Got it

CE7855 outgoing interface static route packet loss

Latest reply: Dec 24, 2018 01:33:40 570 1 0 0 0

Issue Description

Customer complaining that after inserting a /32 static route only with outgoing interface and without specifying the next-hop, packet loss occur. 

Handling Process

Requested from customer the following output: 

<Huawei> display diagnostic-information

transparent.gif Solution


interface 40GE1/0/6:4

 undo portswitch

 ip address 172.X.38.22

 device transceiver 40GBASE-COPPER

Customer configuration was before like this :

[ac-2-1] ip route-static 172.X.38.18 40GE1/0/6:4

After configuring the static route in this way problem was solved:

[ac-2-1] ip route-static 172.X.38.18 40GE1/0/6:4 172.X.38.18  

[ac-2-1] ip route-static 172.X.38.18 172.X.38.18  

If we do not configure next-hop for a static route with a multi-access outgoing interface like Ethernet, it will be considered an incomplete route


If the next-hop is not specified in the static route, the next-hop in FIB it will be the interface’s address as the next-hop, in our case 172.X.38.22, which is not a valid next-hop or forwarding path.

When the packet is received for that destination it will be sent to CPU for further processing, because the route it matches does not have a next-hop and because Ethernet it’s a multi-access network segment, so it can’t rewrite the packet because it is missing Layer 2 information for the next-hop.  

Next-hop is required to be configured on multi-access interfaces like Ethernet in this case for the CE to be able to rewrite the packets at Layer 2 correctly.

So, missing the 'next-hop' in your configuration caused unexpected behavior on the CE so from here is also the packet loss.

  • x
  • convention:

Created Dec 24, 2018 01:33:40

Learn more, great
View more
  • x
  • convention:


You need to log in to comment to the post Login | Register

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " User Agreement."

My Followers

Login and enjoy all the member benefits


Are you sure to block this user?
Users on your blacklist cannot comment on your post,cannot mention you, cannot send you private messages.
Please bind your phone number to obtain invitation bonus.