What is Redundant Trunk Group (RTG) ?

--> Redundant Trunk Group (RTG) is a feature used on the Juniper EX Series switches as a replacement for STP.

--> Redundant Trunk Group (RTG) provides a loop-free Layer 2 topology without requiring Spanning Tree to be running on the access-layer switches.

--> Redundant Trunk Group (RTG) works by making one interface as active and the other interface as standby.

--> Redundant Trunk Group (RTG) enabled interfaces do not send/forward BPDUs and discard BPDUs if received on RTG-enabled interfaces.

--> A maximum of only two links can be configured in an RTG group and Up to 16 RTG groups are supported for the EX Series switches.

--> One Interface Will be acting as an active interface and forwarding data traffic while the other interface remains in standby mode.

--> By default, the highest numbered interface in an RTG group is the active interface to forward the traffic.

--> We can manually make one interface as primary interface in RTG group by using the command.

--> If primary interface goes down then secondary interface starts forwarding the data traffic in RTG Group.

--> In order RTG to work, STP need to be disabled on RTG enabled interfaces.

--> Juniper recommends keeping STP enabled for other ports that are not enabled for RTG to prevent Layer 2 loop.

Configuration:

Kareem@switch# set ethernet-switching-options redundant-trunk-group RTG_Group1 interface ge-0/1/0.0
Kareem@switch# set ethernet-switching-options redundant-trunk-group RTG_Group1 interface ge-0/1/1.0

Ref: Juniper

Md.Kareemoddin