OS/2 Filetransfer per NetBios over a 2Mbit Wan Link

[rloser]

Hi all,

my customer change from Token Ring to Ethernet since the change the netbios traffic performance fall from 230kbit/s throuput to 18kbit/s.

IP traffic is not be affected, IP runs with 230kbit/s.

We have an Ethernet-(Router1)-2MbitWAN-(Router2)-Ethernet connection, between the Ethernet goes an DLSW peer.

Netbios traffic (Filetranfer)goes from a OS/2 Client to a OS/2 Server.

Router1

source-bridge ring-group 67

dlsw local-peer peer-id 45.x.x.x promiscuous

dlsw bridge-group 1

dlsw prom-peer-defaults host-netbios-out

!

interface Loopback0

ip address x.x.x.x 255.255.255.255

!

interface FastEthernet0/0

bandwidth 100000

ip address x.x.x.x 255.255.255.0

duplex auto

speed auto

bridge-group 1

hold-queue 150 in

interface Serial2/3

bandwidth 2000

ip address x.x.x.x 255.255.255.0

down-when-looped

serial restart-delay 0

Router2

source-bridge ring-group 67

dlsw local-peer peer-id x.x.x.x

dlsw remote-peer 0 tcp x.x.x.x priority host-netbios-out

backup-peer x.x.x.x

dlsw bridge-group 1

interface Loopback0

ip address x.x.x.x 255.255.255.255

!

interface FastEthernet0/0

bandwidth 100000

ip address x.x.x.x 255.255.255.0

duplex auto

speed auto

bridge-group 1

hold-queue 150 in

!

interface Serial0/0

bandwidth 2000

backup delay 1 40

backup interface BRI1/0

ip address x.x.x.x 255.255.255.0

down-when-looped

Have somebody a idea and can help me

Thanks

Rainer

[rsissons]

Depending on your traffic profile, token ring can have a significant performance enhancement compared to ethernet since the frame sizes are much larger. You should try using the 'ip tcp path-mtu-discovery' to negotiate the largest frame size end to end. Also if you use the priority keyword, it must be specified at both ends.

[dixho]

I think that you need to find out the bottle neck. I suggest you to do the following:

1. use show TCP and find out if there are excessive retransmission

2. use show dlsw circuit and find out if there are any flow control indicator

3. use show llc and find out the state of the LLC2 circuit

If the above show commands do not give you any hint, you may need to take a sniffer trace to capture the llc2 session (either on the token ring side or ethernet side)