Lacp Short Period Time Intervals - Cisco 6000 Series Configuration Manual

Configuring Link Bundling
The information from the peer system is combined with the information from the local system to determine
the compatibility of the links configured to be members of a bundle.
The MAC address of the first link attached to a bundle becomes the MAC address of the bundle itself. The
bundle uses this MAC address until that link (the first link attached to the bundle) is detached from the bundle,
or until the user configures a different MAC address. The bundle MAC address is used by all member links
when passing bundle traffic. Any unicast or multicast addresses set on the bundle are also set on all the member
links.
Note
We recommend that you avoid modifying the MAC address, because changes in the MAC address can affect
packet forwarding.

LACP Short Period Time Intervals

As packets are exchanged across member links of a bundled interface, some member links may slow down
or time-out and fail. LACP packets are exchanged periodically across these links to verify the stability and
reliability of the links over which they pass. The configuration of short period time intervals, in which LACP
packets are sent, enables faster detection and recovery from link failures.
Short period time intervals are configured as follows:
• In milliseconds
• In increments of 100 milliseconds
• In the range 100 to 1000 milliseconds
• The default is 1000 milliseconds (1 second)
• Up to 64 member links
• Up to 1280 packets per second (pps)
After 6 missed packets, the link is detached from the bundle.
When the short period time interval is not configured, LACP packets are transmitted over a member link every
30 seconds by default.
When the short period time interval is configured, LACP packets are transmitted over a member link once
every 1000 milliseconds (1 second) by default. Optionally, both the transmit and receive intervals can be
configured to less than 1000 milliseconds, independently or together, in increments of 100 milliseconds (100,
200, 300, and so on).
When you configure a custom LACP short period transmit interval at one end of a link, you must configure
the same time period for the receive interval at the other end of the link.
Note
You must always configure the transmit interval at both ends of the connection before you configure the
receive interval at either end of the connection. Failure to configure the transmit interval at both ends first
results in route flapping (a route going up and down continuously). When you remove a custom LACP short
period, you must do it in reverse order. You must remove the receive intervals first and then the transmit
intervals.
Interface and Hardware Component Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
LACP Short Period Time Intervals
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