Friday , November 24 2017
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Tag Archives: Huawei routers

RIP loop protection

I am going to show you how RIP loop protection works. Let’s take the topology from the previous post to demonstrate the features.

RIP topology

There are 2 methods of loop protection: Split Horizon and Poison Reverse.

Split Horizon

It prohibits a router to advertise a route back to neighbors, through the interface that receives the routes. Split Horizon is enabled by default on Huawei routers:

[R1]display rip 1 interface Serial 0/0/0 verbose
Serial0/0/0(192.168.20.1)
State : UP MTU : 500
Metricin : 0
Metricout : 1
Input : Enabled Output : Enabled
Protocol : RIPv2 Multicast
Send version : RIPv2 Multicast Packets
Receive version : RIPv2 Multicast and Broadcast Packets
Poison-reverse : Disabled

Authentication type : None
Replay Protection : Disabled

Split Horizon is disabled

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cheat sheet – ACL applications

Our blog topics touched access lists ACLs, used on Huawei devices. We talked about ACLs in traffic policies, ACLs and their matching order, ACLs in PBR and so on and so forth.

As ACLs are widely used, I decided to prepare a simple cheat sheet, that describes three kinds of ACLs (the most often used) and their usage scenarios.

Additionally a new page has been opened. I will upload new cheat sheets there, when they are ready.

Have a suggestion for a cheat sheet? Create your own? Let us know in comments.

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