No borrow address for IP protocol troubleshooting

Faults in network applications are always overwhelming. So this time we will explain the IP protocol troubleshooting: The interface does not borrow the address. Let's look at the network structure.

IP protocol troubleshooting: Network Environment

During a test, configure the interface to borrow the IP addresses of other interfaces. The networking diagram is as follows.

Figure IP address borrow case networking Diagram

After configuration, it is found that the route's POS2/0/0 interface cannot borrow the IP address of GE1/0/0.

IP protocol troubleshooting: Fault Analysis

Check whether address borrow is configured for the POS2/0/0 interface. In the interface view, execute the display this command to collect information. The displayed information is as follows.

[RouterA-Pos2/0/0] display this # interface Pos2/0/0 link-protocol pppip address unnumbered interface GigabitEthernet1/0/0 # return check whether the GE1/0/0 interface is configured with an IP address, in the interface view, execute the display this interface command to collect information. The displayed information is as follows.

 
 

  
  
<RouterA-GigabitEtherent1/0/0> display this interfaceGigabitEthernet1/0/0 current state: UP
  
  
Line protocol current state: DOWNDescription: To beijingRoute Port, The Maximum Transmit Unit is 1500 Internet protocol processing: disabled
  
  
IP Sending Frames 'format is PKTFMT_ETHNT_2, Hardware address is 00e0-fc7d-a497
  
  
The Vendor PN is HFBR-5710L
  
  
Port BW: 1G, Transceiver max BW: 1G, Transceiver Mode: MultiMode
  
  
WaveLength: 850nm, Transmission Distance: 550 m
  
  
Loopback: none, full-duplex mode, negotiation: disable, Pause Flowcontrol: Receive
  
  
Enable and Send Enable
  
  
Last physical up time: 2008-08-19 09:08:54
  
  
Last physical down time: 2008-08-19 09:08:38
  
  
Statistics last cleared: never
  
  
Last 300 seconds input rate: 208 bits/sec, 0 packets/sec
  
  
Last 300 seconds output rate: 200 bits/sec, 0 packets/sec
  
  
Input: 218807 bytes, 2299 packets
  
  
Output: 212849 bytes, 2237 packets
  
  
Input:
  
  
Unicast: 1429 packets, Multicast: 867 packets
  
  
Broadcast: 3 packets, JumboOctets: 0 packets
  
  
CRC: 0 packets, Symbol: 0 packets
  
  
Overrun: 0 packets
  
  
InRangeLength: 0 packets
  
  
LongPacket: 0 packets, Jabber: 0 packets, Alignment: 0 packets
  
  
Fragment: 0 packets, Undersized Frame: 0 packets
  
  
RxPause: 0 packets
  
  
Output:
  
  
Unicast: 1430 packets, Multicast: 803 packets
  
  
Broadcast: 4 packets, JumboOctets: 0 packets
  
  
Lost: 0 packets, Overflow: 0 packets, Underrun: 0 packets
  
  
TxPause: 0 packets finds the cause of the problem by displaying the information. The IP address is not configured for the GE1/0/0 interface of route1.
 
 

IP protocol troubleshooting: Procedure

1. Execute the system-view command on route.com to enter the system view.

2. Run interface gigabitethernet 1/0/0 To Go To The GE interface view.

3. Run the command ip address 172.16.10.1 24 to set the ip address.

After performing the preceding operations, you can find that the routerinterface POS2/0/0 can borrow the IP address of the interface GE1/0/0.

IP protocol troubleshooting: Case Summary

When configuring address borrow, first ensure that the borrowed interface has correctly configured the IP address.