From: Lupi, Guy (Guy.Lupi@xxxxxxxxxxxxx)
Date: Sun Apr 21 2002 - 17:48:33 GMT-3
The tunnel just has to be in the same classful network with the same subnet
mask, it doesn't have to match the third octet in your case. You could use
172.16.254.0/25 for the tunnel to get the /25's from r8 to r6, and you can
put a secondary address of 172.16.100.254/24 on serial 1 of r6 to get
172.16.100.0/24 to r8. That should take care of both problems.
~-----Original Message-----
~From: hong tony [mailto:aamercado31@yahoo.com]
~Sent: Sunday, April 21, 2002 4:30 PM
~To: ying chang; ccielab@groupstudy.com
~Subject: Re: FLSM has longer mask than VLSM Probl.
~
~
~Ying
~
~That is one of my dilemnas. I want to stick with the
~80.x subnetwork with the /25 mask and I am already
~using 80.1 and 80.129 so there is no more address to
~use for secondary or tunnels.
~
~
~--- ying chang <ying_c@hotmail.com> wrote:
~> The netmask in flsm has to be the same (see Doyle I
~> pg 205), i.e. you either
~> have to use all /24 or all /25 in your igrp domain.
~> If you don't want to
~> change that, you can add a secondary address or
~> tunnel with /25 netmask to
~> bring the network to ospf. Make sure you either turn
~> off split-horizon or
~> use unicast instead of broadcast if you decide to
~> use the secondary address.
~> Which domain has a longer netmask is non-issue here.
~>
~>
~> >From: hong tony <aamercado31@yahoo.com>
~> >Reply-To: hong tony <aamercado31@yahoo.com>
~> >To: ccielab@groupstudy.com
~> >Subject: FLSM has longer mask than VLSM Probl.
~> >Date: Sun, 21 Apr 2002 12:06:33 -0700 (PDT)
~> >
~> >HI
~> >
~> >I search the archives and can't find an answer for
~> >this one.
~> >
~> >\lo0
~> >r8----r6-----r3
~> >/lo1
~> >
~> >r8/r6 is IGRP with r6 as the redistributing router
~> for
~> >the OSPF on r6/r13
~> >
~> >r8 ip address:
~> >lo0 = 172.16.80.1/25
~> >lo1 = 172.16.80.129/25
~> >s0= 172.16.86.8/24
~> >
~> >r6 ip address:
~> >s0 = 172.16.86.6/24
~> >s1 = 172.16.100.6/27
~> >
~> >r3 ip address:
~> >s1 = 172.16.100.3/27
~> >
~> >My question is - How can I can the 172.16.80.0
~> network
~> >into r6 routing table?
~> >
~> >If I put "ip route 172.16.80.0 255.255.255.0 null0"
~> >the route would propagate to r6/r3. However,
~> obviously
~> >I do not want to do statics...so here were my
~> >alternative attempts.
~> >
~> >1. default-network - Can't do it cuz of the
~> classful
~> >nature of this command which would propagate a
~> static
~> >route into r8.
~> >
~> >2. Summarizing - Nope cuz the IGRP (FLSM) has a
~> longer
~> >mask than OSPF (VLSM)
~> >
~> >3. secondary address - Because of the
~> 172.16.80.x/25
~> >mask is using up all the subnetworks for 80.x, I
~> don't
~> >have any other address to use for secondary
~> >
~> >4. tunnelling - same problem as #3
~> >
~> >5. policy routing - I can't see this as applicable
~> >
~> >Is this possible or am I stuck to the null 0
~> option.
~> >
~> >Thanks
~> >
~> >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:58:15 GMT-3