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(ASCEND) Frame Relay and MAX TNT


We have been running a frame relay connection with 3 PVC's on a Cisco 4000
for almost 2 years with no problems.  I am currently attempting to move
the frame relay connection to a port on a frameline card on one of our MAX
TNT units, but I haven't had much luck.

The MAX TNT has 40MB memory, frameline card, 192hdlc card, running
2.0.3... the same problems were experienced when we were running 1.3ap24.

The routers at the 3 remote sites are Cisco 2501 units.

When I move the frame relay connection over to the MAX TNT, 2 of the 3
connections come up with no problems.  I can ping the serial interfaces on
the remote ends of the connections.  For some reason, I cannot ping the
serial interface on the remote end of the third connection.

With the exception of IP addresses and DLCI info, all the Cisco 2501
routers and MAX TNT connection profiles are configured the same.
Below are configuration examples from the connection that will not come
up:

The remote Cisco 2501 (DLCI 17... IOS 11.0):

interface Serial1
 ip address xxx.xxx.xxx.138 255.255.255.252
 no ip mroute-cache
 encapsulation frame-relay IETF
 no ip route-cache
 frame-relay map ip xxx.xxx.xxx.137 16 broadcast IETF

Connection profile info from the MAX TNT (DLCI 16):

admin> list fr-options
frame-relay-profile = athens_frame
dlci = 17
circuit-name = ""
fr-direct-enabled = no
fr-direct-profile = ""
fr-direct-dlci = 16
fr-enabled = yes
fill-1 = 0                

admin> list ip-options
ip-routing-enabled = yes
vj-header-prediction = yes
assign-address = no
fill-1 = 0
remote-address = xxx.xxx.xxx.138/30
netmask-remote = 255.255.255.252
if-remote-address = 0.0.0.0
local-address = xxx.xxx.xxx.137/30
netmask-local = 255.255.255.252
routing-metric = 1
down-metric = 7
preference = 60
down-preference = 120
private-route = no
multicast-allowed = no
address-pool = 0
auth-pool-address = 0.0.0.0
ip-direct = 0.0.0.0
rip = routing-off
route-filter = ""
ospf-options = { no 0.0.0.0 normal 30 120 5 simple ascend0 10 1000 type-1
c0:00+
multicast-rate-limit = 100

This is how I have the frame-relay profile configured on the MAX TNT:

fr-name* = athens_frame
active = yes
nailed-up-group = 6
nailed-mode = ft1
called-number-type = 2
switched-call-type = 64k-restricted
phone-number = ""
billing-number = ""
transit-number = ""
link-mgmt = ansi-t1.617d
call-by-call-id = 0
link-type = dte
n391-val = 6
n392-val = 3
n393-val = 4
t391-val = 10
t392-val = 15
MRU = 1484
dceN392-val = 3
dceN393-val = 4

and the route...

admin> list
dest-address = xxx.xxx.xxx.0/24
netmask = 255.255.255.0
gateway-address = xxx.xxx.xxx.138
metric = 1
cost = 1
preference = 60
third-party = no
ase-type = type-1
ase-tag = c0:00:00:00
private-route = no
active-route = yes
ase7-adv = N/A 

Although the connection is down, the Cisco on the remote end appears to
have no problems...

wavgw-e0#sh int ser 1
Serial1 is up, line protocol is up
  Hardware is HD64570
  Internet address is xxx.xxx.xxx.138 255.255.255.252
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 5/255
  Encapsulation FRAME-RELAY IETF, loopback not set, keepalive set (10 sec)
  LMI enq sent  1233, LMI stat recvd 1232, LMI upd recvd 0, DTE LMI up
  LMI enq recvd 0, LMI stat sent  0, LMI upd sent  0
  LMI DLCI 0  LMI type is ANSI Annex D  frame relay DTE

wavgw-e0#sh frame-relay pvc

PVC Statistics for interface Serial1 (Frame Relay DTE)

DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1

  input pkts 208550        output pkts 245627       in bytes 102985688
  out bytes 49290407       dropped pkts 55          in FECN pkts 0
  in BECN pkts 0           out FECN pkts 0          out BECN pkts 0
  in DE pkts 38            out DE pkts 0
  pvc create time 3:25:56  last time pvc status changed 2:49:26

wavgw-e0#sh frame-relay lmi

LMI Statistics for interface Serial1 (Frame Relay DTE) LMI TYPE = CCITT
  Invalid Unnumbered info 0             Invalid Prot Disc 0
  Invalid dummy Call Ref 0              Invalid Msg Type 0
  Invalid Status Message 0              Invalid Lock Shift 0
  Invalid Information ID 0              Invalid Report IE Len 0
  Invalid Report Request 0              Invalid Keep IE Len 0
  Num Status Enq. Sent 1244             Num Status msgs Rcvd 1243
  Num Update Status Rcvd 0              Num Status Timeouts 1

The MTU on all the remote Cisco units is 1500.  I read somewhere that the
MRU on the Ascend unit should be 16 bytes less than the remote units.
When I changed the MRU on the Ascend to 1484, that is when 2 of the 3
connections would come up... before that, none of the connections would
come up.

This problem has me completely stumped.  I have checked out every relevant
mailing list, FAQ, and newsgroup, and still have no answers.  I have
spoken with 3 different Ascend representatives about the problem, but they
have no answers.

Any assistance would be greatly appreciated!

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