[j-nsp] IRB MAC Address Question

[Ben Dale]

Hi Paul

> I'm trying to figure out what MAC address an IRB assumes?  In this case
> IRB.61 interface....
> 

I haven't got an MX handy, but on the EX, IRBs take MAC addresses from the same pool that physical interfaces use:

root at ex3200-uptown> show ethernet-switching table  
Ethernet-switching table: 1 entries, 0 learned
  VLAN              MAC address       Type         Age Interfaces
  client            00:26:88:72:23:40 Static         - Router

root at ex3200-uptown> show interfaces ge-0/0/0 | match Hardware   
  Interface flags: Hardware-Down SNMP-Traps Internal: 0x0
  Current address: 00:26:88:72:23:40, Hardware address: 00:26:88:72:23:40

In the above output, my client VLAN doesn't have ge-0/0/0 as a member.  It is annoying that the irb interface (or vlan.x interface on the EX) doesn't report the MAC like a normal L3 interface would.


>  Logical interface irb.61 (Index 84) (SNMP ifIndex 187)
> 
>    Flags: SNMP-Traps 0x4004000 Encapsulation: ENET2
> 
>    Bandwidth: 10000mbps
> 
>    Routing Instance: default-switch Bridging Domain: vlan-61+61
> 
>    Input packets : 32942
> 
>    Output packets: 938
> 
>    Protocol inet, MTU: 1500
> 
>      Addresses, Flags: Is-Preferred Is-Primary
> 
>        Destination: xx.xx.xx/24, Local: xx.xx.xx.34, Broadcast:
> xx.xx.xx.255
> 
>    Protocol inet6, MTU: 1500
> 
>      Flags: Is-Primary
> 
>      Addresses, Flags: Is-Default Is-Preferred Is-Primary
> 
>        Destination: xxxx:xxx:xxx::/64, Local: xxxx:xxx:xxx::34
> 
>      Addresses, Flags: Is-Preferred
> 
>        Destination: fe80::/64, Local: fe80::222:83ff:fe07:7ff0
> 
>    Protocol multiservice, MTU: 1500