Inter Chassis Link (ICL)– ICL is used to forward data traffic across the MC-LAG peers.
So for this topology BFD failure detection will be 60×3 =180 ms) This multiplier will be used along with liveness-detection minimum-interval to detect failure if ICCP peer, default value is 3. BFD session timer to detect failure of MC-LAG peer ( 60 ms is used in this topology)
redundancy-group-id-list- it must be same on both MC-LAG peers and will be used in MC-ae configuration.
session-establishment-hold-time- 50 seconds is recommended vlaue for faster ICCP connection establishment among MC-LAG peers.
ICCP Peer- IP adress configured on peer MC-LAG member that will be used to estblish ICCP session with local MC-LAG device.(lo0 address is recommended to be used for ICCP peer establishment).
(lo0 address is recommended to be used for ICCP peer establishment)
Local-IP-Address– IP adress configured on lcoal MC-LAG member that will be used to estblish ICCP session with MC-LAG peer device.
ICCP messages exchange MC-LAG configuration parameters and ensure that both peers use the correct LACP parameters. Because ICCP uses TCP/IP to communicate between the peers, the two peers must be connected to each other. It uses TCP as a transport protocol and requires Bidirectional Forwarding Detection (BFD) for fast convergence. ICCP replicates control traffic and forwarding states across the MC-LAG peers and communicates the operational state of the MC-LAG members. The MC-LAG peers use the Inter-Chassis Control Protocol (ICCP) to exchange control information and coordinate with each other to ensure that data traffic is forwarded properly. Important concepts for MC-LAG proper configuration / functionality are as under:. MC-LAG (Active-Active) is correct solution to above described problem as it offers 2 active REs in 2 different devices/ chassis. This scenario can cause momentary disruption of services. In case of failure of primary Routing Engine (RE) the backup RE will take over and all PFEs now, needs to connect to new primary RE. The real problem is that one RE is active at one time and all PFEs must be connected with active RE.
Lag switch mac how to#
In my earlier blog (Junos High Availability Design Guide) it was discussed how to make use of redundant routing engines by configuring features like (GRES, NSR, NSB) for reduction of downtime to minimum possible level.