[j-nsp] IRB MAC Address Question

[Paul Stewart]

Hi folks... this is resolved (IRB MAC Address Question & IRB Configuration
Question).

A helpful person confirmed offline that my IRB configuration was indeed
correct.  We traced it back to upstream MAC filtering where the output of
"show interface irb" showed the correct MAC address... (thanks again for
some offline help).

Paul



-----Original Message-----
From: Ben Dale [mailto:bdale at comlinx.com.au] 
Sent: May-18-10 9:22 PM
To: Paul Stewart
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] IRB MAC Address Question

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