Preferred and Directed Routes

Chapter 5 NMT Execute Commands

AutoRoute Least Cost Routing

Table 5-1 Least Cost Routing Configuration

Topic	Required Settings	Comments

Specifying a Least	Sites table	Any site can have a least cost or
Cost Route	RA (Routing Algorithm) field: Enter C (least cost) or CD (least cost	least hops routing rule.
		least hops routing rule.
	with delay as a cost)

	Links table	The weight of the trunk to be
	Cost field: Enter a value between 1 and 50.	used in the routing algorithm.

	Voice, Data, and Bursty Traffic tables	The maximum allowable cost of
	Cost field: Enter a value between 1 and 100.	the route for this connection.

NMT allows you to provide any connection with a path through the network, called a preferred route. If the preferred route is available, NMT will follow it for that connection. If the preferred route is not available (common during Failure Analysis), NMT routes the connection any way it can. NMT also models a directed route - a special case of a preferred route in which a connection must take its preferred route, or not be routed at all.

To create a preferred route, enter a route in the Preferred_Route field in the Traffic tables. The route is a series of cross-connects (Xcon), separated by equal signs (=), i.e, Xcon1[=Xcon2]...[=XconN].

A cross-connect consists of an optional In-trunk PortID (slot/port identifier) followed by a forward slash (/), a mandatory Site Name, and an optional forward slash followed by an Out-trunk PortID. That is, you represent a cross-connect as: [In-trunkPortID/]SiteName[/Out-trunkPortID].

When you specify either of the PortID’s in an Xcon, you specify a unique trunk. If NMT has a choice of trunks between two nodes, specify the one NMT should use. You do not have to specify each Xcon to the same level of detail; one may have no PortID, the next both PortID, etc.

For a connection from Denver to Paris, the following are all valid preferred routes.

Paris

3.1/Paris

Denver=Paris

Denver/4.1=Paris

Denver/4.1=3.1/Paris

Denver=Paris

4.1/Denver=Paris

4.1/Denver=4.1/Paris

4.1/Denver/3.1=4.1/Paris

Denver/3.1=4.1/Boston/3.1=4.1/Paris

Note NMT provides help entering preferred routes. When you press the Help key while in the preferred route field, NMT shows all the valid trunks between nodes. Select the one you want by pressing Return. When you press the Help key again, NMT shows all the valid trunks to other nodes. A suggestion: first, model your network without preferred routes. Then open the map. Now go back to configure your connections for preferred routes. You will be able to see which trunk to pick based on the map.

See Table 5-1for more information on modeling preferred and directed routes.

	Cisco WAN Modeling Tools Guide
5-2	OL-10426-01, Rev. A0

OL-10426-01 specifications

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Cisco Systems OL-10426-01 manual Preferred and Directed Routes, Any site can have a least cost or

Models: OL-10426-01

Table 5-1 Least Cost Routing Configuration

Any site can have a least cost or

The weight of the trunk to be

The maximum allowable cost of

Preferred and Directed Routes

OL-10426-01, Rev. A0

OL-10426-01 specifications