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Webcast-Catalyst9k
New Member

DLSW+ very very very Slow throughput

Hi all.

We have realized a test dlsw connection (all via ethernet), between two as400 systems.

We have tried first a file transfer using a back-to-back connection (using a crossover cable), and time to complete copy is 4 minutes.

So we have tried dlsw:

as400_1----r1--------r2-----as400_2

and performance is 4 hours (!!!!!).

We have checked all checkable, duplex mismatch (nothing), cable, ios releases, changed routers, but file transfer is very slow...

We understand that we can't obtain same performance like with a crossover cable, but I think that 4 hours is too much...

Configuration of routers are specular, first is:

service timestamps debug datetime msec

service timestamps log datetime msec

service password-encryption

!

logging buffered 51200 warnings

enable secret 5 <removed>

enable password 7 <removed>

!

resource policy

!

mmi polling-interval 60

no mmi auto-configure

no mmi pvc

mmi snmp-timeout 180

ip cef

!

ip tcp window-size 750000

ip tcp path-mtu-discovery

!

no ip domain lookup

!

dlsw local-peer peer-id 172.20.17.17 init-pacing-window 300 max-pacing-window 650

dlsw remote-peer 0 tcp 172.20.16.16 tcp-queue-max 500

dlsw bridge-group 5

!

interface FastEthernet0/0

description SNA

ip address 172.20.17.17 255.255.255.0

speed 100

full-duplex

bridge-group 5

!

interface FastEthernet0/1

description DLSW

ip address 172.23.65.38 255.255.255.252

speed 100

full-duplex

!

ip route 172.20.16.0 255.255.255.0 172.23.65.37

!

control-plane

!

bridge 5 protocol ieee

!

thanks

5 REPLIES
VIP Purple

Re: DLSW+ very very very Slow throughput

Hello,

can you do a ´show tcp´ on both routers and check for if both routers are ´path mtu capable´ ?

Router#sow tcp

|

|

Flags: higher precedence, retransmission timeout, path mtu capable

Also, what is the ´max data segment´ for both routers (same command):

Datagrams (max data segment is 1460 bytes)

You might want to try and set the ´ip tcp adjust-mss´ value to e.g. 1492 on your FastEthernet interfaces...

Regards,

GP

New Member

Re: DLSW+ very very very Slow throughput

Have you tried: bridge 5 route ip?

Thanks.

New Member

Re: DLSW+ very very very Slow throughput

Why:

bridge 5 route ip

?

We need to transport SNA and not ip traffic....

New Member

Re: DLSW+ very very very Slow throughput

are the as400 and the routers hard wired together or are they connected via hub or switch ?

Are there any errors on the ethernet interfaces ?

New Member

Re: DLSW+ very very very Slow throughput

No, there is any error in the interfaces...

AS400 and routers are connected through a crossover cable (I've used one of these to try AS400 to AS400 direct connection and all work properly...)

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