2921 PPP multilink

[curtmcgirt]

i have an existing PPP multilink with two T1 circuits in it. we ordered two new T1 circuits (same ISP, and they know to put them into the bundle). all the cards are wic1-t. i copied the configuration from the existing serial interfaces (0 and 1) to the new serial interfaces (2 and 3). see below. when i enable the new interfaces, i get status up/protocol down. interface shows "multilink closed." debug ppp negotiation shows they are getting timeout events. i removed one from the multilink and it did not change the ppp negotiation behavior. is this something that's misconfigured on the ISP side? or is there something i need to configure on the controllers to get them to be in the bundle?

so, again, with the configuration below, 0/0/0 and 0/1/0 are working fine, but 0/2/0 and 0/3/0 are not.

interface Multilink99

description [removed]

bandwidth 6000

ip address [removed]

ip access-group BLOCK in

no ip unreachables

ip flow ingress

ip flow egress

no ip route-cache cef

load-interval 30

ppp chap hostname [removed]

ppp multilink

ppp multilink links minimum 1 mandatory

ppp multilink group 99

ppp multilink fragment disable

no cdp enable

hold-queue 2000 out

!

interface Serial0/0/0

description [removed]

no ip address

encapsulation ppp

ppp chap hostname [removed]

ppp multilink

ppp multilink group 99

!

interface Serial0/1/0

 description [removed]

no ip address

encapsulation ppp

ppp chap hostname [removed]

ppp multilink

ppp multilink group 99

!

interface Serial0/2/0

 description [removed]

no ip address

encapsulation ppp

ppp chap hostname [removed]

ppp multilink

ppp multilink group 99

!

interface Serial0/3/0

 description [removed]

no ip address

encapsulation ppp

ppp chap hostname [removed]

ppp multilink

ppp multilink group 99

[Masoud Pourshabanian]

Hello,

Does your multilink interface become up/up when you only have your two old serial interfaces bundled?

Are your new serial interfaces UP/UP by themself when they are not part of the bundle. Check to see their encapsulation are configured PPP on your ISP side. Sometimes, they forget to change it from HDLC to PPP.

Call your ISP and check the config with them. Probably they did not add other interfaces to the current bundle.  Also check this parameter with them "ppp multilink links minimum 1 mandatory"

Hope it helps,

[curtmcgirt]

Thanks guys.  I'm not in front of the router right now, but to clarify, the ppp multilink bundle has existed with the two existing circuits for several years. It works with the existing circuits, and continues to work even if I enable one or both of the new circuits. It's just the two new circuits that don't work. All four cards are the same hardware-- I believe wic1-t csu/dsu v2.

When I do a "show controller 0/2/0" command, what should I be looking for in the output? I don't see anything at all in "show run" about controllers.

[paul driver]

Hello

Any errors regarding line code/clock rate /cable type/alarms etc..

try - Show controller serial 

res

Paul

[curtmcgirt]

i am getting up/down on 0/2/0 and 0/3/0. the only real difference i see in show controller for those is the "Transmitter CTS losts" are higher. i'm assuming you don't need to see all the registers, so the rest of my output is below.

#show controller serial 0/0/0
Interface Serial0/0/0
Hardware is SCC with Integrated FT1 CSU/DSU module

Clock Freq detected Rx clk/Tx clk 1472554/1472552 (+-10%)

idb at 0x21B27DD4, driver data structure at 0x3CDAF334
wic_info 0x21B28CE4

                         (addr 0x108B0074): 0x00000000

76 input aborts on receiving flag sequence
0 throttles, 0 enables
0 overruns
0 transmitter underruns
3 transmitter CTS losts
41072212 rxintr, 27526005 txintr, 0 rxerr, 0 txerr
0 tx_abort 0 tx_reset

#show controller serial 0/1/0
Interface Serial0/1/0
Hardware is SCC with Integrated FT1 CSU/DSU module

Clock Freq detected Rx clk/Tx clk 1472554/1472554 (+-10%)

idb at 0x3CDC48AC, driver data structure at 0x21B3A700
wic_info 0x3CDC57BC

3 input aborts on receiving flag sequence
0 throttles, 0 enables
1 overruns
0 transmitter underruns
6 transmitter CTS losts
41061113 rxintr, 27523247 txintr, 0 rxerr, 0 txerr
0 tx_abort 0 tx_reset

#show controller serial 0/2/0
Interface Serial0/2/0
Hardware is SCC with Integrated FT1 CSU/DSU module

Clock Freq detected Rx clk/Tx clk 1472552/1472554 (+-10%)

idb at 0x21B3BEA0, driver data structure at 0x3CDC7D88
wic_info 0x21B3CDB0

0 input aborts on receiving flag sequence
0 throttles, 0 enables
0 overruns
0 transmitter underruns
406 transmitter CTS losts
0 rxintr, 2313 txintr, 0 rxerr, 0 txerr
0 tx_abort 0 tx_reset

#show controller serial 0/3/0
Interface Serial0/3/0
Hardware is SCC with Integrated FT1 CSU/DSU module

Clock Freq detected Rx clk/Tx clk 1472552/1472552 (+-10%)

idb at 0x3CDC9CDC, driver data structure at 0x21B3DCD4
wic_info 0x3CDCABEC

0 input aborts on receiving flag sequence
0 throttles, 0 enables
0 overruns
0 transmitter underruns
329 transmitter CTS losts
0 rxintr, 1884 txintr, 0 rxerr, 0 txerr
0 tx_abort 0 tx_reset

[Masoud Pourshabanian]

Hello,

You need to call your service provider If you see up/down. Just make sure, you have the same encapsulation on both sides. Default is HDLC. Change your side to HDLC for test to see if it becomes UP/UP. There might be misconfiguration on ISP side.

interface Serial0/2/0

 encapsulation HDLC  [ just for test]

show interface Serial0/2/0 [to see it becomes UP/UP]

Masoud

[paul driver]

Hello

Just one thing - I think I have ask this before not sure-  these are basic Wic cards not controller cards correct - So your not applying any the framing timeslots etc...?

Lasty just curious can you post

sh controllers ser0/x/0 | in DTE|DCE

res
Paul

[Masoud Pourshabanian]

show interface Serial0/2/0 

show interface Serial0/3/0

Try these commands. The output must be UP UP. Both interface and line protocol,

Masoud

[paul driver]

Hello

Are keepalives supposed to be enabled in this configuration?

Are you using legacy serial interfaces or T|E controllers cards- if the later is the framing/time slots/line code etc..enabled and correct?

Lasty as masoud has stated make sure you and the ISP are in line with this configuration and physical interfaces

Show ppp multilink

Show controllers xx

res

Paul