Huawei Quidway S5600 Series Operation Manual page 291

Operation Manual – Routing Protocol
Quidway S5600 Series Ethernet Switches-Release 1510
"logical AND" between destination address and network mask, you can get the
address of the network segment where the destination host or router resides. For
example, if the destination address is 129.102.8.10 and the mask is 255.255.0.0,
the address of the network segment where the destination host or router resides is
129.102.0.0.A mask consists of some consecutive 1s, represented either in dotted
decimal notation or by the number of the consecutive 1s in the mask.
Output interface: It indicates through which interface IP packets should be
forwarded to reach the destination.
Next hop address: It indicates the next router that IP packets will pass through to
reach the destination.
Preference of the route added to the IP routing table: There may be multiple routes
with different next hops to the same destination. These routes may be discovered
by different routing protocols, or be manually configured static routes. The one
with the highest preference (the smallest numerical value) will be selected as the
current optimal route.
According to different destinations, routes fall into the following categories:
Subnet route: The destination is a subnet.
Host route: The destination is a host.
In addition, according to whether the network where the destination resides is directly
connected to the router, routes falls into the following categories:
Direct route: The router is directly connected to the network where the destination
resides.
Indirect route: The router is not directly connected to the network where the
destination resides.
In order to avoid an oversized routing table, you can set a default route. All the packets
for which the router fails to find a matching entry in the routing table will be forwarded
through this default route.
As shown in Figure 1-2, the number in each network cloud indicates the network
address and "R" represents a router. The router R8 is connected to three networks, and
so it has three IP addresses and three physical ports. Its routing table is shown in
Figure 1-2.
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Chapter 1 IP Routing Protocol Overview