08-06-2003 10:06 AM - edited 03-02-2019 09:24 AM
This is the issue: two 3640 routers bridged over a DS3 (45MB), hssi and atm interfaces, utilization on the interfaces never goes over 40-42 % and after performing large data transfer still never goes above 40-42% utilization. Does anybody have any ideas or similar issues, here is the configs:
Building configuration...
Current configuration : 4535 bytes
!
! Last configuration change at 13:41:14 EDT Wed Aug 6 2003
! NVRAM config last updated at 15:29:12 EDT Tue Aug 5 2003
!
version 12.2
no parser cache
no service single-slot-reload-enable
service timestamps debug datetime localtime show-timezone
service timestamps log datetime localtime show-timezone
service password-encryption
no service dhcp
!
hostname d-ds3
!
logging buffered 4096 debugging
logging rate-limit console 10 except errors
no logging console
no logging monitor
enable secret xxxxx
!
clock timezone EST -5
clock summer-time EDT recurring
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
no ip dhcp-client network-discovery
!
class-map match-any Exchange
match access-group 110
!
!
policy-map QoS-Policy
class Exchange
priority 33500
class class-default
fair-queue
!
bridge irb
!
!
!
interface FastEthernet0/0
no ip address
no ip redirects
speed 100
full-duplex
bridge-group 1
!
interface FastEthernet0/1
ip address 172.21.1.4 255.255.255.0
no ip redirects
speed 100
full-duplex
!
interface Hssi2/0
no ip address
no ip redirects
encapsulation ppp
crc 32
bridge-group 1
!
interface BVI1
ip address 172.18.2.23 255.255.0.0
no ip redirects
!
router eigrp 11453 network 172.18.0.0
network 172.21.0.0
distribute-list 20 out
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.21.1.1
no ip http server
!
no logging trap
access-list 20 deny any
access-list 110 permit ip 172.18.0.0 0.0.255.255 host 172.18.1.86
access-list 110 deny ip any any
snmp-server community xxxxxx
snmp-server chassis-id d-DS3
snmp-server enable traps snmp linkdown linkup coldstart warmstart
snmp-server enable traps config
snmp-server enable traps entity
snmp-server enable traps envmon
snmp-server enable traps syslog
snmp-server host 172.22.x.x
snmp-server host 172.22.x.x
bridge 1 protocol ieee
bridge 1 route ip
bridge 1 aging-time 14400
banner motd ^C
*****************************************************************************
* *
* WAN router *
* *
* This is a private system operated for and * *
* Authorization * *
* Use by unauthorized persons is prohibited. *
* *
*****************************************************************************
^C
!
line con 0
line aux 0
password xxxxx
modem InOut
transport input all
line vty 0 4
exec-timeout 120 0
password xxxxx
login
!
!
end
Any help is appreciated
08-06-2003 10:21 AM
I am not sure what you are asking , if you want a more accurate picture of the load on an interface you can configure load-interval 30 on the interface it will calculate the load over a 30 sec time period as opposed to 5 minute which is default .
08-06-2003 10:26 AM
What I mean is that I'm not getting a full 45 MB bandwidth on the link, only 40% of that, even when large amounts of data are being transferred, packets instead are being dropped, thank you.
08-06-2003 10:31 AM
Are you sure this a full DS3 or is it a fractional ? Is the other end the same size pipe? Perhaps your serivce provider is policing you at 20Mb
08-06-2003 10:38 AM
Yes, it is full DS3, provider just tested it a week ago and was able to push 44.7 MB, One side is a ATM int and the other a hssi int, thank you.
08-06-2003 10:39 AM
what does the ATM config look like ?
08-06-2003 10:45 AM
Also I see you have LLQ configured but it is not applied anywhere was it applied ?
08-06-2003 11:02 AM
Sorry, no ATM, two hssi's (I'm working in two different issues)and the QOS policy was removed from all interfaces. Thanks again
08-06-2003 11:13 AM
how do you know you are getting drops ?
08-06-2003 01:45 PM
When we were getting a DS3 for the Internet Cisco told us the 3640 could not forward data at that rate (even though it had the interface) and sold us a 7204. That was not the HSSI you are using but it may be the same issue.
On the other hand, what are you using to transfer the file and how far is the link. You need two fast servers using a large tcp window and a good sliding window protocol (FTP) to take advantage of the speed. Typical NOS file copies are inefficient and combined with distance based latency can kill your performance.
08-06-2003 05:48 PM
I've pushed ~40Mbits/sec through a 2621 with full-sized packets, so I'd be surprised if a 3640 couldn't handle a full DS3. Things may chance if you introduce access-lists/NAT/routing protocols/etc into the picture, however, but CPU usage should be maxed in any case if the router is the bottleneck.
08-07-2003 05:42 AM
The two routers are about 50 miles away, there are several exchange servers running replication software across the DS3 link and it runs pretty slow, we tested the link by copying/pasting files between two different PC's but still was slow and utiliz never went pass 40 %, thanks to everyone for your ideas.
08-07-2003 05:06 PM
Try testing it with an application such as TTCP (Google for a Windows version if necessary) that is meant specifically to test link bandwidth. Windows file copies are about the worst possible way to test network bandwidth.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide