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Knowledge Base

FAQ-What Are the Functions of the NULL0 Route

Publication Date:  2012-07-27  |   Views:  93  |   Downloads:  0  |   Author:  Zhang Wei  |   Document ID:  EKB0000304665

Contents

Issue Description

Q:

What are the functions of the NULL0 route?
      

Alarm Information

Null

Handling Process

A:
1. On the network with dynamic routes and default routes, if the convergence speeds are not synchronous, the temporary loop occurs.
2. Specify a NULL0 for the dynamic route.
For example:
A and B are dynamic routes. When B is not reachable, the packets are forwarded to the upstream routes. If the upstream routes do not aggregate, temporary loops occur between the links. Thus, to solve this problem, you need to specify an exact Null0 route to B, and the priority of the route is lower than that of the dynamic route.
A-----router--------B
                     |
                   |default route

Root Cause

Null

Suggestions

Null