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sdlc configuration

amenash123
Level 1
Level 1

hi

i have a RS232 device that connect to 2600 router and the router configuration is:

interface Serial0/1

no ip address

encapsulation sdlc

no keepalive

nrzi-encoding

clockrate 19200

sdlc role primary

sdlc vmac 4000.0018.6600

sdlc address A5

sdlc xid A5 05D018A5

sdlc partner 6600.0000.9918 A5

sdlc line-speed 19200

sdlc dlsw default

This is a cisco router with DLSW configuration and i have a problem with the work speed of the device,any operations took many time more than the same device how connect to ibm router,why that maybee configuration or ios.

please answer me.

it very urgent.

Thanks.

6 Replies 6

Hello,

how are your dlsw peers defined ? Can you post the full configuration of the router ? Also, can you check if it makes a difference if you configure 'bandwidth 19200' on the serial interface ?

Regards,

GP

hostname RS444

!

logging buffered 10000 debugging

aaa new-model

aaa authentication login default group tacacs+ local

aaa authentication login no_tacacs local enable

aaa authentication enable default group tacacs+ enable

aaa accounting exec default start-stop group tacacs+

aaa accounting commands 15 default start-stop group tacacs+

aaa accounting network default start-stop group tacacs+

aaa accounting connection default start-stop group tacacs+

enable secret 5 $1$a2Ru$r.Aq8LBi30U4o/wrwPDVg/

!

username service privilege 15 password 7 05051C043666666

username Center-2 password 0 rtaui

memory-size iomem 15

ip subnet-zero

no ip source-route

ip cef

!

!

ip telnet hidden addresses

no ip domain-lookup

!

no ip bootp server

isdn switch-type basic-net3

call rsvp-sync

!

dlsw local-peer peer-id 197.12.118.51

dlsw remote-peer 0 tcp 10.20.0.242

dlsw remote-peer 0 tcp 198.17.97.51 backup-peer 10.20.0.242 linger 0

dlsw icannotreach sap E0 F0

dlsw bridge-group 10

!

interface Loopback0

ip address 197.12.118.51 255.255.255.255

!

interface Loopback1

no ip address

!

interface FastEthernet0/0

ip address 212.16.184.51 255.255.255.0

speed 100

full-duplex

bridge-group 10

!

interface Serial0/0

description conected to 2621 dlsw #292 line code 132825555 ***

bandwidth 128

backup delay 5 5

backup interface Dialer1

ip address 192.163.148.2 255.255.255.0

encapsulation ppp

fair-queue

!

interface BRI0/0

no ip address

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-net3

ppp authentication chap

ppp multilink

!

interface FastEthernet0/1

no ip address

speed 100

full-duplex

!

interface Serial0/1

no ip address

encapsulation sdlc

no keepalive

nrzi-encoding

clockrate 19200

sdlc role primary

sdlc vmac 4000.0018.6600

sdlc N1 35216

sdlc address A5

sdlc xid A5 05D018A5

sdlc partner 6600.0000.9918 A5

sdlc line-speed 19200

sdlc dlsw default

!

interface Dialer1

ip address 2.2.2.2 255.255.255.252

encapsulation ppp

dialer pool 1

dialer remote-name Center-2

dialer idle-timeout 121

dialer string 6233305

dialer load-threshold 1 either

dialer-group 1

ppp authentication chap

ppp multilink

!

router rip

version 2

redistribute connected

passive-interface default

no passive-interface Serial0/0

no passive-interface BRI0/0

no passive-interface Dialer1

network 2.0.0.0

network 192.168.118.0

network 197.12.118.0

network 212.16.184.0

no auto-summary

!

ip classless

ip route 0.0.0.0 0.0.0.0 192.163.148.1

ip route 0.0.0.0 0.0.0.0 Dialer1 40

ip tacacs source-interface Loopback0

no ip http server

!

logging source-interface Loopback0

logging 10.89.55.230

access-list 1300 permit 10.19.99.230

access-list 1300 permit 10.19.99.231

access-list 1300 permit 10.16.48.236

access-list 101 permit ip 0.0.0.240 255.255.255.0 any

access-list 101 permit ip 10.10.0.0 0.0.0.255 any

access-list 101 permit ip 10.200.0.0 0.0.0.255 any

access-list 101 permit ip 10.19.99.0 0.0.0.255 any

access-list 101 permit ip 10.209.99.0 0.0.0.255 any

access-list 101 permit ip 10.19.199.0 0.0.0.255 any

access-list 101 permit ip host 12.0.0.3 any

access-list 101 permit ip 10.0.0.0 0.255.255.255 any

access-list 101 remark ***Permit_Telnet***

access-list 101 permit ip host 10.20.0.242 any

dialer-list 1 protocol ip permit

tacacs-server host 10.89.49.225 single-connection

no tacacs-server directed-request

bridge 10 protocol ieee

!

dial-peer cor custom

!

!

alias exec ct conf t

alias exec siib sh ip inter brief

!

line con 0

privilege level 15

logging synchronous

login authentication no_tacacs

line aux 0

line vty 0 4

logging synchronous

!

end

Hello,

you could try to set the MTU size on the serial interface to 4400, this is what e.g. the IBM 2212 uses (while Cisco defaults to 1500):

interface Serial0/1

mtu 4400

Also, can you do a 'sdlc test serial 0/1 A5', this will send 10 test frames to the other side (A5) and tell you if there are errors...

Also, make sure that whatever is connected to your FastEthernet0/0 interface has the same fixed speed and duplex setting (100/Full)...

Regards,

GP

the mtu 4400 not resolve the problem.

do you have another idea?

thanks.

Menash

I notice that the link from this router to its peer appears to be 128 K. Also that you are running DLSW on the Ethernet, along with IP traffic. I wonder if the 128K link is a bottleneck.

I also wonder if the load on this router is the same as the load on the IBM router. When the SDLC device was connected to the IBM router was the IBM router also doing DLSW on the Ethernet and was its uplink also 128 K?

I also notice that there are two access lists defined on the router (101 and 1300) which are not assigned to anything in this config. Where did they come from and what are they doing?

HTH

Rick

HTH

Rick

Hello,

following up on Rick's suggestion that the bandwidth might be a bottleneck, you might want to try and allow only SNA traffic, and not send any NetBIOS packets. You can configure this as following:

access-list 200 permit 0x0000 0x0d0d

dlsw remote-peer 0 tcp 10.20.0.242 lsap-output-list 200

Also, I did some more research on the default MTU size on the IBM 2212, it is 2048, you might want to try that on your serial interface:

interface Serial0/1

mtu 2048

Regards,

GP

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