Information Technology Reference
In-Depth Information
Enter the command necessary to install the route in the routing table.
Step 3.
If you are not sure what the correct command is, review the section “Configuring and
Verifying Interfaces Exercise,” earlier in this chapter.
After you enter the correct command, you should see debug output. Your output might be
slightly different from the following example:
is_up: 1 state: 4 sub state: 1 line: 1 has_route: False
RT: add 172.16.3.0/24 via 0.0.0.0, connected metric [0/0]
RT: NET-RED 172.16.3.0/24
RT: NET-RED queued, Queue size 1
RT: interface FastEthernet0/0 added to routing table
%LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
is_up: 1 state: 4 sub state: 1 line: 1 has_route: True
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, chan
ged state to up
is_up: 1 state: 4 sub state: 1 line: 1 has_route: True
is_up: 1 state: 4 sub state: 1 line: 1 has_route: True
The new network you configured on the LAN interface is now added to the routing table,
as shown in the highlighted output.
If you do not see the route added to the routing table, the interface did not come up. Use
the following systematic process to troubleshoot your connection:
Check your physical connections to the LAN interface.
1.
Is the correct interface attached?
yes
Your router might have more than one LAN interface. Did you connect the correct
LAN interface?
yes
An interface will not come up unless it detects a carrier detect signal at the physical
layer from another device. Is the interface connected to another device such as a hub,
switch, or PC?
yes
Check link lights. Are all link lights blinking?
yes
2.
Check the cabling. Are the correct cables connected to the devices?
yes
3.
Has the interface been activated or enabled?
yes
4.
If you can answer
yes
to all the proceeding questions, the interface should come up.
Enter the command to verify that the new route is now in the routing table.
Step 4.
Your output should look similar to the following output. There should now be one route in
the table for R1. What command did you use?
R1#
show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
