Cisco Systems IGX 8400 manual Adding an IGX Feeder

Universal Switching Module Enhanced

IMA characteristics are as follows:

•All physical ports of an IMA trunk use the same line configuration.

•The node maintains a set of retained links for the IMA trunk to keep it active. The IMA trunk does not fail unless the number of active trunks is less than the user-specified number of retained links.

•The IMA trunk can provide a clock source or clock path (see cnftrk command). The first (the lowest numbered) available physical line is used. If this line fails, the next available line within the IMA provides the clock source or clock path.

•Full support for individual physical line alarms and statistics.

To specify the range of ports for an IMA trunk, you can use either Cisco WAN Manager or the command-line interface (CLI). To define an IMA trunk on the CLI, use the uptrk command:

uptrk slot.start_port-end_port

For example, you could enter uptrk 8.1–4. Subsequently, you would refer to this logical trunk by using only the slot number and first port number—8.1 in this example—when you use other commands, such as addtrk, deltrk, cnftrk, and so on. Commands for viewing IMA information also include dspportstats, dspphyslns, dsptrkcnf, dspfdr, dspnode, and dspphyslnstathist.

Adding an IGX Feeder

The IMA feeder node feature provides redundancy in case one of the physical lines on an IMA trunk fails. This reduces the chance of a single point of failure when a single feeder trunk is out of service. In addition, this feature allows you to configure the services on a feeder node instead of a routing node.

Figure 4-5shows an example of an IGX feeder topology.

Figure 4-5 Sample IGX Feeder Topology

IGX-feeder

U	U
	X

FM-

M E

IGX-hub

U	U
X	X
M-	M-
E	E

IMA-trunk 8.3-8

IMA cloud

IGX-hub

U	U
X	X
M-	M-
E	E

29454

Currently supported on the IGX, a Service Expansion Shelf (SES) can function as a feeder node connected to an IGX routing node using a UXM-E OC-3 interface. The UXM-E feeder node feature adds the capability to support the UXM-E interface and the IGX as a feeder node. The routing node can be an IGX or a BPX/BXM-T3, BPX/BXM-E3, or BNI. The UXM-E interface type T1/E1, nxT1/E1, T3/E3, and OC-3, SMF/MMF Extra Long Reach can be used to connect an IGX feeder node to the IGX/BPX routing node.

Note For a summary of commands you use to bring up an IGX node, refer to the section “IGX Configuration Summary” in Cisco IGX 8400 Series Installation and Configuration .

Trunk Cards 4-15