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Link Redundancy on S5720

Latest reply: Aug 13, 2018 06:07:41 903 2 0 0 0
Hi team,

I´m working on a network topology that will have ring topology using OSPF for Routing Protocol. We are using Huawei S5720 L3 Switches

We are going to have two redundant path:

1.- Microwaves, connected to GigabitEther 0/0/1 and 0/0/2 on each switch
2.- Fiber Optic, connected to XGigabitEthernet 0/0/1 and 0/0/2 on each switch

The primary link will be #1 (Microwaves)
The secondary link (or back up) will be #2 (Fiber Optic)

What we want to do is to have all the traffic on both GBE 0/0/1 and 0/0/2, and if it happens that one of them goes down, the F.O 0/0/1 or 0/0/2 goes up and start moving traffic.

We were trying to set up priorities using STP, but traffic flows on all interfaces, it seems we can´t control or set up which interfaces should be like the master one and which ones should be the back up.

Any ideas?


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Created Aug 12, 2018 16:12:55

Hello Julianmrios,

Did you try to manipulate ospf cost on your interfaces?
By default cost is the same so there will be loadbalancing.
OSPF cost calculation uses bandwidth-reference which by default equals 100 Mbs this means that interfaces of 100Mbs, 1000Mbs and 10000Mbs will have cost of 1.

The following commands will do the trick for you:
<HUAWEI> system-view
[HUAWEI] ospf 1
[HUAWEI-ospf-1] bandwidth-reference 10000

<Huawei> system-view
[Huawei] interface Xgigabitethernet 1/0/0
[Huawei-XGigabitEthernet1/0/0] ospf cost 100
This post was last edited by Argentym at 2018-08-12 21:39.
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Created Aug 13, 2018 06:07:41

You may also set the cost statically on each interface or manipulate the delay as it is not advisable to change the bandwidth which will affect other routing protocols if any. keeping in mind that ospf support ECMP.
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