Information Technology Reference
In-Depth Information
Serial0/0/1
unassigned
YES unset
administratively down
down
Serial0/1/0
209.165.201.2 YES manual
up
up
Serial0/1/1
unassigned
YES manual
administratively down
down
Vlan1
unassigned
YES manual
administratively down
down
The following partial output is from the show running-config command. It also shows the current
configuration of this interface. When the interface is disabled, this command displays shutdown under
the interface; however, when the interface is enabled, no shutdown is not displayed:
<output omitted>
interface FastEthernet0/0
ip address 172.16.0.1 255.255.255.0
<output omitted>
As explained in Chapter 1, each interface must belong to a separate subnet/network .
Next, configure the Serial 0/0/0 and Serial 0/0/1 interface on router HQ. The process to configure a
serial interface is similar to the process to configure a Fast Ethernet interface. For the data communi-
cations equipment (DCE) side on the WAN link, you need to add the clock rate command. HQ will
provide signaling to B1 and B2 at 64,000 kbps:
HQ(config)# interface serial 0/0/0
HQ(config-if)# ip address 10.0.0.1 255.255.255.252
HQ(config-if)# clock rate 64000
HQ(config-if)# no shutdown
%LINK-3-UPDOWN: Interface Serial0/0/0, changed state to down
HQ(config)# interface serial 0/0/1
HQ(config-if)# ip address 10.0.0.5 255.255.255.252
HQ(config-if)# clock rate 64000
HQ(config-if)# no shutdown
%LINK-3-UPDOWN: Interface Serial0/0/1, changed state to down
You can display the current state of Serial 0/0/0 using the show interfaces serial 0/0/0 command:
HQ# show interfaces serial 0/0/0
Serial0/0/1 is down, line protocol is down
Hardware is GT96K Serial
Internet address is 10.0.0.5/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
<output omitted>
Why is the link still down?
The link is down because we have not yet configured and enabled the other end of the serial link.
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