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Adding One-Hop Tunnels

Using the one-hop tunnel feature, users can create a pair of one-hop tunnels for each link, one for each direction. These tunnels are created with an explicit route that force them to use the direct link.

The following commands are the corresponding Cisco commands for creating one-hop tunnels:

Note:

The one-hop tunnel feature should only be used for networks where an IGP is deployed on the interfaces for which a one-hop tunnel will be created.

Select Network > Elements > Tunnels. Click on the Tunnel tab in the Network Info table. Click Add... and add a user parameter to store the Tunnel Group ID, such as TunnelGroupID.

Figure 1: Adding a User Parameter for TunnelGroupID. Software interface for adding user parameters to tunnels with active Tunnel tab. Dialog prompts Enter the parameter with TunnelIDGroup in text field and OK and Cancel buttons below. Main window has Add, Modify, Delete, Close, and Help buttons at the bottom and up and down arrows on the right.

Select Modify > Selected > User Parameters... and select the tunnel user parameter that was just created. Then click Add... to enter in a group name and ID range. The One Hop Tunnels you create will be given the group name as prefix and a number in the ID range as suffix.

Figure 2: Adding a Tunnel ID Group Software interface for configuring Tunnel ID Groups with a checked option to always check tunnel IDs. The main window has empty columns for Group Name, Min ID, and Max ID, with Add and Modify buttons. A popup window shows a new tunnel group named MyOneHopTunnel with an ID range from 1 to 100, and OK and Cancel buttons.

Note that you can only add one-hop tunnels for links that have an IGP enabled. To enable an IGP protocol, modify the links through Network > Elements > Links... and click the Modify button. In the Protocols tab turn on either OSPF or ISIS and click OK.

Figure 3: Enabling OSPF or ISIS on the Links Network configuration interface for modifying 18 links with tabs for Properties, Location, Multicast, MPLS/TE, and Protocols. The Protocols tab displays options for configuring routing protocols like MPLS, OSPF, ISIS1, ISIS2, EIGRP, IGRP, RIP, LDP, TDP, and SRP. Features include setting metrics and toggling protocol features with dropdown menus and text fields. Buttons for OK, Cancel, and Help are available.

Select Network > Elements > Tunnels, Add > One Hop Tunnels... Select some links by filtering for them. An easy way is to highlight them on the map and then click Filter from Map. Select the Tunnel ID Group to use to create the one hop tunnels and add a tunnel bandwidth. Click “OK” to add the one hop tunnels.

Figure 4: Add One Hop Tunnels Add One Hop Tunnels window of a network tool showing options to filter and select links, set tunnel bandwidth, and confirm or cancel configuration.

Select Modify > Elements > Tunnels to view the newly added one hop tunnels. Several nodes can have tunnels with the same TunnelID but different tunnels originating from a node should have unique tunnelIDs.

Figure 5: Results of One Hop Tunnel Additions Table detailing network tunnels with columns for ID, NodeA ID, NodeZ ID, BW, Type, Pri, Pre, Current Route, Configured, Comment, and Secondary.

Note the explicit path given in the Configured column of the following table. Double-click on a newly added one-hop tunnel to view the configured route. Then select the User Parameters tab. The tunnel user parameter for Tunnel ID Group is specified here.

To generate configlets for these one hop tunnels, switch to Tunnel mode Design > Configlets/Delta > LSP Configlet... Click Submit in the resulting window. The configlet includes in the description line the interface name used for the first hop of the tunnel.