Asset ID:	1-72-1321082.1
Update Date:	2011-05-27
Keywords:

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Solution Type  Problem Resolution Sure

Solution  1321082.1 :   Sun Server T2000 Only Achieving 15mbs Over Gig Interface  

In this Document
  Symptoms
  Cause
  Solution
  References

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Created from <SR 3-3334524961>

Symptoms

Sun Server T2000 only achieving 15mbs over gig interface
When aggregating 4 1Gb ports via etherchannel the throughput in total was limited to 1Gbyte/Second

Cause

Switch line cards causing the issue: WS-X6148-GE-TX

From this document:
"http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a0080094714.shtml"

1.The WS-X6548-GE-TX, WS-X6548V-GE-TX, WS-X6148-GE-TX, and WS-X6148V-GE-TX modules have a limitation with EtherChannel. EtherChannel is supported on these modules for all configurations (10, 100, and 1000 Mbps speeds) but be aware of these cases of oversubscription when you configure these modules:
a.
On these modules there is a single 1-Gigabit Ethernet uplink from the port ASIC that supports eight ports. For EtherChannel, the data from all links in a bundle goes to the port ASIC, even though the data is destined for another link. This data consumes bandwidth in the 1-Gigabit Ethernet link. For these modules, the sum total of all data on an EtherChannel cannot exceed 1 Gigabit.

You receive a message on the maximum throughput when you add a port of this module to EtherChannel.

C6500> (enable) set port channel 3/5,4/5 mode on
Adding a WS-X6148-GE-TX port to a channel limits the channel's
bandwidth to a maximum of 1Gig throughput
Port(s) 3/5,4/5 channel mode set to on.
C6500> (enable)
b.
You can also run into the oversubscription problem if you have four WS-X6148-GE-TX or WS-X6148V-GE-TX modules that run at 100 Mbps with 48 EtherChannels, and each channel has 4 ports (1 port per module).

c.
If you use the Switch Fabric Module with the WS-X6548-GE-TX or WS-X6548V-GE-TX modules, that configuration avoids the oversubscription problem. The Switch Fabric Module interface filters and distributes the packets to the correct module per the EtherChannel bundle hash. But, you must have one port per module in the bundle. Once you have more than one port of a WS-X6548-GE-TX or WS-X6548V-GE-TX module in an EtherChannel bundle it starts to oversubscribe.

Note: With Catalyst OS software release 8.2(1), due to firmware enhancements, these oversubscription problems are no longer an issue with the WS-X6548-GE-TX and WS-X6548V-GE-TX modules.

Solution

Replace line cards WS-X6148-GE-TX
with  WS-X6516-GE-TX

References

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a0080094714.shtml

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