Cisco Switching/Routing :: 2960-S With GLC-FE-100FX Fiber Modules - Packet Loss

Apr 19, 2013

I have two 2960-s switches with GLC-FE-100FX fibre modules in and I am seeing packet loss over the link that is connected to the modules. When the interface is shutdown and brought back up it always comes up in half duplex even thought it is set to full in the config. I've seen other posts where you have to use the command no duplex then full duplex to get it to come up int full duplex. This does appear to work when I do a show int it says its full duplex however I'm stil seeing 20 - 40% packet loss on the link which suggests to me there is still a speed/duplex issue. The device at the other end is a Cisco 7200 which is set to 100Full. If I plug a Cisco 2811 into the fibre link I get zero packet loss which suggests its a problem with the switch.
 
I have changed the modules and fibre cables which makes no difference. As I stated at the start I have two 2960's both are showing exactly the same issue. Details of the switch are below the SFP are cisco branded:

Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 28    WS-C2960S-24TS-L   12.2(55)SE5           C2960S-UNIVERSALK9-M
 
interface GigabitEthernet1/0/25
switchport trunk allowed vlan 380,382,384,386
switchport mode trunk
duplex full(code)

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Cisco Switching/Routing :: 10 GB Fiber Modules For 3750G And 3750X

Apr 29, 2013

I am working on a project to connect 2 switch stacks via 10 Gb fiber.  I am told that the 3750Xs do not natively receive the 10 GB SFPs.  What part numbers do i need to order to make this work?  Is there any IOS image requirements?

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Mar 20, 2012

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I have a 24 port 2960-S that is not communicating with a 2960-LST that it is directly connected to over fiber.  The link is up on the LST but will not come up on the -S.  What command should I use to bring up this link?  I have tried no shut from the (Config-if)# prompt.         

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Dec 12, 2011

Is there a chart to show what modules will fit what swithches for fiber applications ex 2950 and 3560 switches

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Cisco WAN :: 2960 Buffers (drops / Packet Loss Due To Micro-bursts)?

Dec 21, 2011

Have a pair of 2960's in a stack, one port(trunk) connects to another DC and we are seeing ~5% packet-loss and large output drops to this DC.

#sh interfaces gigabitEthernet 1/0/17 counters errors

Port        Align-Err     FCS-Err    Xmit-Err     Rcv-Err  UnderSize  OutDiscards
Gi1/0/17            0           0           0           0          0       182867
GigabitEthernet1/0/17 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is a0cf.5b87.ec11 (bia a0cf.5b87.ec11)
  Description: QinQ_to_DC2

[code]....

As you can see, 30sec rate isnt excessive, but as the drops are outdiscards it would appear we are getting hit by the small buffers/microburst issue.
 
 Gi1/0/17 is mapped to asic 0/20
Gi1/0/17  17   17   17   0/20 1    17   17   local     Yes     Yes

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May 22, 2013

We have a site were we have a 887 cisco hsiung a GRE tunnel
 
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ping
Protocol [ip]:
Target IP address: 10.9.93.22

[Code].....
 
replicated the setup exatly in our lab  and it works 100% with exactly the same config.

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Cisco Switching/Routing :: Packet Loss With LACP 3560E

Mar 11, 2013

I have a cisco 3560E switch setup with LACP, when using LACP i receive alot of packet loss / output drops
 
When a ping from the server behind LACP:
--- google.com ping statistics ---
44 packets transmitted, 39 received, 11% packet loss, time 42990ms
 
what would cause this packet loss with lacp?
 
some output from the switch:
 
Port-channel12 is up, line protocol is up (connected)
Hardware is EtherChannel, address is d0d0.fd58.7390 (bia d0d0.fd58.7390)
Description: LACP-PORT

[Code]....

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Oct 2, 2011

we have a 6509 with ios 12.2.33SXJ
 
we have 2 WS-X6516-GE-TX, WS-X6516A-GBIC, and a WS-X6748-GE-TX with a WS-F6700-CFC daughtercard
 
our sup is a WS-SUP720-3B
 
we are experiencing packet loss for everything connected in the WS-X6748-GE-TX blade, right now we dont have any production device in that blade due to the packet loss we are experiencing.
 
this switch was running hybrid  before it is now running native ios, however I can't recall if we didn't have that packet loss before. do i need to update a firmware of the card or daughtercard (if this is possible, can't say i've done it before).

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Mar 26, 2012

I have a Cisco 2960S stack and I'd like to tune the timers so that packet loss is minimal if a switch fails.

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Apr 11, 2012

I have a Cisco 2960S stack and I'd like to tune the timers so that packet loss is minimal if a switch fails.To simulate a failed switch I have reloaded it while running a continuous ping to a management address on the stack's SVI: [code] As I see the same results when a ping is directed through the single switch (switched), and through the firewall (routed), I'm inclined to think that this is due to the stack failover timers on the Catalyst 2960S.Is it possible to change the stack failover timers (i.e hold down, failover etc), to speed up the failover process?

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Cisco Switching/Routing :: 6509 Monitoring Session Experiencing A Large Packet Loss

Aug 16, 2012

I have been searching the message boards and wasn't having much luck. I am running some monitoring sessions on my 6509 and on the VLAN I am monitoring, I am experiencing a really large packet loss.  If we hook up a laptop to the destination port and run wireshark we are seeing between 80% and 90% packet loss.  I dont see the packet loss on the show port command, but I do on the show int vlan command.
 
The config is as follows:
 
Session 2
---------
Type                   : Local Session
Source VLANs           :
RX Only            : 500

[Code].....

I was doing some reading on Egress vs Ingress and I am wondering if the Egress SPAN replication state could be causing the packet loss that we are seeing or does the ingress & learn command override that?

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Cisco Switching/Routing :: Fiber Connection Between Two 2960 Switches?

Mar 22, 2012

Company I work for just moved into a new location.  We have two data closets which are patched as independent entities, with no Ethernet tie connection. These closets are roughly 100 feet apart. 
 
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Oct 30, 2011

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May 25, 2013

I need to connect 4 Floor Building with 4 Cisco 2960 - 48 ports switch each other and it needs to be through a fiber. So all PCs connected to each switch would reach the LAN/WAN from the other switch. (attached is the image here with)
 
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My simple question is:
 
1. What cable / patch code I have to use = Single-mode or Multimode? ( distance for each switch will not more then 25 mts)

2. Do I have to use SFP or SFP+ module?

3. What kind of SFP/SFP+ module I have to use = Single-mode or Multimode?

4. What kind of connector should patch code have = LC / SC or ?

5. How to connect each switch with redundancy like ...each switch should be interconnected with each other or I have to choose Cisco 3750G which has more then 2  SFP ports (option#1 & opetion#2 = attached here with) =

Best practice for connecting cisco switches over fiber.

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Jan 6, 2012

below is the current config of link that is already up. I need to add another fiber redundant link between 6509 and 2960 stack. How to work on config Spanning side by not taking 6509 down after the change. 6509 is in distribution.
 
---------------X-ALPHA-IDF-1FORMS-2960S-0# (SIDE)
!interface GigabitEthernet1/0/52description X-ALPHA-F-6509-0 uplinkswitchport trunk native vlan 18switchport mode trunksrr-queue bandwidth share 1 50 30 19priority-queue out mls qos trust dscpmacro description cisco-routerauto qos trust spanning-tree portfast disablespanning-tree guard loopip dhcp snooping trust!
 
-----------------X-ALPHA-F-6509-0# (SIDE)
!interface GigabitEthernet3/10description 1st floor POC2 Forms IDFswitchportswitchport trunk encapsulation dot1qswitchport trunk native vlan 18switchport mode trunkno ip addressmls qos trust dscpspanning-tree guard loop!

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Oct 15, 2012

I want to connect a Cisco small business switch (sf302-8) to a Cisco catalyst 2960S over a multi mode fiber. The transceiver I am using in the catalyst is a GLC-SX-MM. I presume in the SF302, I will have to use a MGBSX1. My question is "are these transceiver compatible with each other and if not, is there a transceiver that will suit both pieces of hardware?

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Jan 16, 2012

I had a strange issue yesterday when onsite installing a new access switch.Port capacity full on a two switch stack of 3750 x48 PS switches (WS-C3750- 48PS-E)- New 2960 x48 PS - WS-C2960S-48FPS-L racked, with the plan of using it just as an edge switch via SFP Stacking cable.Setup the two connecting ports with simple initial config: - switchport mode trunk- no encapsulation option on the 2960, default dot1q- dot1q set on 3750 port- no shut on both sides.Connected the SFP Stacking cable but it didnt work:- %PHY-4-SFP_NOT_SUPPORTED: The SFP in Gi1/0/1 is not supported
 
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Jan 10, 2012

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Oct 9, 2012

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May 14, 2012

Does GLC-GE-100FX SFP is supported on the Cisco Catalyst 4928? Have tried the below link but it doesn't mention the 4900 series switches. url...

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May 21, 2012

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Apr 18, 2012

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Feb 19, 2013

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Dec 13, 2012

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Feb 12, 2013

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Oct 27, 2011

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