Two-Way Active Measurement Protocol on ACX Series
The Two-Way Active Measurement Protocol (TWAMP) defines a standard for measuring IP performance between two devices in a network. You can configure TWAMP on ACX Series routers. ACX Series routers support only the reflector side of TWAMP.
For more information about TWAMP, see RFC 5357, A Two-Way Active Measurement Protocol (TWAMP).
To configure TWAMP properties, include the twamp statement
at the [edit services rpm] hierarchy level:
[edit services rpm]
twamp {
server {
authentication-mode mode;
client-list list-name {
[ address address ];
authentication none];
}
max-connection-duration hours;
maximum-connections count;
maximum-connections-per-client count;
maximum-sessions count;
maximum-sessions-per-connection count;
port udp-port-number;
server-inactivity-timeout minutes;
}
}
You can specify a number of TWAMP server properties, some of
which are optional, by including the server statement at
the [edit services rpm twamp] hierarchy level:
[edit services rpm twamp]
server {
client-list list-name {
[ address address ];
}
authentication-mode mode;
maximum-connections count;
maximum-connections-per-client count;
maximum-sessions count;
maximum-sessions-per-connection count;
port udp-port-number;
}
To specify the list of allowed control client hosts that can connect to this server, include the
client-liststatement at the[edit services rpm twamp server]hierarchy level. Each value you include must be a Classless Interdomain Routing (CIDR) address (IP address plus mask) that represents a network of allowed hosts. You can include multiple client lists, each of which can contain a maximum of 64 entries. You must configure at least one client address to enable TWAMP.ACX Series routers do not support authentication and encryption modes. The value for
authentication-modestatement at the[edit services rpm twamp server]hierarchy level must be set tonone.To specify the maximum number of concurrent connections the server can have to client hosts, include the
maximum-connectionsstatement at the[edit services rpm twamp server]hierarchy level. The allowed range of values is 1 through 2048 and the default value is 64. You can also limit the number of connections the server can make to a particular client host by including themaximum-connections-per-clientstatement. ACX Series routers supports a maximum of 15 concurrent connections.To specify the maximum number of sessions the server can have running at one time, include the
maximum-sessionsstatement at the[edit services rpm twamp server]hierarchy level. The allowed range of values is 1 through 2048 and the default value is 64. You can also limit the number of sessions the server can have on a single connection by including themaximum-sessions-per-connectionstatement. ACX Series routers supports a maximum of 15 sessions.To specify the TWAMP server listening port, include the
portstatement at the[edit services rpm twamp server]hierarchy level. The range is 1 through 65,535. If a port range is not specified, then the default port 862 is used.TWAMP control connection traffic always arrives on ACX routers with the listening port set as 862. Because this port number for traffic probes can be modified, probes that arrive with a different port number are not recognized and processed by ACX routers correctly. As a result, TWAMP traffic and host-bound packets are dropped in such a scenario.