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After a Static Route Is Configured on an NE40E V300R006, an inloopback Route Is Generated

Publication Date:  2019-04-16 Views:  22 Downloads:  0
Issue Description

Version information: V300R006C01SPC003

Configuration:

 ip route-static 9.164.47.59 255.255.255.255 33.164.48.131 description To:RenHangMQ

Symptom:

After a static route is configured on an NE40E V300R006, two routes are generated as follows:

9.164.47.59/32  Static 60   0        RD    33.164.48.131   InLoopBack0
                Static 60   0        RD    33.164.48.131   Serial1/2/0/7:0

The ping operation on the peer IP address 9.164.47.59 shows that no packets are lost. However, after the Telnet operation is performed on the service interface of the NE40E, intermittent service interruptions occur.

Handling Process

1. Check that the ping operation on the next-hop address 33.164.48.131 is successful.

2. Check the interface IP address.

interface Serial1/2/0/7:0
 link-protocol ppp
 description To:RenHangGuoKu
 ip address 33.164.48.130 255.255.255.252

Because of a 30-bit mask, the IP address 33.164.48.131 is calculated as a broadcast address.

The broadcast address cannot be configured on the peer device. Therefore, the mask configured on the local device is incorrect (The mask of the peer device cannot be viewed because the peer device cannot be logged in to).

After the 30-bit mask is changed to a 24-bit mask, the communication becomes normal and the inloopback route is not displayed.

Solution

After the 30-bit mask is changed to a 24-bit mask, the communication becomes normal and the inloopback route is not displayed.

interface Serial1/2/0/7:0
 ip address 33.164.48.130 255.255.255.0

[HuaWeiNE40B] DIS IP routing-table

9.164.47.59/32  Static 60   0        RD    33.164.48.131   Serial1/2/0/7:0

The inloopback route is not displayed.

Suggestions

Carefully check the IP address and mask during configuration of IP addresses and routes on a device. Do not configure the host address to a network address or a broadcast address during configuration of the next-hop address for a static route.

END