many lost fragments on ppp-multilink connections

Hi,

here works many E1-connectoins (PRI dial-connectoins) from different
routers (3620 or 26xx) with e1 interfaces to AS5400 (with only e1) and
an C7509 with e1-interfaces.

For many routers that works properly but on some whe have many problems
with the performance. In the output for show ppp multlink, i can see on
this routers many lost fragments. Have you some tips for me?

Here is a smpleconfig:

ROUTER-BeschA#sh run
Building configuration...

Current configuration : 1571 bytes
!
version 12.2
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
!
hostname ROUTER
!
username cisco1 password xyz
username dallas password xyz
memory-size iomem 30
clock timezone UTC 1
clock summer-time MESZ recurring last Sun Mar 2:00 last Sun Oct 2:00
ip subnet-zero
no ip gratuitous-arps
ip cef
!
!
no ip domain-lookup
!
isdn switch-type primary-net5
!
controller E1 1/0
pri-group timeslots 1-31
!
!
!
interface Loopback10
ip address 10.1.2.3 255.255.255.255
!
interface Ethernet0/0
ip address 10.0.1.1 255.255.255.0
half-duplex
no cdp enable
!
interface Serial1/0:15
ip unnumbered Loopback10
encapsulation ppp
no ip route-cache cef
ip mroute-cache
no logging event link-status
load-interval 30
dialer enable-timeout 6
dialer wait-for-carrier-time 5
dialer string 1
dialer hold-queue 100
dialer load-threshold 80 either
dialer-group 1
isdn switch-type primary-net5
ppp authentication chap
ppp multilink
ppp multilink interleave
ppp timeout multilink link remove 20
!
ip classless
ip route 10.0.0.0 255.0.0.0 Serial1/0:15
no ip http server
!
dialer-list 1 protocol ip permit
snmp-server community XXX RO
snmp-server enable traps tty
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
password xyz
login
!
ntp server 10.9.8.7
end

and an show ppp multilink


ROUTER#sh pp mu

Virtual-Access1, bundle name is dallas
Bundle up for 2d22h
Dialer interface is Serial1/0:15
14233 lost fragments, 1283236 reordered, 0 unassigned
31045 discarded, 509 lost received, 78/255 load
0x377D9E received sequence, 0x228CC8 sent sequence
Member links: 12 (max not set, min not set)
Se1/0:26, since 2d22h, last rcvd seq 377D96, 240 weight, 232 frag size
Se1/0:23, since 2d22h, last rcvd seq 377D9A, 240 weight, 232 frag size
Se1/0:24, since 2d22h, last rcvd seq 377D9B, 240 weight, 232 frag size
Se1/0:12, since 2d22h, last rcvd seq 377D9C, 240 weight, 232 frag size
Se1/0:2, since 2d22h, last rcvd seq 377D9D, 240 weight, 232 frag size
Se1/0:30, since 00:02:08, last rcvd seq 377D8A, 240 weight, 232 frag
size
Se1/0:29, since 00:01:53, last rcvd seq 377D8B, 240 weight, 232 frag
size
Se1/0:28, since 00:00:46, last rcvd seq 377D95, 240 weight, 232 frag
size
Se1/0:27, since 00:00:34, last rcvd seq 377D8D, 240 weight, 232 frag
size
Se1/0:25, since 00:00:18, last rcvd seq 377D8E, 240 weight, 232 frag
size
Se1/0:22, since 00:00:12, last rcvd seq 377D8F, 240 weight, 232 frag
size
Se1/0:21, since 00:00:06, last rcvd seq 377D90, 240 weight, 232 frag
size



thx for any tips

Gerd Thuemmler
Germany

Sorry for my bad english, but its so long that learn it in scool