Amt Tunnel And Traffic Types; Out Of Resource Mode; Enabling Amt - Cisco CRS Series Configuration Manual

AMT Tunnel and Traffic Types

7 After validation the Relay establishes the AMT Tunnel and starts sending multicast traffic [Type 6]. Any
further (S,G) uses the same Request/Query/Update - three-way handshake because the tunnel is already
established.
The AMT Protocol Stack
The elements of the AMT protocol stack are:
Payload
UDP Header
IP Header
AMT Tunnel and Traffic Types
The multicast traffic carried in the AMT tunnel may be IPv4 or IPv6. The AMT tunnel may be setup with
IPv4 or IPv6 endpoints. This provides us four possibilities.
• v4-in-v4: IPv4 multicast traffic carried over an IPv4 tunnel
• v6-in-v4: IPv6 multicast traffic carried over an IPv4 tunnel
• v6-in-v6: IPv6 multicast traffic carried over an IPv6 tunnel
• v4-in-v6: IPv4 multicast traffic carried over an IPv6 tunnel
Currently, support is available only for the first two options; namely, IPv4-in-IPv4 and IPv6-in-IPv4.

Out of Resource mode

An important aspect of AMT tunnels is the Out of Resource mode (OOR).
You can monitor a relay based on the number of gateways, the total number of gateways across all routes, or
on the number of routes per gateway.
If any of these limits are hit, the relay goes into the OOR mode. During this time, the relay withdraws the
anycast prefix. The default method to come out of the OOR mode, is the automatic method, where the relay
comes back to normal after reaching 80% of the maximum value.

Enabling AMT

This tasks outlines the procedure for enabling AMT.
SUMMARY STEPS
1. configure
2. router amt
3. commit
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
196
Implementing Automatic Multicast Routing:
AMT Header