Avaya Media Gateway G250, Administration Manual

Page: 317 / 840

Dynamic CAC
Issue 5 June 2008 317
Dynamic CAC
Dynamic Call Admission Control (CAC) provides enhanced control over WAN bandwidth. When
Dynamic CAC is enabled on an interface, the G250/G350 informs the MGC of the actual
bandwidth of the interface and instructs the MGC to block calls when the bandwidth is
exhausted.
Dynamic CAC is especially useful in situations where a primary link is down and a backup link
with less bandwidth than the primary link is active in its place. Without dynamic CAC, the MGC
is unaware that the interface has switched over to the backup link. Thus, the MGC is unaware of
the resulting changes in network topology and bandwidth available for the interface.
Consequently, the MGC might allow calls through the interface that require more than the
currently available bandwidth.
Note:
Note:
Dynamic CAC works in conjunction with the Avaya Communication Manager Call
Admission Control: Bandwidth Limitation (CAC-BL) feature. A related feature is
Inter-Gateway Alternate Routing (IGAR), which provides a mechanism to re-route
bearer traffic from the WAN to the PSTN under certain configurable conditions.
For more information on CAC-BL and IGAR, see
Administrator Guide for Avaya
Communication Manager , 03-300509.
You can enable dynamic CAC on the following interface types:
●
FastEthernet
●
Serial (PPP or frame relay)
●
GRE Tunnel
●
VLAN
Note:
Note:
Since VLAN interfaces are always up, configuring dynamic CAC on a VLAN
interface provides a means to have a default dynamic CAC bandwidth.
keepalive-icmp
timeout
Set the timeout (in seconds) for receiving the
keepalive response
show
keepalive-icmp
Display information about the extended
keepalive settings
Table 86: ICMP keepalive CLI commands (continued)
Root level
command Command Description
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