[j-nsp] J6350 Jumbo frame MTU and OSPF setting
Harris Hui
harris.hui at hk1.ibm.com
Sat Oct 2 00:21:01 EDT 2010
Thanks Jonathan for the good tips. :-)
- Harris
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|Jonathan Lassoff <jof at thejof.com> |
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| To: |
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|Harris Hui/Hong Kong/IBM at IBMHK |
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| Cc: |
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|juniper-nsp at puck.nether.net |
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| Date: |
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|10/02/2010 AM 12:14 |
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|Re: [j-nsp] J6350 Jumbo frame MTU and OSPF setting |
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While having an increased MTU across your WAN can improve throughout
greatly, I would suggest tuning your TCP stack for a "Long Fat Pipe", as
many operating systems are not designed to work well with high-throughput,
high-latency links.
There are some good tips here: http://fasterdata.es.net/
Cheers,
jof
On Sep 30, 2010 10:38 PM, "Harris Hui" <harris.hui at hk1.ibm.com>
wrote:
Dear all,
We had subscribed a private line circuit between 2 different data
center
for Data Backup and replication. The bandwidth of the private line is
100Mbps.
According to the provider, The Circuit is Built across their
Network as 2 STS1's or High Speed DS3's which equals 100meg.
Their GE port setting as follows.
MTU Size - 9600
Auto Negotiation - OFF
Remote Client Fail - Disabled.
The private circuit is connected directly to the fiber module of our
J6350
Services router at each Data Center. The Circuit is up and running
but when
we perform some TCP throughput test, we only get ~3Mbps for a Single
TCP
session with iPerf and the latency between two data center across the
private circuit is ~80ms.
I am trying to configure our J6350 fiber interface to MTU 9192 to get
a
better TCP throughput. However, I can only able to configure the MTU
size
below 1500, when I configure the MTU to 9192 and commit the changes,
it
still shows MTU 1500 on the physical interface.
Do you have any experience on using Jumbo frame MTU size on the
J6350? We
are also running OSPF across the private circuit, is JUNOS support
"OSPF
ignore-mtu" like cisco?
Please advise.
Fiber module
================================================
FPC 3 REV 18 750-013599 AAAH7361 FPC
PIC 0 1x GE SFP
Xcvr 0 REV 02 740-011614 PG336CS SFP-LX10
show interfaces ge-3/0/0
speed 1g;
mtu 1400;
link-mode full-duplex;
gigether-options {
no-auto-negotiation;
}
unit 0 {
family inet {
address xxx.xxx.xxx.253/30;
}
}
harris at J6350# run show interfaces ge-3/0/0
Physical interface: ge-3/0/0, Enabled, Physical link is Up
Interface index: 152, SNMP ifIndex: 184
Link-level type: Ethernet, MTU: 1400, Speed: 1000mbps, BPDU Error:
None,
MAC-REWRITE Error: None, Loopback: Disabled,
Source filtering: Disabled, Flow control: Enabled, Auto-negotiation:
Disabled, Remote fault: Online
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Current address: b0:c6:9a:87:35:36, Hardware address:
b0:c6:9a:87:35:36
Last flapped : 2010-09-27 02:32:24 UTC (4d 02:29 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Active alarms : None
Active defects : None
show interfaces ge-3/0/0
speed 1g;
mtu 9192;
link-mode full-duplex;
gigether-options {
no-auto-negotiation;
}
unit 0 {
family inet {
address xxx.xxx.xxx.253/30;
}
}
run show interfaces ge-3/0/0
Physical interface: ge-3/0/0, Enabled, Physical link is Up
Interface index: 152, SNMP ifIndex: 184
Link-level type: Ethernet, MTU: 1514, Speed: 1000mbps, BPDU Error:
None,
MAC-REWRITE Error: None, Loopback: Disabled,
Source filtering: Disabled, Flow control: Enabled, Auto-negotiation:
Disabled, Remote fault: Online
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Current address: b0:c6:9a:87:35:36, Hardware address:
b0:c6:9a:87:35:36
Last flapped : 2010-09-27 02:32:24 UTC (4d 02:35 ago)
Input rate : 0 bps (0 pps)
Output rate : 1192 bps (2 pps)
Active alarms : None
Active defects : None
Thanks
Harris
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