[j-nsp] IRB Interface Question

[Chuck Anderson]

It appears to be settable:

{master}[edit interfaces irb unit 10]
mx# set bandwidth ?
Possible completions:
  <bandwidth>          Logical unit bandwidth (informational only)

After setting to 10g, it changes:

  Logical interface irb.10 (Index 36) (SNMP ifIndex 70) (Generation 15)
    Flags: SNMP-Traps 0x0 Encapsulation: ENET2
    Bandwidth: 10000mbps

And indeed it appears to change the OSPF metric too, compare the
default metric of irb.10 10.0.10.0 with that of irb.20 10.0.20.0:

Router  *10.0.0.1      10.215.0.1      0x800014b3   153  0x22 0x1932 1296
  bits 0x2, link count 106
  id 10.0.10.0, data 255.255.255.0, Type Stub (3)
    Topology count: 0, Default metric: 10
  id 10.0.20.0, data 255.255.255.0, Type Stub (3)
    Topology count: 0, Default metric: 100

On Tue, Sep 06, 2011 at 05:22:49PM -0700, quinn snyder wrote:
> isnt the bandwidth used as a metric placeholder for $routing_protocol?
>  this is the significance in vendor 'c' land.
> 
> q.
> 
> -= sent via iphone. please excuse spelling, grammar, and brevity =-
> 
> On Sep 6, 2011, at 17:15, "Scott T. Cameron" <routehero at gmail.com> wrote:
> 
> > IRB is like RVI on Cisco.  It's a logical interface, and doesn't have a
> > physical (bandwidth) limitation.
> >
> > I don't use NMS so can't speak on what you're seeing.  But I have 2x 1Gbps
> > interfaces in LACP (ae1) bound to an IRB & 1x 10Gb.  show int irb ext shows
> > only 1000 Mbps, but I think that's just a placeholder instead of having
> > different show interface output.
> >
> > Scott
> >
> > On Tue, Sep 6, 2011 at 7:59 PM, Paul Stewart <paul at paulstewart.org> wrote:
> >
> >> Hi there...
> >>
> >> Been searching for an answer on this - can't find it.
> >>
> >> On an MX box we have an IRB interface that is physically made up of 4X1GE
> >> interfaces.  I noticed our NMS platform reports the IRB interface itself as
> >> 1000mbps and also the CLI reports the same:
> >>
> >> Logical interface irb.911 (Index 97) (SNMP ifIndex 384)
> >>
> >>   Description: xxxxxxxxx
> >>
> >>   Flags: SNMP-Traps 0x4004000 Encapsulation: ENET2
> >>
> >>   Bandwidth: 1000mbps
> >>
> >>   Routing Instance: xxxxxx Bridging Domain: xxxxxxx
> >>
> >> I presume that the IRB has no actual bandwidth limitation and that the only
> >> limitation is the physical interfaces?  Can I set the bandwidth manually or
> >> is this because the IRB has no real way to know what the bandwidth behind
> >> it
> >> is possible of doing?