Data Center

Hi guys,

I am starting to learn MC-LAG for my certification. I began with simplest  case of Active-Standby mode.

Please consider the following set up:

Above:

SW1 is a layer2 switch with vlan 10.  SW1 has  aeo ( lacp) with QFX2 and QFX3.  SW1 ae0 is an access port vlan v10.

QFX2 and QFX3 are layer 2 switches, using MC-lag ae0 with vlan 10. QFX2 is standby and QFX3 is Active .

ICCP is run between 1.1.1.2 and 1.1.1.3 as shown above.

ISSUE:

Server-9 ( 10.10.10.9) wants to talk to server-7 which is behind QFX2 ( which is currently stand by), I see ARP for server7 arrives at QFX3 ( Active SW)  but it does not get pass through to QFX2 ( stand by) which is connected to server-7.

Is this supported topology for active stand by case?  Or do I have to introduce   layer 2 link between QFX2 and QFX3 carrying V10?

Much appreciated!!

Additional info;

QFX2config:

set interfaces ae0 aggregated-ether-options lacp active
set interfaces ae0 aggregated-ether-options lacp system-id 00:00:00:00:00:01
set interfaces ae0 aggregated-ether-options lacp admin-key 1
set interfaces ae0 aggregated-ether-options mc-ae mc-ae-id 1
set interfaces ae0 aggregated-ether-options mc-ae redundancy-group 1
set interfaces ae0 aggregated-ether-options mc-ae chassis-id 0
set interfaces ae0 aggregated-ether-options mc-ae mode active-standby
set interfaces ae0 aggregated-ether-options mc-ae status-control active
set interfaces ae0 unit 0 family ethernet-switching vlan members v10
set switch-options service-id 1 
set interfaces xe-0/0/0 ether-options 802.3ad ae0

set protocols iccp local-ip-addr 1.1.1.2
set protocols iccp peer 1.1.1.3 redundancy-group-id-list 1
set protocols iccp peer 1.1.1.3 liveness-detection minimum-interval 300
set protocols iccp peer 1.1.1.3 liveness-detection multiplier 3

QFX3:

set interfaces ae0 aggregated-ether-options lacp active
set interfaces ae0 aggregated-ether-options lacp system-id 00:00:00:00:00:01
set interfaces ae0 aggregated-ether-options lacp admin-key 1
set interfaces ae0 aggregated-ether-options mc-ae mc-ae-id 1
set interfaces ae0 aggregated-ether-options mc-ae redundancy-group 1
set interfaces ae0 aggregated-ether-options mc-ae chassis-id 1
set interfaces ae0 aggregated-ether-options mc-ae mode active-standby
set interfaces ae0 aggregated-ether-options mc-ae status-control standby
set interfaces ae0 unit 0 family ethernet-switching vlan members v10
set protocols iccp local-ip-addr 1.1.1.3
set protocols iccp peer 1.1.1.2 redundancy-group-id-list 1
set protocols iccp peer 1.1.1.2 liveness-detection minimum-interval 3
set protocols iccp peer 1.1.1.2 liveness-detection multiplier 3       
set switch-options service-id 1

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Be kind!!
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Hi Leebahi,

You should have multi-chassis-protection enabled on particular interface on both QFX2 and QFX3 (on the link between QFX2 and QFX3 where ICCP should be established)

" set multi-chassis multi-chassis-protection <ip_address> interface <interface_name>"

Here is a configuration example, please check if your config is similar. You will see multi-chassis-protection command there as well.

https://www.juniper.net/documentation/en_US/release-independent/nce/topics/example/multichassis-link-aggregation-qfx-series.html

If issue still persist, after configuring above command, then share the output for

• show iccp detail

Regards,

Vikas Dhawan