From: Teck PhrEAk!! (phreakinphunk@hotmail.com)
Date: Tue Mar 25 2003 - 10:31:23 GMT-3
Hi Madisa,
interesting traffic is whatever u define in the dialer-list.Its the traffic
that u want the ISDN link to fire for.....OSPF considers ISDN as
point-to-point network type.....hence the hello and dead is 10 and 40 sec
respectively......now u dont want the ISND link to come up for revery OSPF
hello's.....Demand Circuit just supresses the hello's thats it! it sets the
Do Not Age bit in the LSA's while transmitting them out......so effectively
the LSA's never time-out on the other side.But any interesting traffic will
still fire the ISDN.......but not the OSPF Hello's.
Also note for some reason ISDN idle-timeout doesnt apply for ospf packets
hence the link comes up for the hello transmission and goes down...hence
seems to flap.Anyone....correct me on this note if i am wrong.
cheers,
Sumit.
ccie#11125
ccdp,ccnp,rhce,mcse,scsa,ibm e-biz.
>From: "Madisa Ramagoffu (MM)" <ramagmm1@telkom.co.za>
>Reply-To: "Madisa Ramagoffu (MM)" <ramagmm1@telkom.co.za>
>To: <ccielab@groupstudy.com>
>Subject: RE: IP OSPF demain circuit
>Date: Tue, 25 Mar 2003 12:17:20 +0200
>
>Hi
>
>I have tried in the lab a couple of times to configure ospf demand
>circuit
>with the thinking that the isdn will go down if there is no
>interesting traffic but it just stays up
>I thought maybe it must stay up & not transfere any data , but ospf
>update during topology change goes through
>
>I am i right to assume the above or the interface must physically go
>down when there is no intresting traffic
>also what is interesting traffic in this case ??? is ospf updates also
>considered interesting also???
>
>Thanx
>madisa
>
>
>
>
>
>-----Original Message-----
>From: Teck PhrEAk!! [mailto:phreakinphunk@hotmail.com]
>Sent: 25 March 2003 11:01
>To: PhongTT2@FPT.COM.VN; ciscolab@vip.sina.com; ccielab@groupstudy.com
>Subject: RE: IP OSPF demain circuit
>
>
>hey Phong,
>
>that defeats the purpose for which hes using the "OSPF Demand Circuit"
>.....backup.....in yr solution the isdn will never come up.....even if
>there
>is a change in the backbone area.
>
>The purpose of "demand circuit" is NOT "backup"...but to keep isdn
>down when
>running ospf on it .....so that isdn is used only by interesting
>traffic.
>
>for backup use "watch-list" or "backup interfaces".
>
>
>cheers,
>
>sumit p ahuja
>ccie#11125
>ccdp,ccnp,rhce,scsa,mcse,ibm e-biz pro.
>
>
>
>
>
>
> >From: "Phong Tran Tien" <PhongTT2@FPT.COM.VN>
> >Reply-To: "Phong Tran Tien" <PhongTT2@FPT.COM.VN>
> >To: "Ciscolab" <ciscolab@vip.sina.com>, <ccielab@groupstudy.com>
> >Subject: RE: IP OSPF demain circuit
> >Date: Tue, 25 Mar 2003 14:12:12 +0700
> >
> >if you put the ISDN in area 0, then you have no ways to keep it down
>when
> >there is a change in your topology. The only way is that you put ISDN
>in
> >totally stub area with the command "area xxx stub no-summary". Then
>changes
> >in your topology will not affect the totally stub area and the ISDN
>will
> >not up.
> >
> >HTH
> >CCIE #11285
> >
> > -----Original Message-----
> > From: Ciscolab [mailto:ciscolab@vip.sina.com]
> > Sent: Tue 3/25/2003 12:00 AM
> > To: ccielab@groupstudy.com
> > Cc:
> > Subject: IP OSPF demain circuit
> >
> >
> >
> > Hello, All,
> >
> > I have a working enviroment which is consist of several ospf
>areas, I
> >backup DDN link with isdn ( ip ospf demand-circuit ) in area 0, how
>can I
> >keep the ISDN down when there is a route change in the non-backbone
>area?
> >
> > !!!!!!!!!!!!!!!!Ciscolab
> > !!!!!!!!!!!!!!!!ciscolab@vip.sina.com
> > !!!!!!!!!!!!!!!!!!!!2003-03-25
>
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