. Bandwidth Threshold on Cisco 3750

Does anyone know if at layer 3 an interface has a limit ?

I have been told that even thought our WS-C3750V2-48PS-S  switch has 1GB ports that we can expect much lower bandwidth throughput on the ports if we are using layer 3 on those ports

I'm trying to find some documentation that explains this but nothing clear is coming up

All switches have a limit in layer 2 forwarding, usually expressed in Gbps or Mbps. It's sometimes called the backplane bandwidth.

Layer 3 switches also have a limit in routing, expressed in (IP) packets per second: Mpps.

For a routing device, routing a 16 byte ICMP 'ping' packet is the same effort as routing a 1450 byte TCP packet carrying HTTP. If you multiply your average packet size with this Mpps value, you get an average Mbps value that indicates your L3 performance.

Not sure about the 3750 (and it'll depend on the exact model), but from memory even the 3550-48 had the horsepower to do layer3 at 1Gbps with 800byte packets; and compared to that, even a first generation WS-C3750X-24T-L  is a monster.

Cisco 3750 trunks

I am currently replacing our backbone switches (2 x 3560's) linked together via

trunked ether channels.

The user switches (2960's) connect to each 3560 using their 2 x 1GB trunked

Ports.

Install a stack of (3 x WS-C3750V2-24TS-S 's) as the main backbone and server connections.

Install a stack  of ( 2 x 3750's) for the user switches to connect to . This will

Connect to the 3750X's using multiple trunked ether channels (2 x to

each 3750X)

Then ether channel and trunk each user 2960' to each the 3750's (2 x to

each 3750) using the two 1GB Ethernet ports.

This allows us to use the 3750x's for the high bandwidth requirements and

The user switches are kept away from the main backbone.

Not sure if you've already purchased the 3750x's, but if you haven't, see if you can order the new 3850 switches. They are the successor the to 3750X. Some cool features are a 480G stack cable (versus 64G with the 3750x), have netflow enabled on ALL ports, up to 4 10G ports (2 10G ports on the 3750X), and has a built in wireless controller (activated via licensing, but if not needed... just don't license it).

Here's the kicker - it's the exact same list price as the 3750X.

If you have an "ordinary office" network load, there is no advantage in putting the the 2x 3750 for the client switches to connect to. Even with etherchannel, you will have multiple client connections sharing each 1GB link, from the 3750 switches to the 3750 X switches

If your budget permits, I've be tempted to do a stack of 5x 3750 X, if it doesn't then even a stack of 4x 3750 X with the client switches distributed across would be better, then you can utilize the stack bandwidth between the switches.

As you are stacking the 3750 X switches, the trunks to/from each trunked server and switch should be across two switches, for example port 1 on switch 1 and port 1 on switch 2 rather than ports 1 & 2 on switch 1.

Much as I like the WS-C3750X-48T-S  series of switches (and manage several stacks of them), for a L2 network, or even one with "light" L3 requirements (inter VLAN routing, but not BGP etc) I would usually specify the HP 5400zl series.

Cisco Netflow on 3750s

Can someone please tell me why I can't apply the following configuration to out cisco WS-C3750V2-48PS-S?

flow record FlowRecord1

 match ipv4 protocol

 match ipv4 source address

 match ipv4 destination address

 match transport source-port

 match transport destination-port

 match interface input

 collect interface output

 collect flow direction

 collect counter bytes

 collect counter packets

 collect timestamp sys-uptime first

The router show version is:

Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(55)SE5, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2012 by Cisco Systems, Inc.

Compiled Thu 09-Feb-12 18:14 by prod_rel_team

Image text-base: 0x00003000, data-base: 0x02800000

ROM: Bootstrap program is C3750E boot loader

BOOTLDR: C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(53r)SE2, RELEASE SOFTWARE (fc1)

MX-C3750-FL1-N uptime is 18 weeks, 4 days, 3 hours, 14 minutes

System returned to ROM by power-on

System restarted at 11:47:29 UTC Sat Apr 27 2013

System image file is "flash:/c3750e-universalk9-mz.122-55.SE5/c3750e-universalk9-mz.122-55.SE5.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

License Level: ipbase

License Type: Permanent

Next reload license Level: ipbase

ciscoWS-C3750V2-48PS-S Price (PowerPC405) processor (revision K0) with 262144K bytes of memory.

Processor board ID FDO1702Z2R1

Last reset from power-on

3 Virtual Ethernet interfaces

1 FastEthernet interface

208 Gigabit Ethernet interfaces

8 Ten Gigabit Ethernet interfaces

The password-recovery mechanism is enabled.

Cisco Catalyst 3750 Series configurations:

The Cisco Catalyst 3750-X Switch are an enterprise-class lines of stackable and standalone switches, respectively. These switches provide high availability, scalability, security, energy efficiency, and ease of operation with innovative features such as Cisco StackPower (available only on the Catalyst 3750-X), IEEE 802.3at Power over Ethernet Plus (PoE+) configurations, optional network modules, redundant power supplies, and Media Access Control Security (MACsec) features.

• Cisco Catalyst 3750G-24TS-24 Ethernet 10/100/1000 ports and four Small Form-Factor Pluggable (SFP) uplinks

• Cisco Catalyst 3750G-24T-24 Ethernet 10/100/1000 ports

• Cisco Catalyst 3750G-12S-12 Gigabit Ethernet SFP ports

• Cisco Catalyst 3750-48TS-48 Ethernet 10/100 ports and four SFP uplinks

• Cisco Catalyst 3750-24TS-24 Ethernet 10/100 ports and two SFP uplinks

• Cisco Catalyst 3750-48PS-48 Ethernet 10/100 ports with IEEE 802.3af and Cisco prestandard Power over Ethernet (PoE) and four SFP uplinks

• Cisco Catalyst 3750-24PS-24 Ethernet 10/100 ports with IEEE 802.3af and Cisco prestandard PoE and two SFP uplinks

• Cisco Catalyst 3750-24FS-24 100BASE-FX Ethernet ports and two SFP uplinks

• Cisco Catalyst 3750G-24TS-1U-24 Ethernet 10/100/1000 ports and four SFP uplinks, 1-rack unit (RU) height

• Cisco Catalyst 3750G-24PS-24 Ethernet 10/100/1000 ports with IEEE 802.3af and Cisco prestandard PoE and four SFP uplinks

• Cisco Catalyst 3750G-48TS-48 Ethernet 10/100/1000 ports and four SFP uplinks

• Cisco Catalyst 3750G-48PS-48 Ethernet 10/100/1000 ports with IEEE 802.3af and Cisco prestandard PoE and four SFP uplinks

• Cisco Catalyst 3750G-24WS-24 Ethernet 10/100/1000 ports with IEEE 802.3af, Cisco prestandard PoE and two SFP uplinks and an integrated wireless LAN controller

The Cisco Catalyst 3750 Series is available with either the IP Base image or the IP Services image. The IP Base image feature set includes advanced quality of service (QoS), rate-limiting, access control lists (ACLs), static routing, Routing Information Protocol (RIP) and EIGRP stub routing, capabilities. The IP Services image provides a richer set of enterprise-class features, including advanced hardware-based IPv6 and multicast routing.

Cisco 3750 - Fiber Connectivity

I am going to connect 6 WS-C3750V2-48PS-S switches on fiber for my 4 floor building,

below is my requirements:

All switches should get connected each other with redundant link (if one fiber cable is damaged second one should be available as a backup, so we will have the redundant link with each floors (not the redundant switch on each floor)

Kindly clarify my some queries as below:

1. My cable vendor shipped me single mode fiber cable for interconnecting the switches, so is this cable fine or do I have to go for mulimode fiber cable?

2. My cable vendor says ... you have to use SC-LC single mode Duplex adapter=is it correct? as cisco 3750X / 2960S SFP module will be compatible with LC connectors=True?

3. What SFP module I have to order if I have to go for 1G or 4G fiber = SC or LC? confused?

4. My cable vendor says ...you have to use SC/PC Pigtail OS2 PVC 1.5 m  + SC to LC fiber connector...so what does he exactly mean by this?,,, &.. what I understood is...my 2960S switch connect as below:

Cisco2960--->SFP--->---LC connector--->----fiber---------> SC/PC Pigtail <----------fiber------------ LC connector---< ----Cisco3750X   ( pls correct if I am wrong anywhere)

5. As 3750X comes with 12 fiber ports + 4 extra modules ports so all my 6 switches(6X2=12ports = pls refer to the attached net-diagram) will get connected with each switch with redundant link but can i use 4 extra ports to connect my 2 physical server with this switch = if yes...what I have to use to get it connected?

3. For 1G, 1000BASE-LX/LH (GLC-LH-SM). 10G would be SFP-10G-LR

4. if you are connecting back to back and this is within the same room I would say save some money and go with a long patch cable to connect the two directly. If there is a room or a floor between the two devices I would recommend a patch panel so that you can make changes in the future. This will accommodate hardware changes and moves.

5. Yes, you should be able to, but you still need to match the SFP type, or more specifically the frequency.

The above would be straight answers without throwing you any curves. But here's a slight curve. If none of the closets are further apart than 300M, you may be better off going with 50um MM fiber (OM3 or OM4). It's not so much that the fiber will save you money, but the price difference in SFP's is huge when it comes to 10G

As of today, list price is:

SFP-10G-LR=  3,995.00 (Single Mode)

SFP-10G-SR= 1,495.00 (Multi Mode)

When you multiply that out by the minimum 12 SFP's (just to get to your switches) that's a big difference - 47,940.00 for SM versus 17,940 for MM.

Use the links below to see the specs for different types of Cisco optics. When I say that you need to match the "type", I really mean the frequency. Frequency usually equates to a "type" like LR, SR, LX, LH, etc. Please excuse my use of the word type when referring to SFP's as it can be misleading.

For example, Cisco SFP-10G-SR has a frequency of 850nm, and Cisco FET-10G also has a frequency of 850nm. They do not have the same name, and do not serve the exact same purpose (the purposes are for a completely different topic), but they are compatible to communicate with each other directly because the frequency matches. This is a common pairing when using Nexus switches.

I would be willing to bet that the server fiber cards run at 850nm which means the SFP-10G-SR would be compatible and can use any of the listed fiber types within the distance limitations.

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/data_sheet_c78-455693.html

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html

For more Cisco WS-C3750X-48T-L information please click here

Cisco 3750 ASIC Errors?

I have a stack of 2 Cisco 3750 WS-C3750X-24T-L Price switches and am attempting to rollout QoS in the entire LAN using the AutoQoS template. This has so far been a success on other 2900, 3700 and 4900 series switches, however this particular switch stack is not happy when we apply the commands.

This is what we see on the logging console when we apply AutoQoS globally or even just to 1 interface attached to an IP Phone:

Mar 19 07:32:43.972: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 11 queue 1

Mar 19 07:32:43.989: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 0 queue 1

Mar 19 07:32:48.049: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 15 queue 1

Mar 19 07:32:48.133: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 1 queue 1

Mar 19 07:32:52.092: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 0 queue 1

Mar 19 07:32:52.235: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 3 queue 1

Mar 19 07:32:56.178: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 11 queue 1

Mar 19 07:32:56.278: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 4 queue 1

Mar 19 07:33:00.363: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 11 queue 1

Mar 19 07:33:00.330: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 5 queue 1

Mar 19 07:33:04.424: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 15 queue 1

Mar 19 07:33:04.382: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 9 queue 1

Mar 19 07:33:08.542: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 0 queue 1

Mar 19 07:33:08.450: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 10 queue 1

Mar 19 07:33:12.644: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 11 queue 1

Mar 19 07:33:12.502: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 16 queue 1

Mar 19 07:33:16.654: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 25 queue 1

Mar 19 07:33:20.697: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 26 queue 1

Mar 19 07:33:24.783: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 22 queue 1

Mar 19 07:33:28.834: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 23 queue 1

Mar 19 07:33:33.180: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 26 queue 1

Mar 19 07:33:37.282: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 27 queue 1

Mar 19 07:33:41.325: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 1 queue 1

Mar 19 07:33:45.368: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 0 queue 1

Mar 19 07:33:49.428: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 3 queue 1

Mar 19 07:33:53.480: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 5 queue 1

Mar 19 07:33:57.632: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 4 queue 1

Mar 19 07:34:01.667: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 9 queue 1

Mar 19 07:34:05.752: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 10 queue 1

Mar 19 07:34:09.787: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 16 queue 1

Mar 19 07:34:13.998: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 25 queue 1

Mar 19 07:34:18.058: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 1 port 26 queue 1

Mar 19 07:34:22.110: %SUPQ-4-PORT_QUEUE_STUCK: Port queue Stuck for asic 2 port 23 queue 1

We have swapped this stack with identical hardware using different stacking cables and we still see the same issue. These switches were purchased in batch.

TAC is the best idea for something like this.

Another thing to check is that the SDM templates match on all switches. If they don't match, autoQos can get screwy.

For more Cisco information please click here

http://www.3anetwork.com/cisco-ws-c3750x-24t-l-price_p101.html

unstable iOS on 3750's

Catalyst WS-C3750X-12S-S is next-generation energy-efficient Layer 3 Fast Ethernet stackable switches while 3750X is layer 3 GE switches. The Cisco Catalyst 3750 v2 Series consumes less power than its predecessors 3750. The 3750-X Series Switches are enterprise-class lines of stackable and standalone switches with StackWise Plus technology, they are the replacement of Cisco 3750G and 3750E switches. 3Anetworkcom keeps many stocks for 3750V2 and 3750X switches. Among all Cisco Catalyst 3750 switches, WS-C3750V2-24TS-S and WS-C3750X-24T-S are best selling models. 3Anetwork.com offers best Cisco 3750 Price, Cisco 3750V2 Price, Cisco 3750X Price, ship to worldwide.

We've had issues with our 9 switch 3750 stack crashing on 12.2(58)SE2 so tac said to upgrade to 15.0(2)SE4. We did that upgrade today and while at first it seemed to take, the stack eventually froze and after a few reboots we just couldn't log in via ssh or console. Console would complain about memory.

So we eventually broke the stack and one by one downgraded to 12.2(55)SE8. Was a painful process as the last 3 switches are 3750X POE so they had to do the microcode update again. We also took out a 3750v2 48 port since we consolidated some things.

So now all seems working with 3 3750X PoE and 5 3750v2 on 12.2(55)SE8. downgrading to that version of IOS?

One of the best releases of IOS started from 12.2(55)SE6 to SE8.  I strongly recommend 12.2(55)SE8 as it's very stable.  All my 3750/G/E/X are running this version without any issues or even crashes.

15.0(2)SE4 is also not bad.  The rest are plain rubbish.

For more Cisco WS-C3750V2-48PS-S information please click here