Hi,
This is from "EIGRP Network Design Solutions" by Ivan Pepelnjak, p.296
----------------------------------------------------------------------------
------------------------
NOTE: Using point-to-point subinterfaces in networks where the core router
has several neighbors can also lead to Interface Descriptor Block(IDB) limit
problems; most routers can support only up to 300 physical and logical
interfaces when running Cisco IOS prior to version 12.0. The IDB limit is
platform-dependent in IOS 11.1CA and IOS 12.0 and has been raised for the
high-end routers like 7x00 series routers or AS5800 access servers.
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------------------------
Hope this helps,
And my router(11.2 enterprise) doesn't accept "sh idb". What IOS version
does support it?
Jaeheon Yoo
----- Original Message -----
From: "Katson PN Yeung" <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
To: <[EMAIL PROTECTED]>
Sent: Saturday, January 06, 2001 2:15 AM
Subject: Re: How to check IDB?
>
> Thanks Chris.
>
> Your information is very useful.
>
> Another question is, how can I know the IDB number for each IOS version?
Any
> place I can find such info?
>
> Many thanks to you.
>
>
>
> "Chris McCoy" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> >
> > There's an undocumented command for showing the IDBs:
> >
> > [---Snip from Phrack 56---]
> >
> > @sh idb
> >
> > This command shows the hardware and software interface
> > databases.
> > this is cisco's way of keeping track of how many
> > interfaces are present
> > on the system.. includes hardware and software
> > interfaces (physical,
> > subinterfaces etc). there is a software limit of 1024
> > i believe in
> > ios 11 and 2048 in ios 12. this is a global limit for
> > the router.
> >
> > output:
> >
> > ctalkb#sh idb
> >
> > 19 SW IDBs allocated (2296 bytes each)
> >
> > 9 HW IDBs allocated (4008 bytes each)
> > HWIDB#1 1 FastEthernet0/0 (Ether)
> > HWIDB#2 2 Serial2/0:0 (Serial)
> > HWIDB#3 3 Ethernet3/0 (Ether)
> > HWIDB#4 4 Ethernet3/1 (Ether)
> > HWIDB#5 5 Ethernet3/2 (Ether)
> > HWIDB#6 6 Ethernet3/3 (Ether)
> > HWIDB#7 7 Serial4/0 (Serial)
> > HWIDB#8 8 Serial5/0 (Serial)
> > HWIDB#9 9 Loopback0
> >
> > Have fun...
> >
> > Chris M.
> >
> > --- Katson PN Yeung <[EMAIL PROTECTED]> wrote:
> > > Dear all,
> > >
> > > When reading Caslow's book, there is a term called
> > > IDB (Interface Descriptor
> > > Block). It specifies the max number of interface the
> > > router can have.
> > >
> > > Anyone knows which IOS command can check the IDB
> > > number of a router?
> > >
> > > Thanks.
> > >
> > >
> > > _________________________________
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