Re: show interface doesnt tell you the mac address of the interface
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You may not see the key-word "mac-address" under 'show interface" output on Junos devices.
MAC addres is specified under "Current address" and "Hardware address"
Now why current address and hardware address.
Hardware address is the actual MAC for the physical interface and current address is a virtual MAC thats used in SRX clusters, this is different from the physical MAC
SRX cluster nodes use the Virtual MAC for communication , so for troubleshooting purpose you need to use the Current address as SRX MAC address.
How is Current address calculated - The virtual MAC assigned is based on cluster and interface ID. So if you have 2 SRX cluster with same cluster id (say 1)and both of them have reth0 configured, they both will have same Virtual MAC address . Recommendation is to keep different cluster ID on your network (at least when they are on same L2 domain)