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6 forwarding information base(fib) retain, Displaying forwarding information base(fib) table, Forwarding information base(fib) retain – Siemens S223 User Manual

Page 59

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

A50010-Y3-C150-2-7619 59

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

| bgpconnected

isiskernelospfripstatic

|

summary

| static}

Shows configured routing information.

show ip route database

static

Enable

Global

Shows configured routing information with IP routing
table database.

4.3.5 Displaying

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

show ip route fib

Enable

Global
Bridge

Displays Forwarding Information Base table.

4.3.6

Forwarding 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

{forever | time <1-65535>}

Configures the retain time for FIB during NSM restart
Default: 60sec

no fib retain

{forever | time <1-65535>}

Global

Restores is as a default

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