Version 6.6 893 October 2014
Installation & Operation Manual B. Appendix - Configuring HSRP/VRRP
B.2.8 Gateway Parameters Provisioning
When the Gateway requests (by ARP packet) the default gateway's MAC address, the
virtual MAC address is received from the default gateway. When the RTP packets are
recieved by the default gateway from the WAN, the private MAC is sent by the default
gateway to the Gateway. Therefore, each time packets are sent and received to and
from the WAN via the defaut gateway, the Gateway ARP table is updated. This update
utilizes CPU resources.
To avoid excessive CPU utilization ,the MediaARPCacheoverride parameter should
be set to 2 (EnableGARP). When this value is set, the Gateway's ARP table is only
updated when the GARP value is recieved. For example, when there is Gateway ES
failover and another router becomes the default gateway.
modify /moGW/moBoard#7 MediaARPCacheoverride=EnableGARP(2)
B.3 Configuring the User Environment (Cisco L3
switch)
This section describes the CLI configuration actions required on the Cisco L3 switch.
B.3.1 IP Address
Set IP Address of Cisco L3 switch to VLAN interface and not to a physical interface.
ip address 10.77.10.3 255.255.255.0
B.3.2 Link Aggregation
In the Cisco CLI, perform the following link aggregation actions:
Set the load distribution method among the ports in the EtherChannel. It’s
recommended to set the method to dst-ip, in case the TP IP address is
consecutively allocated.
port-channel load-balance dst-ip
Note: If you retain the default value of the Cisco (src-mac), this leads to minimal
distribution. Since the L3 switch replaces the source MAC-address (src-mac) of the
packet frame with its MAC-address, the entire traffic will be transferred via only a
single link.
Verify for any IP address, which physical interface will be selected to
communicate packets. To perform this action, specify the following command:
test etherchannel load-balance
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