Re: Cross connect between two serial interfaces

Neither am I, but it should work.
Using l2tpv3, you can create a "pseudowire", basically encapsulate all
frames received in one interface and send them elsewhere, where the same
process is done to create a tunnel which is L3 protocol independent,
and L2 protocol transparent.

But I guess nothing limits you from making source and destination in the
same router, so you can L2 connect two interfaces back to back, which
is your requirement if I read it correctly.

Basic idea would be:

l2tp-class R2signal
  hello 10
  password 0 cisco
  cookie size 8

pseudowire-class toR2
  encapsulation l2tpv3
  protocol l2tpv3 R2signal
  ip local interface Loopback2

pseudowire-class toR1
  encapsulation l2tpv3
  protocol l2tpv3 R2signal
  ip local interface Loopback1

interface Loopback1
  ip address 1.1.1.1 255.255.255.255
  no ip directed-broadcast

interface Loopback2
  ip address 2.2.2.2 255.255.255.255
  no ip directed-broadcast

interface serial 0/0
  description to R1
  no ip address
  no cdp enable
  xconnect 1.1.1.1 12 encapsulation l2tpv3 pw-class toR2

interface serial 0/1
  description to R2
  no ip address
  no cdp enable
  xconnect 2.2.2.2 12 encapsulation l2tpv3 pw-class toR1

Search for it @ cisco.com. Sure someone else would have actual
experience. I've used it 2 or 3 times myself.

-Carlos

mohamed kamar @ 19/06/2011 12:48 -0300 dixit:
> Thanks Carlos;
> I'm not very familiar with xconnect, and not sure how it'll solve my
> problem, Can you provide sample configuration
>
>
> > Date: Sun, 19 Jun 2011 12:43:01 -0300
> > From: tron_at_huapi.ba.ar
> > To: mohamed_kamar_at_hotmail.com
> > CC: marcabel_at_gmail.com; ccielab_at_groupstudy.com
> > Subject: Re: Cross connect between two serial interfaces
> >
> > Given that you asked in a studygroup list...
> > what about creating a pseudowire in R3, back to back, and xconnect
> > s0/0 to s0/1 ? Clean, it is sure not.
> > But I guess it will forward the frames :)
> >
> > -Carlos
> >
> > mohamed kamar @ 19/06/2011 12:33 -0300 dixit:
> > > Thanks, So how can this be solved? Or we can say we have technology
> limitation
> > > here and we should stick with PPPoFR solution
> > > > Date: Sun, 19 Jun 2011 10:14:15 -0500
> > >> Subject: Re: Cross connect between two serial interfaces
> > >> From: marcabel_at_gmail.com
> > >> To: mohamed_kamar_at_hotmail.com
> > >> CC: ccielab_at_groupstudy.com
> > >>
> > >> Are you trying to bridge the IP traffic? I don't believe that will
> > >> work. Irb routes the route-able traffic (IP) and bridges the
> > >> unroute-able traffic (IPX, DECNET, etc).
> > >>
> > >> On Sun, Jun 19, 2011 at 10:07 AM, mohamed kamar
> > >> <mohamed_kamar_at_hotmail.com> wrote:
> > >>> Thanks Marc;
> > >>> Is the below enough to make HDLC work or i'm missing something,
> as the
> > >>> below doesn't work :), And R1 not able to ping R2
> > >>>
> > >>> R3#sh run | in bridge
> > >>> bridge irb
> > >>> bridge-group 1<<<<<Under ser 0/0
> > >>> bridge-group 1<<<<<Under ser 0/1
> > >>> bridge 1 protocol ieee
> > >>> bridge 1 route ip
> > >>>
> > >>>> Date: Sun, 19 Jun 2011 10:01:23 -0500
> > >>>> Subject: Re: Cross connect between two serial interfaces
> > >>>> From: marcabel_at_gmail.com
> > >>>> To: mohamed_kamar_at_hotmail.com
> > >>>> CC: ccielab_at_groupstudy.com
> > >>>>
> > >>>> Or if there is no requirement to keep the PPP, then could disable it
> > >>>> and run HDLC. Then you could bridge it.
> > >>>>
> > >>>> On Sun, Jun 19, 2011 at 9:54 AM, mohamed kamar
> > >>>> <mohamed_kamar_at_hotmail.com> wrote:
> > >>>>> Thanks Marc;
> > >>>>> The problem is that the end customer doesn't want to configure
> > >>>>> virtual-template in his ends (R1 and R2), And he needs that all
> > >>>>> configuration to be done in his serial interface as if they are
> > >>>>> back-to-back. Not sure we can do this for him, Or we can say
> the only
> > >>>>> solution is PPPoFR and to use virtual-template in his ends, Thanks
> > > again
> > >>>>>> Date: Sun, 19 Jun 2011 09:33:43 -0500
> > >>>>>> Subject: Re: Cross connect between two serial interfaces
> > >>>>>> From: marcabel_at_gmail.com
> > >>>>>> To: mohamed_kamar_at_hotmail.com
> > >>>>>> CC: ccielab_at_groupstudy.com
> > >>>>>>
> > >>>>>> I was going to say bridging but I believe that requires either
> HDLC
> > > or
> > >>>>>> Frame-relay on the serial links. Could you run back to back frame
> > >>>>>> relay underneath your PPP?
> > >>>>>>
> > >>>>>> On Sun, Jun 19, 2011 at 9:16 AM, mohamed kamar
> > >>>>>> <mohamed_kamar_at_hotmail.com> wrote:
> > >>>>>>> Dear All; My question could be easy but i don't know it's
> answer :)
> > >>>>>>> (R1)S0/0----------S0/0(R3)S0/1-----------S0/0(R2) |
> > >>>>>>> | -------------------------ppp------------------------- How can i
> > >>>>>>> cross
> > >>>>>>> connect in R3 between S0/1 and S0/0 to run PPP between R1 and
> R2 on
> > >>>>>>> its
> > >>>>>>> serial
> > >>>>>>> interfaces directly without involving R3 in any L3 ip
> addressing or
> > >>>>>>> routing
> > >>>>>>> protocol, thanks
> > >>>>>>>
> > >>>>>>>
> > >>>>>>> Blogs and organic groups at http://www.ccie.net
> > >>>>>>>
> > >>>>>>>
> > >>>>>>>
> > > _______________________________________________________________________
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> > >>
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> _______________________________________________________________________
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> > >
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> >
> > --
> > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net