From: Chris Hugo (chrishugo@yahoo.com)
Date: Thu Sep 19 2002 - 22:30:12 GMT-3
Thank You Omer.
chris hugo
Omer Ansari wrote:Chris,
the answer lies in your statement:
> is pull the cable out of the switch and the backup interface kicks in.
the idea being that the ethernet line protocol does not go down if it
stays connected to the switch, even if the other router on the ethernet
has his interface shut down.
this is b/c the switch is still providing the keepalives necessary to keep
this interface up/up.
ofcourse as Prakash said earlier, if your routers are back to back, the
line protocol would indeed go down (if u havent disabled keepalives) and
backup int would work just fine.
HTH
On Thu, 19 Sep 2002, Chris Hugo wrote:
>
> So why do I need to use the tunnel. I'm curious :) thanx, chris hugo
> Peng Zheng wrote: Thanks. It's very clear.
>
> --- Omer Ansari wrote:
> > OK here goes:
> > replace R2 and R3 with R6 and R5:
> >
> > R6's e0: 137.20.64.6
> > R5's e0ip: 137.20.64.5
> >
> > R6#sir con | inc Ether
> > C 137.20.64.0/20 is directly connected,
> > Ethernet0/0
> >
> > taking an example of a route learnt from R5:
> >
> > R6#sir ospf | inc 200
> > O IA 200.200.200.0/24 [110/792] via 137.20.64.5,
> > 00:01:10, Ethernet0/0
> >
> > R6(config)#int tu55
> > R6(config-if)#tunn
> > *Mar 2 09:58:58.489: %LINEPROTO-5-UPDOWN: Line
> > protocol on Interface
> > Tunnel55, changed state to down
> > R6(config-if)#tunnel dest 200.200.200.1
> > R6(config-if)#tunnel source 137.20.64.6
> > R6(config-if)#
> > *Mar 2 10:00:06.493: %LINEPROTO-5-UPDOWN: Line
> > protocol on Interface
> > Tunnel55, changed state to up
> >
> > R6(config-if)#backup interface bri0/0
> >
> > thus on R6:
> > BRI0/0 137.20.224.6 YES
> > manual standby mode
> > down
> > ..
> > Tunnel55 unassigned YES unset
> > up up
> >
> > now lets shut down R5's e0 interface:
> >
> > R5(config)#int e0/0
> > R5(config-if)#shut
> >
> > on R6:
> > R6#
> > *Mar 2 10:06:35.502: %OSPF-5-ADJCHG: Process 10,
> > Nbr 137.20.5.5 on
> > Ethernet0/0 from FULL to DOWN, Neighbor Down: Dead
> > timer expired
> > R6#
> >
> > b/c of which the 200.200.100/24 route is lost,
> > because of which the tunnel
> > goes down:
> >
> > R6#
> > *Mar 2 10:06:58.544: %LINEPROTO-5-UPDOWN: Line
> > protocol on Interface
> > Tunnel55, changed state to down
> >
> > because of which backup interface kicks up:
> >
> > *Mar 2 10:06:58.548: %LINK-3-UPDOWN: Interface
> > BRI0/0:1, changed state to
> > down
> > *Mar 2 10:06:58.552: %LINK-3-UPDOWN: Interface
> > BRI0/0:2, changed state to
> > down
> > *Mar 2 10:06:58.600: %LINK-3-UPDOWN: Interface
> > BRI0/0, changed state to
> > up
> >
> >
> >
> > Omer
> >
> > On Wed, 18 Sep 2002, Peng Zheng wrote:
> >
> > > COuld you please give me a example?
> > >
> > > --- Omer Ansari wrote:
> > > > Peng,
> > > >
> > > > allow me correct myself. the tunnel would have a
> > > > destination pointing to a
> > > > route learnt via R3, not on the e0 address on
> > R3.
> > > > [perhaps you could
> > > > monitor the R1-R3 network]
> > > >
> > > > when the route vanishes from r2's routing table,
> > the
> > > > tunnel would go down.
> > > >
> > > > the speed with which this would happen will be
> > > > directly proportional to
> > > > the convergence speed of the RP in question.
> > > >
> > > > Omer
> > > >
> > > > On Wed, 18 Sep 2002, Omer Ansari wrote:
> > > >
> > > > > Create a tunnel interface on R2 with R3's e0
> > ip
> > > > address as destination
> > > > > (and r2's e0 as source)
> > > > >
> > > > > then run backup interface br0/0 on the tunnel
> > If.
> > > > >
> > > > > the tunnel would go down when R3's e0 would go
> > > > down, triggering your
> > > > > backup interface.
> > > > >
> > > > > a wizard called Carlos Mendioroz came up with
> > this
> > > > some time ago so i
> > > > > cannot take the accolade.
> > > > >
> > > > > Omer
> > > > >
> > > > > On Wed, 18 Sep 2002, Peng Zheng wrote:
> > > > >
> > > > > > Actually, they are connected through switch.
> > > > Then,
> > > > > > what's the solution?
> > > > > >
> > > > > > --- Prakash H Somani
> >
>
> > > > wrote:
> > > > > > > Hi,
> > > > > > >
> > > > > > > I think I can agree with you partially. R2
> > > > will dial
> > > > > > > i.e BRI will
> > > > > > > come in spoofing mode from standby if R3
> > e0
> > > > goes
> > > > > > > down only if
> > > > > > > those two routers are directly connected.
> > If
> > > > those
> > > > > > > are connected
> > > > > > > through switch...then it will not work....
> > > > > > >
> > > > > > > Regards....Prakash
> > > > > > >
> > > > > > > On Wed, 18 Sep 2002 Peng Zheng wrote :
> > > > > > > >Hi,
> > > > > > > >
> > > > > > > >R1(bri 0)-----(bri 0)R2(e0)---(e0)R3
> > > > > > > > (e1)|________________________|(e1)
> > > > > > > >
> > > > > > > >IGRP is run on all three routers.
> > > > > > > >
> > > > > > > >Requirement:
> > > > > > > >
> > > > > > > >1) R2 only dials R1 when the e0 to R3 is
> > > > > > > disconnected.
> > > > > > > >2) Snapshot and dialer watch can not be
> > used.
> > > > > > > >
> > > > > > > >
> > > > > > > >I think I should use backup interface
> > under
> > > > e0 of
> > > > > > > R2.
> > > > > > > >
> > > > > > > >Is it right?
> > > > > > > >
> > > > > > > >If so, How should I configure the
> > > > dialer-list?
> > > > > > > >
> > > > > > > >And because two numbers are used. R2 need
> > to
> > > > dial
> > > > > > > >second if it can not connect to R1.
> > > > > > > >
> > > > > > > >if:
> > > > > > > >
> > > > > > > >dialer map ip 1.1.1.1 name r1 broadcast
> > > > number1
> > > > > > > >dialer map ip 1.1.1.1 name r1 broadcast
> > > > number2
> > > > > > > >
> > > > > > > >is OK?
> > > > > > > >
> > > > > > > >
> > > > > > > >Thank you for help.
> > > > > > > >
> > > > > > > >Best Wishes,
> > > > > > > >Peng Zheng
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > >
> > >__________________________________________________
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>
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