Flex Links are much same as RTG (Redundant Trunk Group). It is mostly used when you want to avoid using Spanning Tree and on access switches connecting to two aggregation switches.
See a picture on page http://www.juniper.net/techpubs/en_US/junos12.1/topics/concept/cfm-redundant-trunk-groups-understanding.html
Requirements:
- Juniper EX series switch with Junos 10.4 or later
- Ports configured with family ethernet-switching
Go to configuration mode
cisco >configure terminal "Switch(conf)#
Juniper >configure "user@switch#"
Purpose | IOS | Junos |
disable spanning tree on port | Spanning tree is turned off automatically on flex links | user@host# set protocols rstp interfaces ge-0/0/5 disable user@host# set protocols rstp interfaces ge-0/0/6 disable |
Set Flex Links / RTG | Switch(conf)# interface gigabitethernet0/1 Switch(conf-if)# switchport backup interface gigabitethernet0/2 |
user@host# set ethernet-switching-options redundant-trunk-group group rtg1 interface ge-0/0/5.0 primary user@host# set ethernet-switching-options redundant-trunk-group group rtg1 interface ge-0/0/6.0 |
Configure preemption (optional) | "preemption modes: forced, bandwidth, off. For preempion to work, set forced or bandwidth."
Switch(conf-if)# switchport backup interface gigabitethernet0/2 preemption mode [forced | bandwidth ] Switch(conf-if)# switchport backup interface gigabitethernet0/2 preemption delay 60 |
"Change the length of time (from the default 120 seconds) that a re-enabled primary link waits to take over for an active secondary link." user@host# set redundant-trunk-group group tg1 preempt-cutover-timer 60 |
Show Flex Link/RTG status | Switch(conf-if)# exit Switch(conf)# exit Switch# show interface switchport backup Switch# show interface switchport backup detail |
user@host# run show redundant-trunk-group |
Save configuration / apply and save configuration | Switch# copy running-config startup-config | user@host# commit |
This contribution is also listed in forums.juniper.net - IOS to Junos (I2J) Tips Contest
Flex Links vs RTG
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