[cisco-nas] MLP and virtual-profiles on AS5850

Thu Jun 23 06:20:41 EDT 2005

Hi,

I want to set up ISDN backup on a Cisco 836 together with MLPPP. The MLP 
bundle seems to come up on both routers but no traffic passes over it. 
Also, the 836 does not add the 2nd channel to the MLP bundle.

Anybody any ideas?

thanks,

-walter

--

The config on the C836 is:

interface BRI0
 ip address negotiated
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 dialer idle-timeout 300
 dialer enable-timeout 5
 dialer string *********
 dialer-group 1
 isdn switch-type basic-net3
 isdn tei-negotiation preserve
 ppp authentication pap callin
 ppp pap sent-username tdsl0004 password 0 *******
 ppp multilink
end

On the AS5850, I use virtual-profiles since per-user configuration is 
stored on the AAA server. The config on the AS5850 is:

interface Serial0/1:15
no ip address
 encapsulation ppp
 dialer idle-timeout 0
isdn switch-type primary-net5
 isdn incoming-voice modem
 no cdp enable
 ppp authentication pap AQ
 ppp authorization AQ
 ppp multilink
end
!
virtual-profile if-needed
virtual-profile virtual-template 1
!
!
interface Virtual-Template1
 ip unnumbered Loopback0
 peer default ip address pool WAN_DYN
 ppp authentication pap callin AQ
 ppp multilink
end

When the call is initiated by the C836, following events occur:

*May 30 03:41:37.598: BR0:1 LCP:    EndpointDisc 1 c836-1 
(0x130901633833362D31)
*May 30 03:41:37.598: BR0:1 LCP: State is Open
*May 30 03:41:37.598: BR0:1 PPP: Phase is AUTHENTICATING, by the peer
*May 30 03:41:37.598: BR0:1 PAP: Using hostname from interface PAP
*May 30 03:41:37.598: BR0:1 PAP: Using password from interface PAP
*May 30 03:41:37.602: BR0:1 PAP: O AUTH-REQ id 12 len 22 from "tdsl0004"
*May 30 03:41:37.634: BR0:1 PAP: I AUTH-ACK id 12 len 5
*May 30 03:41:37.634: BR0:1 PPP: Phase is FORWARDING, Attempting Forward
*May 30 03:41:37.634: BR0:1 PPP: Phase is ESTABLISHING, Finish LCP
*May 30 03:41:37.638: BR0:1 MLP: Request add link to bundle
*May 30 03:41:37.638: BR0:1 PPP: Phase is VIRTUALIZED
*May 30 03:41:37.638: BR0:1 PPP: Queue IPCP code[1] id[1]
*May 30 03:41:37.638: BR0:1 MLP: Adding link to bundle
*May 30 03:41:37.650: Vi3 MLP: Added to huntgroup BR0
*May 30 03:41:37.650: Vi3 MLP: Clone from BR0
*May 30 03:41:37.650: Vi3 PPP: Phase is DOWN, Setup
*May 30 03:41:37.650: Vi3 PPP: Using dialer call direction
*May 30 03:41:37.654: Vi3 PPP: Treating connection as a callout
*May 30 03:41:37.654: Vi3 PPP: Phase is ESTABLISHING, Active Open
*May 30 03:41:37.654: Vi3 PPP: No remote authentication for call-out
*May 30 03:41:37.654: Vi3 LCP: O CONFREQ [Closed] id 1 len 23
*May 30 03:41:37.654: Vi3 LCP:    MagicNumber 0x12B92BAD (0x050612B92BAD)
*May 30 03:41:37.654: Vi3 LCP:    MRRU 1524 (0x110405F4)
*May 30 03:41:37.654: Vi3 LCP:    EndpointDisc 1 c836-1 
(0x130901633833362D31)
*May 30 03:41:37.658: %LINK-3-UPDOWN: Interface Virtual-Access3, changed 
state to up
*May 30 03:41:37.722: Vi3 MLP: Warning: bundle interface has only 
default configuration
*May 30 03:41:37.722: Vi3 MLP: Lost frag timeout too low for slippage 
constraints, increasing to 1524 ms
*May 30 03:41:37.722: Vi3 MLP: Added first link BR0:1 to bundle AS5850
*May 30 03:41:37.726: Vi3 PPP: Phase is UP
*May 30 03:41:37.726: Vi3 IPCP: O CONFREQ [Closed] id 1 len 10
*May 30 03:41:37.726: Vi3 IPCP:    Address 0.0.0.0 (0x030600000000)

c836-1#show ppp multilink

Virtual-Access3, bundle name is AS5850
  Endpoint discriminator is AS5850
  Bundle up for 00:15:47, 1/255 load
  Receive buffer limit 12192 bytes, frag timeout 1524 ms
  Dialer interface is BRI0
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x0 received sequence, 0x0 sent sequence
  Member links: 1 (max 2, min not set)
    BR0:1, since 00:15:47
No inactive multilink interfaces

On the AS5850:
*Jan 31 23:43:06.347: Se0/1:5 MLP: Request add link to bundle
*Jan 31 23:43:06.347: Se0/1:5 MLP: Adding link to bundle
*Jan 31 23:43:06.347: Vi3 MLP: VP: Clone from Vtemplate 1 block=1
*Jan 31 23:43:06.347: VT[Vi3]:Added new vtemplate cloneblk, now cloning 
from vtemplate
*Jan 31 23:43:06.347: VT[Vi3]:ip unnumbered Loopback0
*Jan 31 23:43:06.347: VT[Vi3]:Virtual-Template1 has no command strings 
to clone
*Jan 31 23:43:06.351: Vi3 MLP: Lost frag timeout too low for slippage 
constraints, increasing to 1524 ms
*Jan 31 23:43:06.351: Vi3 MLP: Added first link Se0/1:5 to bundle c836-1

AS5850#show ppp multilink

Virtual-Access3, bundle name is c836-1
  Username is tdsl0004
  Endpoint discriminator is c836-1
  Bundle up for 00:02:11, 1/255 load
  Receive buffer limit 12192 bytes, frag timeout 1524 ms
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x0 received sequence, 0x0 sent sequence
  Member links: 1 (max not set, min not set)
    Se0/1:5, since 00:02:11
No inactive multilink interfaces