The icp.config file defines ICP peers (parent and sibling caches).

IMPORTANT: After you modify the icp.config file, navigate to the Traffic Server bin directory and run the traffic_line -x command to apply the changes. When you apply the changes to a node in a cluster, Traffic Server automatically applies the changes to all other nodes in the cluster.

Format

Each line in the icp.config file contains the name and configuration information for a single ICP peer in the following format:

host : host_IP : peer_type : proxy_port : icp_port : MC_on : MC_IP : MC_TTL :

Each field is described in the following list.

host

The hostname of the ICP peer.

This field is optional; if you do not specify the hostname of the ICP peer, you must specify the IP address.

host_IP

The IP address of the ICP peer.

This field is optional; if you do not specify the IP address of the ICP peer, you must specify the hostname.

ctype

Use the following options:

• 1 to indicate an ICP parent cache
• 2 to indicate an ICP sibling cache

proxy_port

The port number of the TCP port used by the ICP peer for proxy communication.

icp_port

The port number of the UDP port used by the ICP peer for ICP communication.

Examples

The following example configuration is for three nodes: the local host, one parent, and one sibling.

localhost:0.0.0.0:3:8080:3130:0:0.0.0.0:1
host1:123.12.1.23:1:8080:3131:0:0.0.0.0:1
host2:123.12.1.24:2:8080:3131:0:0.0.0.0:1