Installation & Operation Manual 222 Document # LTRT-92224
Mediant 8000
Note: In a temporary lab environment, it is possible to connect uplinks of both ES
boards to the same external Layer 3 Switch or Router. However such a
configuration does not provide redundant IP network connection for the Mediant
8000 and therefore should not be used for live deployments.
26.7.3.1 Configuring HSRP/VRRP Protocols on External Layer 3 Switches
The following HSRP/VRRP configuration should be performed on the external Layer 3
switches to which the Mediant 8000 is connected:
The HSRP/VRRP routing between the external Layer 3 switches should be
configured per VLANs and not per port.
The HSRP/VRRP switches priority should be configured with the outside network
ports (connected to the WAN) and not with the inside network ports (connected to
the Mediant 8000 ). This configuration ensures the proper Layer 3 switches
activity switchover in case of a switch failure. When the priority is properly set and
both external Layer 3 switches are up, the switch with the higher priority
assigned, functions as the "active switch".
For detailed instructions on the HSRP/VRRP configuration on external Layer 3
switches, see the vendor-specific documentation of the equipment being used.
See 'Appendix - Configuring HSRP/VRRP' on page 889 for an example configuration
of a CISCO Layer 3 switch network.
26.7.3.2 Configuring the Mediant 8000 for the HSRP Protocol
When the Mediant 8000 is connected to the Layer 3 switches clustered via the HSRP
protocol, configure Media ARP Cache Override parameter to Enable GARP in the
Media Gateway board’s Network Settings configuration screen. This setting ensures
that Media Gateway board’s ARP cache is updated only when Gratitious ARP packets
are received and avoids excessive CPU utilization on Media Gateway boards in case
of ES boards or external Layer 3 switches failover.
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