Figure 509: Ospf Virtual Link - Edge-Core ECS4620-28T Quick Start Manual

28/52-port l3 stackable gigabit ethernet switch

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| Unicast Routing

Configuring the Open Shortest Path First Protocol (Version 2)

Figure 509: OSPF Virtual Link

Virtual links can also be used to create a redundant link between any area and the

backbone to help prevent partitioning, or to connect two existing backbone areas

into a common backbone.

Any area disconnected from the backbone must include the transit area ID and the

router ID for a virtual link neighbor that is adjacent to the backbone.

This router supports up five virtual links.

Command Usage

Use the Add page to create a virtual link, and then use the Configure Detailed

Settings page to set the protocol timers and authentication settings for the link.

The parameters to be configured on the Configure Detailed Settings page are

described under

"Configuring OSPF Interfaces" on page

These parameters are displayed:

Process ID – Process ID as configured in the Network Area configuration screen

Transit Area ID – Identifies the transit area for the virtual link. The area ID must

be in the form of an IPv4 address, or also as a four octet unsigned integer

ranging from 0-4294967295.

Neighbor ID – Router ID of the virtual link neighbor. This specifies the Area

Border Router (ABR) at the other end of the virtual link. To create a virtual link, it

must be configured for an ABR at both ends of the link. One of the ABRs must

be next to the isolated area and the transit area at one end of the link, while the

other ABR must be next to the transit area and backbone at the other end of

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