# Configuring the Analyzer Device

The analyzer device must be configured to receive the mirrored traffic from the E Series router’s analyzer interface. You can use the default keyword with the interface command to configure an interface as the virtual router’s default analyzer interface; it is then used when an analyzer interface is not explicitly specified in the ip mirror command. You cannot configure multiaccess interfaces, such as IP over Ethernet, as default analyzer interfaces.

You can configure any type of IP interface on the E Series router as an analyzer interface, except for special interfaces such as SRP interfaces, null interfaces, and loopback interfaces. An interface cannot be both an analyzer interface and a mirrored interface at the same time. A single analyzer interface can serve multiple mirrored sessions. Analyzer interfaces drop all nonmirrored traffic.

You can configure IP or GRE analyzer interfaces to enable traffic to flow between tunnel endpoints that are local to the router. The tunnel can be located on a shared tunnel server port or line module. For a complete list of the line modules and I/O modules available for ERX14xx models, ERX7xx models, and the ERX310 Broadband Services Router, see ERX Module Guide. For more information about line modules and IOAs available with the E120 and E320 Broadband Services Routers, see E120 and E320 Module Guide.

Shared tunnel server on the ES2 10G ADV LM supports GRE tunnels for tunneling the mirrored data packets. The mirrored data is forwarded to the analyzer device using the GRE analyzer interface. Use the ip analyzer command to configure the GRE tunnel interface to act as as a GRE analyzer tunnel interface. The ES2 10G ADV LM does not support non-analyzer tunnel interfaces. Also, when you configure a GRE interface for checksum calculations, use of sequence numbers, session keys, and other optional parameters, the ES2 10G ADV LM does not support those GRE interfaces. However, if you have configured a non-analyzer tunnel interface or a GRE interface with optional parameters, these interfaces remain non-operational. The GRE analyzer interface forwards mirrored traffic and drops all non-mirrored traffic.

Also, placement of GRE tunnels on the supported locations is no longer synchronous with the tunnel configuration. So, you can configure tunnel servers when the chassis does not support the required resources such as shared tunnel server ports or tunnel server modules. However, the tunnels configured are non-operational. The tunnels become operational when the required resources are added to the chassis.

| Note: If a chassis has shared or dedicated tunnel server on the ES2 4G LM and shared tunnel server on the ES2 10G ADV LM, the GRE non-analyzer tunnel interfaces are available on the ES2 4G LM. Only GRE analyzer interfaces with no optional configurations are available on the ES2 10G ADV LM shared tunnel server.

Policies are not supported on analyzer interfaces. When you configure an analyzer interface, existing policies are disabled, and no new policies are accepted.