Routing

Hi all,

Note: Boxes are MX80

In JUNOS how can we scale the number of units on physical interfaces and whole box above 255 VRRP groups?

Or is there a way we can use the same VRRP group number on all units on a physical interface and the whole box as long as one uses different VLAN and whereas the layer 2 switches connected supports MAC-Address tables for each individual VLAN.

Or what do you advise to only reuse VRRP id-s on different physical interfaces?.

Will highly appreciate if someone can give me a small example configuration with gigether interfaces and best practise.

Thank you,

/Rameez.

Acording to RFC there are 255 groups per Broadcast domain ie Vlan. 

In your case you can have the same VRRP group as long as they are in different Vlans. MX80 is not limited to 255 groups...

Thank you Dumitru for the response. You mentioned that MX80 is not limited to 255 groups. Please correct me if I am wrong so meaning that I can configure more than 255 VRRP groups per broadcast domain on an MX80?

Regards,

/Rameez. 

No, you can't configure more than 255 VRRP groups per broadcast domain(vlan), it's  a protocol scalability limitation, it's according to RFC. The reason is that only 8 bits of the standardized MAC address are used to derive VRRP group.

Per system if you have mutiple VLANs you can of course have more VRRP groups.

I haven't seen a topology that required this amount of VRRP groups per Vlan...

Thankyou for the explanation Dumitru.

Regards,

/Rameez.