Nortel SMC 2450, Руководство по внедрению

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Page 52 of 260 Description
553-3001-225 Standard 1.00 May 2006
Requirements and recommendations
No special configuration is required on the SMC to support campus
redundancy; however, additional system-wide configuration changes are
required to deploy the SMC system into the campus redundant environment:
• To avoid potential routing problems, IP addresses from the same subnet
must be assigned to the SMCs connected to the two different TLAN
switches. This requirement complies with the CS 1000 requirement
when configuring a Campus Redundant IP telephony network.
• The Virtual Router IP address configured for the SMC HA TLAN
interface must be the default gateway for all the signaling servers.
Without SMC, the default gateway for these devices is the upper
interface IP address of the router to the intranet.
• To route packets properly to the CS 1000 devices, the router must use the
Virtual Router IP address of the SMC intranet interface as the gateway
IP address.
• The SMS, as a router, can impact IP address assignments for devices on
both sides of the SMC. Note that this is also true for SMC integration into
non-campus redundant configurations.
Other considerations
For SMC Release 1.0, a SMC failover causes ungraceful failover, meaning
that registered IP phones reconnect using the backup SMC.
Geographic redundancy
Geographic redundancy is a CS 1000 failover architecture, consisting of a
primary and secondary CS 1000. Each CS 1000 is identically configured and
synchronized through the WAN.
In geographic redundancy, an SMC installation must be present at each
CS 1000 site so the traffic, after it fails over from one location to another,
continues to be protected by an SMC.
Both SMC clusters must be managed independently for configuration
changes and software updates.