Switching

Hi all,

 

i am not sure if what am trying achieve is possible, i need some  guidance.

We have 3 ex2300 switches in 3 sites , the switches are runnign RSTP.

 

on every site there are 2 Cisco switches forming VSS. from these two cisco switches there are two links connecting to the EX2300 and every VSS is requred to form LAG with the EX2300. 

we have set up the LAG but the AE interface is not coming up. checking the LACT statistics, i can only TX packets and no RX. 

we have tried with and wothout LACP. when LACP is enabled, we tried both ACTIVE/ACTIVE and active/passive  but still AE inteface remains down on the juniper. the port channle interface on the cisco shows up. 

 

configs as below:

# show chassis
aggregated-devices {
    ethernet {
        device-count 2;
    }
}

# show interfaces ae0
aggregated-ether-options {
    lacp {
        active;
    }
}
unit 0 {
  family ethernet-switching {
        interface-mode trunk;
         vlan-members all;
    }
set interfaces xe-0/1/2 ether-options 802.3ad ae0
set interfaces xe-0/1/3 ether-options 802.3ad ae0

set protocols rstp interface ae0.0

 

Regards

Lish

 

 

Are your 10Gb ports configured as virtual chassis uplinks?

 

show virtual-chassis vc-port

Hi Smicker,

 

No. no visrtual setup as of now. is it something i should do ?

 

 

No, but it would prevent the LAG from forming if they were. I don't know if those ports are configured by default for VC as some are on other models. Do you get physical link on xe-0/1/2 and xe-0/1/3?

Hi Smicker,

 

Both physical ports are coming up. these two ports were used as typical L2 trunk ports and were tested to pass traffic. 

'show interfaces ae0 extensive' and 'show lacp interfaces ae0' will give some additional detailed info on any negotiated LACP settings.

Hi Lish,

Can you show us the "show lacp interfaces" on the EX? Are the links on the VSS configured as L2 or L3? Have you tried configuring LACP as Juniper Active, Cisco Passive? and viceversa? What is the periodic interval configured on the Cisco?

Hi, I felt I should update this.
The lag eventually came up after enabling bpdu-filter on the Cisco ports.

STP was shutting down the ports on the Cisco end.

Thanks .