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

[Oliver Boehmer (oboehmer)]

Walter De Smedt <> wrote on Thursday, June 23, 2005 12:21 PM:

> 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?

you forgot "dialer load-threshold <n>" on your 836. Without this
command, we won't add a second link..  
Not sure what the problem is about the non-working bundle (i.e. no
traffic)? We'd need to see more of your config and more debugs (you did
not send the complete PPP debug).

	oli


> 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
> 
> 
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