Routing table information, Dynamic routing protocols – H3C Technologies H3C WX3000E Series Wireless Switches User Manual
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Each entry in the FIB table specifies a physical interface that packets destined for a certain address
should go out to reach the next hop—the next router—or the directly connected destination.
NOTE:
For more information about the FIB table, see the
Layer 3—IP Services Configuration Guide.
Routing table information
Display the brief information of a routing table by using the display ip routing-table command.
For example:
Routing Tables: Public
Destinations : 7 Routes : 7
Destination/Mask Proto Pre Cost NextHop Interface
1.1.1.0/24 Direct 0 0 1.1.1.1 GE1/0/1
2.2.2.0/24 Static 60 0 12.2.2.2 GE1/0/2
…(Part of the output information is omitted)
A route entry includes the following key items:
•
Destination—Destination IP address or destination network
•
Mask—The network mask specifies, in company with the destination address, the address of the
destination network. A logical AND operation between the destination address and the network
mask yields the address of the destination network. For example, if the destination address is
129.102.8.10 and the mask 255.255.0.0, the address of the destination network is 129.102.0.0. A
network mask is made up of a certain number of consecutive 1s. It can be expressed in dotted
decimal format or by the number of the 1s.
•
Pre—Preference of the route. Among routes to the same destination, the one with the highest
preference is optimal.
•
Cost—When multiple routes to a destination have the same preference, the one with the smallest
cost becomes the optimal route.
•
NextHop—Specifies the IP address of the next hop
•
Interface—Specifies the interface through which a matching IP packet is to be forwarded
Dynamic routing protocols
Based on dynamic routing protocols, dynamic routing can detect network topology changes and
recalculate the routes, so it is suitable for large networks. However, dynamic routing is difficult to
configure. It not only imposes higher requirements on the system, but also consumes a certain amount of
network resources.
Dynamic routing protocols can be classified based on different criteria, as shown in
:
- H3C WX5500E Series Access Controllers H3C WX3500E Series Access Controllers H3C WX2500E Series Access Controllers H3C WX6000 Series Access Controllers H3C WX5000 Series Access Controllers H3C LSWM1WCM10 Access Controller Module H3C LSUM3WCMD0 Access Controller Module H3C LSUM1WCME0 Access Controller Module H3C LSWM1WCM20 Access Controller Module H3C LSQM1WCMB0 Access Controller Module H3C LSRM1WCM2A1 Access Controller Module H3C LSBM1WCM2A0 Access Controller Module H3C WA3600 Series Access Points H3C WA2600 Series WLAN Access Points