Name: Cisco Catalyst 2960-XR
Brand: Cisco
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The following figure displays DNS-based SSM mapping.

Figure 6: DNS-Based SSM Mapping

The SSM mapping mechanism that enables the last hop router to join multiple sources for a group can provide

source redundancy for a TV broadcast. In this context, the last hop router provides redundancy using SSM

mapping to simultaneously join two video sources for the same TV channel. However, to prevent the last hop

router from duplicating the video traffic, the video sources must use a server-side switchover mechanism.

One video source is active, and the other backup video source is passive. The passive source waits until an

active source failure is detected before sending the video traffic for the TV channel. Thus, the server-side

switchover mechanism ensures that only one of the servers is actively sending video traffic for the TV channel.

To look up one or more source addresses for a group that includes G1, G2, G3, and G4, you must configure

these DNS records on the DNS server:

G4.G3.G2.G1 [multicast-domain] [timeout] IN A source-address-1

IN A source-address-2

IN A source-address-n

See your DNS server documentation for more information about configuring DNS resource records.

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