From: ccie2be (ccie2be@nyc.rr.com)
Date: Sun Mar 13 2005 - 12:31:13 GMT-3
Rich,
I've also been going this topic lately.
I'm not sure if you're saying something different from this, but let me
highlight this point.
When using ppp multilink, there must be only 2 endpoints. I think of ppp
multilink as a WAN version of EtherChannel. So, if you have a hub and spoke
topology, you can't have the same ppp multilink connection between the hub
and both spokes. You can have a ppp multilink between the hub and 1 spoke
and a different ppp multilink connection between the hub and the other
spoke.
Regarding John's question of whether both sides must use a virtual-template
if one side is using a virtual-template - here's my thought:
As a practical matter, probably yes because the reason you're using
virtual-templates in the first place is to be able to use features like chap
authentication which isn't available without ppp over f/r.
But, upon further reflection, I'm going to change my answer to ALWAYS yes
regardless of what ppp features are used. It occurs to me that when ppp
over F/R is configured on one side what's going on is that the user data is
being encap'ed in ppp which is then encap'ed in f/r.
If ppp over f/r is NOT being used on both sides there will be an encap
mismatch and it won't work.
I haven't tested this so if I'm incorrect or missing a key point, please let
me know.
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Rich
Kettelson
Sent: Sunday, March 13, 2005 9:43 AM
To: 'John Matus'; 'lab'
Subject: RE: virtual-template question
John,
By default, links that use the same username are bundled together into the
same MP virtual connection.
r4#sho ppp multilink
Virtual-Access2, bundle name is r6
Bundle up for 4d12h
0 lost fragments, 0 reordered, 0 unassigned
0 discarded, 0 lost received, 1/255 load
0x5 received sequence, 0x5 sent sequence
Member links: 2 (max not set, min not set)
Vi1, since 3d12h, no frags rcvd, 375000 weight, 1496 frag size !the
frame PVC
Se0/1, since 3d12h, no frags rcvd, 5790 weight, 1496 frag size !S0/1 ppp
int
To get this to "work" you would need to create a 2 PPPoFR links on the hub,
one to each spoke, and then you're right back where you started with the
PVC's :)
Check out the Multilink section here:
http://www.cisco.com/pcgi-bin/Support/browse/psp_view.pl?>p=Technologies:PPP
&s=Implementation_and_Configuration#Samples_and_Tips
And the PPPoFR section here:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/products_feature_guid
e09186a008008744a.html
Hope this is helpful. I have been trying to increase my knowledge on this
subject over the last few days, so am by no means an expert. Feel free to
challenge me.
Rich
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of John
Matus
Sent: Saturday, March 12, 2005 8:33 PM
To: Rich Kettelson; 'lab'
Subject: Re: virtual-template question
i'm not sure i follow your config.....
i don't see where you have bound 2 interface to 1 virtual-template.
when you issue the command "frame-relay interface-dlci 304 ppp
Virtual-Template1" does this mean that the other end must be running ppp
over frame relay as well? (lightbulb goes on....!) so i'd have to create a
virtual-template on both the the hub and spokes for this to work....eh?
Regards,
John D. Matus
MCSE, CCNP
Office: 818-782-2061
Cell: 818-430-8372
jmatus@pacbell.net
----- Original Message -----
From: "Rich Kettelson" <rkettelson@mn.rr.com>
To: "'John Matus'" <jmatus@pacbell.net>; "'lab'" <ccielab@groupstudy.com>
Sent: Saturday, March 12, 2005 4:16 PM
Subject: RE: virtual-template question
I've been messing with this a bit. PPP (MLPPP) assumes 2 endpoints, and
fragments packets between the physical links in the ML Bundle, so if DLCI
304 and 305 both terminated to the same remote router it will work.
Here's a config snippet with MLPPP working over one PPP connection and one
frame connection (between the same 2 routers).
!
interface Serial0/0.1 point-to-point
frame-relay interface-dlci 406 ppp Virtual-Template1
class SOMECLASS
!
interface Serial0/1
no ip address
encapsulation ppp
ppp authentication chap
ppp multilink
!
interface Virtual-Template1
ip unnumbered Loopback1
service-policy output SOMEPOLICY
ppp multilink
ppp multilink interleave
!
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of John
Matus
Sent: Saturday, March 12, 2005 5:26 PM
To: lab
Subject: virtual-template question
if you have 3 routers in a hub and spoke topology, and on the hub you create
two p2p interfaces w/ dlci's, can you bind those p2p interfaces into a
virtual-template which acts like both p2p's are actually 1 multipoint
interface? i tried it and i can't seem to get it to work so i'm thinking
that perhaps there is some limitation on this:<??>
HUB
interface Serial1/0.34 point-to-point
frame-relay interface-dlci 304 ppp Virtual-Template1
!
interface Serial1/0.35 point-to-point
frame-relay interface-dlci 305 ppp Virtual-Template1
interface Virtual-Template1
ip address 164.1.0.3 255.255.255.0
Regards,
John D. Matus
MCSE, CCNP
Office: 818-782-2061
Cell: 818-430-8372
jmatus@pacbell.net
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