Version 6.6 193 October 2014
Installation & Operation Manual 26. Connecting the Media Gateway to the IP Network
Destination IP – packets are distributed based on the last three bits of the
Destination IP address; this rule is recommended for use when there is
communication with a large number of Media Gateway and/or endpoints and their
destination IP addresses are evenly distributed.
Source XOR Destination IP – packets are distributed based on the last three
bits of the Source IP address XOR'ed with the last three bits of the Destination IP
address; this rule is not recommended for use, due to its complexity.
26.2.6.3 Link Aggregation Control Protocol
Link Aggregation Control Protocol (LACP) provides a standardized means of
exchanging information between Partner Systems on a link, allowing each system to
reach agreement on the identity of the Link Aggregation Group to which the link
belongs. Transmission of LACPDUs occurs either as a result of a periodic
transmission or as a result of changes to the Actor's state information, which needs to
be communicated to the Partner. The periodic transmission may occur at a Short
timeout (1 sec.) or a Long timeout (30 sec.), which is determined by the Link
Aggregation Timeout configuration parameter.
Note: This protocol is only supported for the ES/6600 switch, not for the ES-2
switch.
26.2.6.4 Aggregated Link Failure Detection
Use of aggregated links provides additional availability for an IP network connection.
This feature supplements the regular high availability mechanism that switches from
one Ethernet Switch (ES) board to another when an uplink failure is detected. For
aggregated links, failure detection is performed as follows:
Table
26-1: Aggregated Link Failure Detection
Initial State Event Taken Action & New State
1
st
ES board is active
All 3 aggregated links are up on
both ES boards.
Failure of one of the
aggregated links on the
1
st
ES board.
Switchover to the 2
nd
ES board (where
all aggregated links are up)
2
nd
ES board is active
2 of 3 aggregated links are up
on 1
st
ES board; all aggregated
links are up on the 2
nd
ES
board.
Failure of one of the
aggregated links on the
2
nd
ES board.
The Mediant 8000 continues to use
the 2
nd
ES board as active.
2
nd
ES board is active
2 of 3 aggregated links are up
on both ES boards.
Failure of another
(second) aggregated link
on the 2
nd
ES board.
The Mediant 8000 continues to use
the 2
nd
ES board as active (even
though the amount of available
aggregated links on the 1
st
ES board is
higher than on the 2
nd
ES board).
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