11-21-2013 12:22 PM - edited 03-04-2019 09:38 PM
Hello,
I have an older 2811 router running 'c2800nm-advipservicesk9-mz.124-10.bin' in Mexico. Two VWIC2-1MFT-G703 cards are installed for the E1 lines (2Mbt) and combined into a multilink. Getting output drops on the multilink but the serial lines are clean. Odd thing is, I get dropped packets when pinging the multilink. CPU Proc is 7%. QOS is enabled/running.
I have a Cisco TAC case open for the output drops.
Really curious as to how the multilink can fail pings with low proc?
Thanks
Solved! Go to Solution.
11-21-2013 01:03 PM
I'm not sure where icmp falls in the mix of your class-maps, so it's hard for me to tell if it's getting classified or dumped into the default queue. I don't see any errors on the interfaces/links at all, so I doubt this is a carrier issue. Are there any other issues that you've noticed outside of losing a packet or two from a ping?
HTH,
John
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11-21-2013 12:25 PM
Did this just start? Output drops are normal if you're running qos on the interface:
Multilink1 is up, line protocol is up
Hardware is multilink group interface
MTU 1500 bytes, BW 3072 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 30/255, rxload 54/255
Encapsulation PPP, LCP Open, multilink Open
Open: IPCP, loopback not set
Keepalive set (10 sec)
DTR is pulsed for 2 seconds on reset
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters 2w6d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 35505
Queueing strategy: Class-based queueing
Output queue: 0/1000/0/94660 (size/max total/drops/interleaves)
Can you post the config of the multilink interface and the two serials?
HTH,
John
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11-21-2013 12:36 PM
Slowly came to my attention as a Oracle DB app that is time delay sensitive started disconnects and then complaints.
interface Multilink1
bandwidth 4098
ip address 10.19.191.65 255.255.255.252
no cdp enable
ppp multilink
ppp multilink links minimum 1
ppp multilink group 1
max-reserved-bandwidth 100
service-policy output EGRESS_QUEUING_TO_
interface Serial0/0/0:0
bandwidth 2048
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
encapsulation ppp
ppp multilink
ppp multilink group 1
max-reserved-bandwidth 100
interface Serial0/1/0:0
bandwidth 2048
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
encapsulation ppp
ppp multilink
ppp multilink group 1
max-reserved-bandwidth 100
sh int mu1
Multilink1 is up, line protocol is up
Hardware is multilink group interface
Internet address is 10.19.191.65/30
MTU 1500 bytes, BW 4098 Kbit, DLY 100000 usec,
reliability 255/255, txload 12/255, rxload 17/255
Encapsulation PPP, LCP Open, multilink Open
Open: IPCP, loopback not set
Keepalive set (10 sec)
DTR is pulsed for 2 seconds on reset
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters 01:35:47
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1608
Queueing strategy: Class-based queueing
Output queue: 1/1000/64/1608 (size/max total/threshold/drops)
Conversations 1/3/256 (active/max active/max total)
Reserved Conversations 4/4 (allocated/max allocated)
Available Bandwidth 3482 kilobits/sec
5 minute input rate 275000 bits/sec, 52 packets/sec
5 minute output rate 195000 bits/sec, 48 packets/sec
632772 packets input, 487272157 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
519285 packets output, 181449630 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
ping 10.19.191.65 rep 1000 siz 1000
Type escape sequence to abort.
Sending 1000, 1000-byte ICMP Echos to 10.19.191.65, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!
Success rate is 99 percent (998/1000), round-trip min/avg/max = 24/26/136 ms
sh int mu1
11-21-2013 12:44 PM
Can you also post "show int s0/0/0:0" and "show int s0/1/0:0"?
HTH,
John
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11-21-2013 12:48 PM
sh int Serial0/0/0:0
Serial0/0/0:0 is up, line protocol is up
Hardware is GT96K Serial
MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
reliability 255/255, txload 12/255, rxload 33/255
Encapsulation PPP, LCP Open, multilink Open
Link is a member of Multilink bundle Multilink1, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 01:48:58
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair [suspended, using FIFO]
FIFO output queue 0/40, 0 drops
5 minute input rate 268000 bits/sec, 43 packets/sec
5 minute output rate 99000 bits/sec, 49 packets/sec
351267 packets input, 266818227 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
385063 packets output, 102263244 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Timeslot(s) Used: UNFRAMED, SCC: 0, Transmitter delay is 0 flags
sh int Serial0/1/0:0
Serial0/1/0:0 is up, line protocol is up
Hardware is GT96K Serial
MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
reliability 255/255, txload 12/255, rxload 32/255
Encapsulation PPP, LCP Open, multilink Open
Link is a member of Multilink bundle Multilink1, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 01:49:03
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair [suspended, using FIFO]
FIFO output queue 0/40, 0 drops
5 minute input rate 262000 bits/sec, 42 packets/sec
5 minute output rate 97000 bits/sec, 48 packets/sec
350977 packets input, 267035026 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
380241 packets output, 101338105 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Timeslot(s) Used: UNFRAMED, SCC: 0, Transmitter delay is 0 flags
11-21-2013 12:51 PM
I don't see any problems with the interfaces. Can you post "show controllers e1"?
Actually, can you post your policy-map for QoS? Have you tried taking this policy off to see if it's causing a problem? Are there other problems other than pinging your local interface?
HTH,
John
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11-21-2013 01:00 PM
sh controller e1
E1 0/0/0 is up.
Applique type is Channelized E1 - unbalanced
No alarms detected.
alarm-trigger is not set
Version info Firmware: 20060711, FPGA: 13, spm_count = 0
Framing is UNFRAMED, Line Code is HDB3, Clock Source is Line.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (675 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 7 15 minute intervals):
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
sh policy-map int mu1
Multilink1
Service-policy output: EGRESS_QUEUING_TO_ATT
Class-map: NMC (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group 178
0 packets, 0 bytes
5 minute rate 0 bps
Match: access-group 180
0 packets, 0 bytes
5 minute rate 0 bps
Queueing
Output Queue: Conversation 265
Bandwidth remaining 2 (%)
(pkts matched/bytes matched) 0/0
(depth/total drops/no-buffer drops) 0/0/0
exponential weight: 9
mean queue depth: 0
dscp Transmitted Random drop Tail drop Minimum Maximum Mark
pkts/bytes pkts/bytes pkts/bytes thresh thresh prob
af11 0/0 0/0 0/0 32 40 1/10
af12 0/0 0/0 0/0 28 40 1/10
af13 0/0 0/0 0/0 24 40 1/10
af21 0/0 0/0 0/0 200 300 1/10
af22 0/0 0/0 0/0 28 40 1/10
af23 0/0 0/0 0/0 24 40 1/10
af31 0/0 0/0 0/0 32 40 1/10
af32 0/0 0/0 0/0 28 40 1/10
af33 0/0 0/0 0/0 24 40 1/10
af41 0/0 0/0 0/0 32 40 1/10
af42 0/0 0/0 0/0 28 40 1/10
af43 0/0 0/0 0/0 24 40 1/10
cs1 0/0 0/0 0/0 22 40 1/10
cs2 0/0 0/0 0/0 24 40 1/10
cs3 0/0 0/0 0/0 26 40 1/10
cs4 0/0 0/0 0/0 28 40 1/10
cs5 0/0 0/0 0/0 30 40 1/10
cs6 0/0 0/0 0/0 200 300 1/10
cs7 0/0 0/0 0/0 34 40 1/10
ef 0/0 0/0 0/0 36 40 1/10
rsvp 0/0 0/0 0/0 36 40 1/10
default 0/0 0/0 0/0 20 40 1/10
Service-policy : NMC_CLASSIFICATION
Class-map: NMC_RP (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group 178
police:
cir 16000 bps, bc 8000 bytes
conformed 0 packets, 0 bytes; actions:
set-dscp-transmit cs6
exceeded 0 packets, 0 bytes; actions:
set-dscp-transmit cs6
conformed 0 bps, exceed 0 bps
Class-map: NMC_SNMP (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group 180
police:
cir 16000 bps, bc 8000 bytes
conformed 0 packets, 0 bytes; actions:
set-dscp-transmit af21
exceeded 0 packets, 0 bytes; actions:
set-dscp-transmit af21
conformed 0 bps, exceed 0 bps
Class-map: class-default (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
Class-map: COS1 (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: class-map match-all COS1_SAA
0 packets, 0 bytes
5 minute rate 0 bps
Match: ip dscp ef (46)
Match: access-group 179
Match: class-map match-all COS1_TRAFFIC
0 packets, 0 bytes
5 minute rate 0 bps
Match: access-group name ATT-COS1
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 616 (kbps) Burst 15400 (Bytes)
(pkts matched/bytes matched) 0/0
(total drops/bytes drops) 0/0
Service-policy : COS1_CLASSIFICATION
Class-map: COS1_TRAFFIC (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name ATT-COS1
police:
cir 616000 bps, bc 77000 bytes
conformed 0 packets, 0 bytes; actions:
set-dscp-transmit ef
exceeded 0 packets, 0 bytes; actions:
drop
conformed 0 bps, exceed 0 bps
Class-map: class-default (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
Class-map: COS2 (match-any)
9813 packets, 530483 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: class-map match-all COS2_SAA
0 packets, 0 bytes
5 minute rate 0 bps
Match: ip dscp af31 (26)
Match: access-group 179
Match: class-map match-all COS2_TRAFFIC
9813 packets, 530483 bytes
5 minute rate 0 bps
Match: access-group name ATT-COS2
Queueing
Output Queue: Conversation 266
Bandwidth remaining 59 (%)
(pkts matched/bytes matched) 378/20498
(depth/total drops/no-buffer drops) 0/0/0
exponential weight: 1
mean queue depth: 0
dscp Transmitted Random drop Tail drop Minimum Maximum Mark
pkts/bytes pkts/bytes pkts/bytes thresh thresh prob
af11 0/0 0/0 0/0 32 40 1/10
af12 0/0 0/0 0/0 28 40 1/10
af13 0/0 0/0 0/0 24 40 1/10
af21 0/0 0/0 0/0 32 40 1/10
af22 0/0 0/0 0/0 28 40 1/10
af23 0/0 0/0 0/0 24 40 1/10
af31 9813/530483 0/0 0/0 200 300 1/10
af32 0/0 0/0 0/0 28 40 1/10
af33 0/0 0/0 0/0 24 40 1/10
af41 0/0 0/0 0/0 32 40 1/10
af42 0/0 0/0 0/0 28 40 1/10
af43 0/0 0/0 0/0 24 40 1/10
cs1 0/0 0/0 0/0 22 40 1/10
cs2 0/0 0/0 0/0 24 40 1/10
cs3 0/0 0/0 0/0 26 40 1/10
cs4 0/0 0/0 0/0 28 40 1/10
cs5 0/0 0/0 0/0 30 40 1/10
cs6 0/0 0/0 0/0 32 40 1/10
cs7 0/0 0/0 0/0 34 40 1/10
ef 0/0 0/0 0/0 36 40 1/10
rsvp 0/0 0/0 0/0 36 40 1/10
default 0/0 0/0 0/0 20 40 1/10
Service-policy : COS2_CLASSIFICATION
Class-map: COS2_TRAFFIC (match-all)
9813 packets, 530483 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name ATT-COS2
police:
cir 552000 bps, bc 69000 bytes
conformed 9813 packets, 530483 bytes; actions:
set-dscp-transmit af31
exceeded 0 packets, 0 bytes; actions:
set-dscp-transmit af32
conformed 0 bps, exceed 0 bps
Class-map: class-default (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
Class-map: COS3 (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: class-map match-all COS3_SAA
0 packets, 0 bytes
5 minute rate 0 bps
Match: ip dscp af21 (18)
Match: access-group 179
Match: class-map match-all COS3_TRAFFIC
0 packets, 0 bytes
5 minute rate 0 bps
Match: access-group name ATT-COS3
Queueing
Output Queue: Conversation 267
Bandwidth remaining 30 (%)
(pkts matched/bytes matched) 0/0
(depth/total drops/no-buffer drops) 0/0/0
exponential weight: 1
mean queue depth: 0
dscp Transmitted Random drop Tail drop Minimum Maximum Mark
pkts/bytes pkts/bytes pkts/bytes thresh thresh prob
af11 0/0 0/0 0/0 32 40 1/10
af12 0/0 0/0 0/0 28 40 1/10
af13 0/0 0/0 0/0 24 40 1/10
af21 0/0 0/0 0/0 200 300 1/10
af22 0/0 0/0 0/0 28 40 1/10
af23 0/0 0/0 0/0 24 40 1/10
af31 0/0 0/0 0/0 32 40 1/10
af32 0/0 0/0 0/0 28 40 1/10
af33 0/0 0/0 0/0 24 40 1/10
af41 0/0 0/0 0/0 32 40 1/10
af42 0/0 0/0 0/0 28 40 1/10
af43 0/0 0/0 0/0 24 40 1/10
cs1 0/0 0/0 0/0 22 40 1/10
cs2 0/0 0/0 0/0 24 40 1/10
cs3 0/0 0/0 0/0 26 40 1/10
cs4 0/0 0/0 0/0 28 40 1/10
cs5 0/0 0/0 0/0 30 40 1/10
cs6 0/0 0/0 0/0 32 40 1/10
cs7 0/0 0/0 0/0 34 40 1/10
ef 0/0 0/0 0/0 36 40 1/10
rsvp 0/0 0/0 0/0 36 40 1/10
default 0/0 0/0 0/0 20 40 1/10
Service-policy : COS3_CLASSIFICATION
Class-map: COS3_TRAFFIC (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name ATT-COS3
police:
cir 280000 bps, bc 35000 bytes
conformed 0 packets, 0 bytes; actions:
set-dscp-transmit af21
exceeded 0 packets, 0 bytes; actions:
set-dscp-transmit af22
conformed 0 bps, exceed 0 bps
Class-map: class-default (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
Class-map: COS4 (match-any)
604993 packets, 212393151 bytes
5 minute offered rate 170000 bps, drop rate 0 bps
Match: class-map match-all COS4_SAA
0 packets, 0 bytes
5 minute rate 0 bps
Match: ip dscp default (0)
Match: access-group 179
Match: class-map match-all COS4_TRAFFIC
604993 packets, 212393151 bytes
5 minute rate 170000 bps
Match: access-group name ATT-COS4
Queueing
Output Queue: Conversation 268
Bandwidth remaining 8 (%)
(pkts matched/bytes matched) 129144/116955885
(depth/total drops/no-buffer drops) 0/1860/0
exponential weight: 1
mean queue depth: 0
dscp Transmitted Random drop Tail drop Minimum Maximum Mark
pkts/bytes pkts/bytes pkts/bytes thresh thresh prob
af11 0/0 0/0 0/0 32 40 1/10
af12 0/0 0/0 0/0 28 40 1/10
af13 0/0 0/0 0/0 24 40 1/10
af21 0/0 0/0 0/0 32 40 1/10
af22 0/0 0/0 0/0 28 40 1/10
af23 0/0 0/0 0/0 24 40 1/10
af31 0/0 0/0 0/0 32 40 1/10
af32 0/0 0/0 0/0 28 40 1/10
af33 0/0 0/0 0/0 24 40 1/10
af41 0/0 0/0 0/0 32 40 1/10
af42 0/0 0/0 0/0 28 40 1/10
af43 0/0 0/0 0/0 24 40 1/10
cs1 0/0 0/0 0/0 22 40 1/10
cs2 0/0 0/0 0/0 24 40 1/10
cs3 0/0 0/0 0/0 26 40 1/10
cs4 0/0 0/0 0/0 28 40 1/10
cs5 0/0 0/0 0/0 30 40 1/10
cs6 0/0 0/0 0/0 32 40 1/10
cs7 0/0 0/0 0/0 34 40 1/10
ef 0/0 0/0 0/0 36 40 1/10
rsvp 0/0 0/0 0/0 36 40 1/10
default 603140/210792251 1843/1600496 17/714 20 40 1/10
Service-policy : COS4_CLASSIFICATION
Class-map: COS4_TRAFFIC (match-all)
604993 packets, 212393151 bytes
5 minute offered rate 170000 bps, drop rate 0 bps
Match: access-group name ATT-COS4
police:
cir 96000 bps, bc 12000 bytes
conformed 467769 packets, 55669015 bytes; actions:
set-dscp-transmit default
exceeded 137231 packets, 156724446 bytes; actions:
set-dscp-transmit default
conformed 53000 bps, exceed 124000 bps
Class-map: class-default (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
Class-map: class-default (match-any)
746 packets, 4506 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
No I have not. Production location with voip going across as well as Oracle traffic.
11-21-2013 01:03 PM
I'm not sure where icmp falls in the mix of your class-maps, so it's hard for me to tell if it's getting classified or dumped into the default queue. I don't see any errors on the interfaces/links at all, so I doubt this is a carrier issue. Are there any other issues that you've noticed outside of losing a packet or two from a ping?
HTH,
John
*** Please rate all useful posts ***
11-21-2013 01:11 PM
The main problem is the connection back to a Oracle database. Any latency and the connection drops to where end user has to log back into this erp system.
There is a Telnor/Telmex LEC in the middle between us and AT&T providing two CSU/DSUs and, from what I can tell, they are DSL based? They hand off to AT&T then ride our MPLS back.
I might be barking up the wrong tree and these output drops on the MU1 are not even the issue. Just wanted a 3rd pair of eyes on it
I am going to have to review the QOS more in depth.
11-21-2013 04:58 PM
Hi Mark,
I see the drops and policing being used in the QOS, without the specifics on where the Oracle traffic resides in the QOS it is hard to locate an issue.
The dropping of pings on the multilink interface is odd, I don't see the use of a password or serial endpoint string on the serial interfaces. You may want to add the unique serial endpoint strings to the serial interfaces themselves, this may stabilize the multilink interface itself. I have had trouble in past with this issue.
The moment I see MPLS I look for MTU issues, some transceivers carriers use do not support jumbs and cause problems, easier to adjust than to locate the dodgy transceiver. Try a few pings with the DF bit set and larger sizes up to the max of 1472 for determining if the MTU is affected by MPLS in the mix. If the MTU is at issue you can use tcp mss adjust, or IP MTU on the multilink interface, set the tcp mss adjust 40 bytes less than the MTU you determine.
Cheers,
Brian
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