Table of Contents
Advertisement
Chapter 26
Administering the Switch
Console> (enable) show arp
ARP Aging time = 300 sec
+ - Permanent Arp Entries
* - Static Arp Entries
+ 10.1.1.1
* 20.1.1.1
Console> (enable)
Configuring Static Routes
For information on configuring a default gateway (default route), see the
Note
Gateways" section on page
In some situations, you might need to add a static routing table entry for one or more destination
networks. Static route entries consist of the destination IP network address, the IP address of the
next-hop router, and the metric (hop count) for the route.
In software release 5.1 and later releases, you can configure Classless InterDomain Routing (CIDR)
routes, such as IP supernets, in the switch IP routing table. You can specify the subnet mask for a
destination network using the number of subnet bits or using the subnet mask in dotted decimal format.
If no subnet mask is specified, the default (classful) mask is used.
The switch uses the longest-match network address in the IP routing table to determine which gateway
to use to forward IP traffic. In releases prior to software release 5.1, the switch always uses the classful
subnet mask for IP routing table entries.
The switch forwards IP traffic generated by the switch using the longest address match in the IP routing
table. The switch does not use the IP routing table to forward traffic from connected devices, only to
forward IP traffic generated by the switch itself (for example, Telnet, TFTP, and ping).
In software releases prior to software release 5.1, the classful subnet mask is always used (you cannot
specify the subnet mask for the destination network).
To configure a static route, perform this task in privileged mode:
Task
Step 1
Configure a static route to the remote network.
Step 2
Verify that the static route appears correctly in the
IP routing table.
This example shows how to configure a static route on the switch and how to verify that the route is
configured properly in the routing table:
Console> (enable) set ip route 172.16.16.0/20 172.20.52.127
Route added.
Console> (enable) show ip route
Fragmentation
-------------
enabled
The primary gateway: 172.20.52.121
Destination
---------------
78-12647-02
3-7.
Redirect
Unreachable
--------
-----------
enabled
enabled
Gateway
---------------
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
at 00-80-1c-93-80-60 on vlan 1
at 00-80-1c-93-80-40 on vlan 1
Command
set ip route destination[/netmask] gateway
[metric]
show ip route
RouteMask
Flags
Use
----------
-----
--------
Configuring Static Routes
"Configuring Default
Interface
---------
26-9
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
