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why does the interface jo...

why does the interface join into the eth-trunk on S5720 not as expected?

Created: Apr 8, 2019 01:17:50Latest reply: Apr 8, 2019 08:20:11 309 6 0 0
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I have two S5720 switch, and they connect to each other through a eth-trunk, to make sure the eth-trunk keeps working when few physical links donw, so I add more physical links than needed, in other words, there are physical redundancy. for example, I added four links and only two of them are in used, the rest are standby, but there are problems, the choosen interfaces are not expected one, though I configured lacp priority under the interface view. below is the configuration. when finished the configuration, I expect interface g0/0/3 and g0/0/4 as the main using, and g0/0/1, g0/0/2 are standby, but on the contrary, g0/0/1 and g0/0/2 are the main using, and g0/0/3, g0/0/4 are standby. what's the problem?


#

interface Eth-Trunk1

 port link-type trunk

 port trunk allow-pass vlan 2 to 100

 mode lacp-static

 max active-linknumber 2

#

interface GigabitEthernet0/0/1

 eth-trunk 1

#

interface GigabitEthernet0/0/2

 eth-trunk 1

#

interface GigabitEthernet0/0/3

 eth-trunk 1

lacp priority 100

#

interface GigabitEthernet0/0/4

 eth-trunk 1

 lacp priority 100

#


s5720eth-trunk
  • x
  • convention：

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chenhui
Admin Created Apr 8, 2019 08:13:52 Helpful(0) Helpful(0)

Posted by sim_157 at 2019-04-08 06:40does that have any effects?

Yes, it really does affect the result. Because the LACP preempt is disabled by default, when the LACP preempt is disabled and all the active interfaces are working fine, the interface wouldn't be chosen as the active one although it has a lower priority. You can enable the LACP preempt under the Eth-Trunk interface view by using the command lacp preempt enable.
  • x
  • convention：
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chenhui
chenhui Admin Created Apr 8, 2019 01:57:21 Helpful(0) Helpful(0)

which interfaces are added into the eth-trunk first?
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sim_157
sim_157 Created Apr 8, 2019 06:40:28 Helpful(0) Helpful(0)

Posted by chenhui at 2019-04-08 01:57 which interfaces are added into the eth-trunk first?
does that have any effects?
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  • convention：
WheatGrass
WheatGrass Created Apr 8, 2019 06:44:31 Helpful(0) Helpful(0)

By default, the priority of an E-Trunk is 100. So, all the priority now are the same. A smaller value indicates a higher priority.

You can refer to this link:

https://support.huawei.com/hedex/pages/EDOC1000177841AEG11278/08/EDOC1000177841AEG11278/08/resources/dc/priority_e-trunk_view.html?ft=0&fe=10&hib=13.1.6.2.60&id=priority_e-trunk_view&text=priority%20(E-Trunk%20view)&docid=EDOC1000177841
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sim_157
sim_157 Created Apr 8, 2019 08:08:35 Helpful(0) Helpful(0)

Posted by WheatGrass at 2019-04-08 06:44 By default, the priority of an E-Trunk is 100. So, all the priority now are the same. A smaller val ...
I didn't configure e-trunk. I mean why the interface g0/0/3 and g0/0/4 are not choosen as the active interface, because I set these two interfaces priority lower than interface g0/0/1 and g0/0/2
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  • convention：
chenhui
chenhui Admin Created Apr 8, 2019 08:13:52 Helpful(0) Helpful(0)

Posted by sim_157 at 2019-04-08 06:40does that have any effects?

Yes, it really does affect the result. Because the LACP preempt is disabled by default, when the LACP preempt is disabled and all the active interfaces are working fine, the interface wouldn't be chosen as the active one although it has a lower priority. You can enable the LACP preempt under the Eth-Trunk interface view by using the command lacp preempt enable.
  • x
  • convention：
sim_157
sim_157 Created Apr 8, 2019 08:20:11 Helpful(0) Helpful(0)

Posted by chenhui at 2019-04-08 08:13 yes, it do really effect the result. because the lacp preempt is disabled by default, when lacp pr ...
OK, I'll try it
  • x
  • convention：
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