Routing table

Introduction

IP routing directs IP packet forwarding on routers. Based on the destination IP address in the packet, a router looks up a route for the packet in a routing table and forwards the packet to the next hop. Routes are path information used to direct IP packets.

A routing information base (RIB) contains global routing information and related information, including route recursion, route redistribution, and route extension information.

Routing protocols, including static and direct routing, each by default have a preference. If they find multiple routes to the same destination, the router selects the route with the highest preference as the optimal route.

The preference of a direct route is always 0 and cannot be changed. You can configure a preference for each static route and each dynamic routing protocol. A smaller preference value indicates a higher priority.

vSystem support information

Support of non-default vSystems for this feature depends on the device model. This feature is available on the Web interface only if it is supported.

Prerequisites

Complete the following tasks before you configure this feature:

• Assign IP addresses to interfaces on the Network > Interface Configuration > Interfaces page.

• Configure routes on the Network > Routing page. Make sure the routes are available.

View routing table information

Routing tables enables the device to determine the forwarding path of a data packet by its destination IP address. After checking routing tables, the device can determine the next-hop device to which the packet should be sent. Routing table information helps you diagnose and address network connectivity issues. You can optimize forwarding paths by analyzing and adjusting route entries.

1. Click the Network tab.

2. In the navigation pane, select Routing > Routing Table.

3. Click the IPv4 Routing Table or IPv6 Routing Table tab, and then view routing table information as needed.

   Figure-1 IPv4 routing table

   

   Figure-2 IPv6 routing table

   

   Table-1 Parameters in the IPv4 or IPv6 routing table

   Parameter	Description
   Destination address	IPv4 or IPv6 destination address of the route.
   Mask length	Mask length for the IPv4 destination address. This parameter is displayed on only the IPv4 Routing Table page.
   Prefix length	Prefix length for the IPv6 destination address. This parameter is displayed on only the IPv6 Routing Table page.
   Protocol	Type of the routing protocol.
   Route metric	Metric value of the route.
   Precedence	Precedence of the route.
   Next hop	Next hop address of the route.
   Output interface	Output interface for the destination network segment.

4. On the IPv4 Routing Table or IPv6 Routing Table tab, click Statistics, and then view route statistics as needed.

   Figure-3 IPv4 route statistics

   

   Figure-4 IPv6 route statistics

   

   Table-2 Parameters on the IPv4 Route Statistics or IPv6 Route Statistics page

   Parameter	Description
   Protocol	Type of the routing protocol.
   Active	Number of active or in-use routes.
   Added	Number of routes that have been added since the router started or the routing table was cleared.
   Deleted	Number of routes that were marked Deleted. This type of routes will be released after a specific period.
   Route count	Total number of routes in the routing table.