RE: ATM-AToM

As Tyson says the customer should take care of load balancing the traffic.
Signaling will tear down the far end circuit when the local circuit goes
down. But, in order to guarantee that the two L2 circuits do not traverse
the same core interfaces you may want to look at TE for the PE to PE path.
Then you can put the primary over one path and the secondary over a second
to guarantee no intermediate loss terminates both circuits. Since both
circuits are connected to the same PE it appears, you are primarily
protecting the last mile.

David

--
http://dcp.dcptech.com
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Tyson Scott
> Sent: Thursday, January 13, 2011 12:13 PM
> To: 'Mohamed Osama'; dcp_at_dcptech.com; 'Cisco certification'
> Subject: RE: ATM-AToM
> 
> You are trying to perform the role of the CE in this.  The CE needs to
> do
> OAM between CE locations and make routing decisions based on the best
> path,
> This is not the role of the provider in this scenario to decide how to
> forward traffic over the two paths.  That is the role of the customer.
> 
> 
> 
> Regards,
> 
> 
> 
> Tyson Scott - CCIE #13513 R&S, Security, and SP
> Managing Partner / Sr. Instructor - IPexpert, Inc.
> Mailto: tscott_at_ipexpert.com
> 
> 
> 
> 
> 
> From: Mohamed Osama [mailto:tetoo_me_at_hotmail.com]
> Sent: Thursday, January 13, 2011 11:56 AM
> To: dcp_at_dcptech.com; tscott_at_ipexpert.com; Cisco certification
> Subject: RE: ATM-AToM
> 
> 
> 
> Dear All,
> 
> 
> 
> Yes thats True and CE want Us To Provide Him with Another Layer 2
> circuit so
> that in this case CE will be Connected to our PE1 with 2 Layer 2
> Circuits on
> Separate 2 ATM interfaces on PE1 router and For Sure our PE1 will have
> xconnect to the other End PE2.
> 
> 
> 
> In My scenario,I'm talking about the Layer 2 circuit,How I can Detect
> if the
> ATM Layer 2 Circuit between PE and CE is UP or Down,
> 
> and if it's Down,how can i provision the Other Layer 2 Circuit to be
> used
> For AToM Layer 2 VPN,and if both up how load balance and load sharing
> will
> be down.
> 
> 
> 
> Its similar to the case when having 2 static Route under VRF with
> Tracking
> IP SLA but this for LAyer 3 customer which is Using Routing not LAyer 2
> vpn
> :) ---------- I said this as an example Just to clear my point :D
> 
> 
> 
> Thanks,
> 
> Osama
> 
> > From: dcp_at_dcptech.com
> > To: tetoo_me_at_hotmail.com; tscott_at_ipexpert.com; ccielab_at_groupstudy.com
> > Subject: RE: ATM-AToM
> > Date: Thu, 13 Jan 2011 11:38:54 -0500
> >
> > AToM requires the PE's to have L3 connectivity. The PE/CE connection
> is
> L2.
> > On the PE ATM interface you will have "xconnect 1.1.1.1 100 encap
> mpls"
> > where 1.1.1.1 is the loopback on the other PE.
> >
> > David
> >
> > --
> > http://dcp.dcptech.com
> >
> >
> > > -----Original Message-----
> > > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> Behalf Of
> > > Mohamed Osama
> > > Sent: Thursday, January 13, 2011 11:02 AM
> > > To: tscott_at_ipexpert.com; Cisco certification
> > > Subject: RE: ATM-AToM
> > >
> > > Dear Tyson,
> > > what if there is no layer 3 information between PE Router and the
> > > customer Router,only layer 2 ATM circuit and we are offering them 2
> > > Layer 2 AToM circuit for redundancy.
> > > How can i do that??beside i can't do any changes at the Customer
> > > Router.
> > > I appreciate helping me in this case.
> > > Thanks,Osama
> > >
> > > > From: tscott_at_ipexpert.com
> > > > To: tetoo_me_at_hotmail.com; ccielab_at_groupstudy.com
> > > > Subject: RE: ATM-AToM
> > > > Date: Thu, 13 Jan 2011 10:26:02 -0500
> > > >
> > > > If the OAM loopback responses are lost then the PVC goes down
> which
> > > will
> > > > force the traffic in the other direction. I am under the
> presumption
> > > you
> > > > have some L3 traffic running across the connection. Simply
> routing
> > > of the
> > > > connection between the sites should do. I am under the hope that
> you
> > > > designed this terminating the AToM with Loopbacks as the
> > > source/destination
> > > > allowing simply routing protocol path preference to decide the
> path
> > > to take.
> > > >
> > > >
> > > >
> > > > Regards,
> > > >
> > > >
> > > >
> > > > Tyson Scott - CCIE #13513 R&S, Security, and SP
> > > > Managing Partner / Sr. Instructor - IPexpert, Inc.
> > > > Mailto: tscott_at_ipexpert.com
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > From: Mohamed Osama [mailto:tetoo_me_at_hotmail.com]
> > > > Sent: Thursday, January 13, 2011 10:20 AM
> > > > To: tscott_at_ipexpert.com; Cisco certification
> > > > Subject: RE: ATM-AToM
> > > >
> > > >
> > > >
> > > > Dear Tyson,
> > > >
> > > >
> > > >
> > > > Thanks For Your Valuable Information,
> > > >
> > > > But How can i use It To monitor and Manage The Customer Layer 2
> VPN
> > > Circuit,
> > > >
> > > > so that if The First AToM layer 2 VPN circuit can Detect its
> Down,
> > > >
> > > >
> > > >
> > > > then Can Utilize The Other Layer 2 VPN Link To be Active In The
> Layer
> > > 2
> > > > AToM?
> > > >
> > > >
> > > >
> > > > Any Advices About This?what configurations should be applied to
> the
> > > Router
> > > > to Solve that?
> > > >
> > > >
> > > >
> > > > I appreciate Your Response
> > > >
> > > >
> > > >
> > > > Thanks,
> > > >
> > > > Osama
> > > >
> > > > > From: tscott_at_ipexpert.com
> > > > > To: tetoo_me_at_hotmail.com; ccielab_at_groupstudy.com
> > > > > Subject: RE: ATM-AToM
> > > > > Date: Thu, 13 Jan 2011 09:22:34 -0500
> > > > >
> > > > > It is called OAM management.
> > > > >
> > > >
> > >
> http://www.cisco.com/en/US/tech/tk39/tk51/technologies_q_and_a_item0918
> > > 6a008
> > > > > 0111154.shtml
> > > > >
> > > > >
> > > > > Regards,
> > > > >
> > > > > Tyson Scott - CCIE #13513 R&S, Security, and SP
> > > > > Managing Partner / Sr. Instructor - IPexpert, Inc.
> > > > > Mailto: tscott_at_ipexpert.com
> > > > >
> > > > >
> > > > > -----Original Message-----
> > > > > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> > > Behalf Of
> > > > > Mohamed Osama
> > > > > Sent: Thursday, January 13, 2011 6:49 AM
> > > > > To: Cisco certification
> > > > > Subject: ATM-AToM
> > > > >
> > > > > Dear Experts,
> > > > >
> > > > > Can you please help me with this issue :)
> > > > >
> > > > > I need to monitor the status of Layer 2 Circuit Carrying ATom-
> > > ATM,because
> > > > > the Customer is connected with two layer 2 links through
> ATM/DSLAM
> > > to our
> > > > PE
> > > > > Router.
> > > > > I need to find a way so that i can monitor the Status of Layer
> 2
> > > LINK
> > > > > carring AToM to Be able to Utlize the Primary link and Backup
> Link.
> > > > >
> > > > > CPE------two Links-----ATM DSLAM---------Two Links-------PE
> > > > >
> > > > > Kindly notes i can't monitor the Status of Interfaces because
> the
> > > DSLAM
> > > > > doesnt provide it and we need to check layer 2 end to end.
> > > > >
> > > > > Any Mechanism To Provide that Solution?
> > > > >
> > > > > thanks,
> > > > > Osama
> > > > >
> > > > >
> > > > > Blogs and organic groups at http://www.ccie.net
> > > > >
> > > > >
> > >
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