Siemens S223, S323 user manual Displaying Forwarding Information BaseFIB Table

User Manual	UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5

The following is an example of configuring static route to reach three destinations, which are not directly connected.

SWITCH(config)# ip route 100.1.1.0/24 10.1.1.2

SWITCH(config)# ip route 200.1.1.0/24 20.1.1.2

SWITCH(config)# ip route 172.16.1.0/24 30.1.1.2

To display configured static route, use the following command.

Command	Mode		Description
show ip route {A.B.C.D
A.B.C.D/M bgpㅣconnectedㅣ		Shows configured routing information.
isisㅣkernelㅣospfㅣripㅣstatic	Enable
summary static}	Global
show ip route database static		Shows configured	routing information with IP routing
		table database.

4.3.5Displaying Forwarding Information Base(FIB) Table

The FIB is a table that contains a mirror image of the forwarding information in the IP rout- ing table. When routing or topology changes occur in the network the route processor up- dates the IP routing table and CEF updates the FIB. Because there is a one-to-one corre- lation between FIB entries and routing table entries, the FIB contains all known routes and eliminates the need for route cache maintenance that is associated with switching paths, such as fast switching and optimum switching. FIB is used for making IP destina- tion prefix-based switching decisions and maintaining next-hop address information based on the information in the IP routing table.

The forwarding information base (FIB) table contains information that the forwarding processors require to make IP forwarding decisions.

To display Forwarding Information Base table, use the following command.

Command	Mode	Description
	Enable
show ip route fib	Global	Displays Forwarding Information Base table.
	Bridge

4.3.6Forwarding Information Base(FIB) Retain

Use this command to modify the retain time for stale routes in the Forwarding Information Base (FIB) during NSM restart.

Command	Mode	Description
fib retain		Configures the retain time for FIB during NSM restart
{forever time <1-65535>}	Global	Default: 60sec
no fib retain		Restores is as a default
{forever time <1-65535>}

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