (IEEE 802.3ad) standard, the Link Aggregation Control Protocol
(LACP) provides a standardized means for exchanging information between network devices
using LAGs. LACP operates in two modes: passive and active. At least one partner must
operate in active mode. For example, if the mode on the CE end is passive, the LACP mode
on the 7705 SAR end must be active.
The no form of this command disables LACP.
Default no lacp
Parameters mode — specifies the mode in which LACP operates
Values passive — starts transmitting LACP packets only after receiving
packets
active — initiates the transmission of LACP packets
admin-key — specifies an administrative key value to identify the aggregation group on
each port configured to use LACP. This value should be configured only in
exceptional cases. If it is not specified, a random key is assigned.
Values 1 to 65535
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