Cisco Switching/Routing :: Catalyst 2960S / Downgrade 10GB Twinax CU SFP Cable To 1GB?
Oct 30, 2012
specifying Cisco devices and I've made an error.I have 2 Catalyst 2960S switches (C2960S-24PS-L).Based on this snippet of web copy from the Cisco website:What's new for the Cisco Catalyst 2960-S Series Switches with LAN Base Software: # 10 and 1 Gigabit Ethernet uplink flexibility with Small Form-Factor Pluggable Plus (SFP+), providing business continuity and fast transition to 10 Gigabit Ethernet I bought a cable assembly "SFP-H10GB-CU3M" (3 meter copper twinax cable with 10GB SFPs on each end). Unfortunately, it appears after more careful reasearch that my specific model 2960S's are not directly compatible. , can I force these 10GB SFPs down to 1GB and get them to work with my switches or do I need to return and repurchase?
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Sep 4, 2012
I need to know if is possible to do a LACP using 2 x 10GB between 3750X and 2960S (WS-C2960S-48LPD-L) switches.
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Mar 3, 2013
I have a customer who is having some issues with 5m passive HP twinax cables, 537965-001, with a Chelsio 10G NIC. Aside from NIC driver issue, if NX-OS recognizes this SFP+, should it be expected to work in a 5020 running 4.2(1)N1(1)? Whether Cisco has certified passive HP twinax cables? I have included output to 'transceiver details' to a Cisco twinax and the HP (WL GORE) cables.
Nexus5020# show interface eth 1/7 transceiver details
Ethernet1/7
sfp is present
name is CISCO-MOLEX
type is SFP-H10GB-CU3M
[code]....
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Mar 24, 2012
can we connect ASA 5550 to Nexus 7K F2 module using twinax cable?
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Aug 8, 2012
Just I have upgraded some 2960S to IOS 15.0(2)SE from a IOS 15.0(1)SE3 and the catalyst don't switch any IPv6 traffic. Don't work any RA and also don't work any unicast IPv6 traffic from any interface. I can see some references to IPv6 changes in the FHS (First Hop Security) in the Release Notes, but no any reference to changes in the configuration.
The switches don't have any IPv6 specific configuration and the sdm is the default templata. Returning to 15.0(1)SE3 everything work ok.
On Catalyst 2960, and 3560E this IOS version seem to work fine with IPv6.
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Jun 20, 2012
i want upgrade my catalyst 2960S and 3560x at midnight, but i am worried about config loss. If i upgrade my switch throught web interface, will need I reconfigure the switch?
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Dec 1, 2010
I have a new problem with Catalyst 2960S. We have four switch in a stack and now I get the message:
“%PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 37, class 14, max_msg 32, total throttled 73968 (hostname1-2)”
Traceback= 13A686C 160862C 160E0B4 15E2088 184FD48 18467B8
sh switch de
Switch/Stack Mac Address : 68bd.abc9.0000
H/W Current
[Code]....
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Nov 26, 2011
we have Catalysts 2960S for switching in our Wireless high capacity backbone network. As agregation switch we are using 3560x.
I just need to know, if are these 2960S good solution for igmp snooping for whole IPTV stream. It put only a range from backbone and put out on another port. But just specified multicast addresses.
Imput will be 239.128.0.10 to 239.128.0.20 on Gi 0/1,Output wil be 239.128.0.10 - 15 on Gi 0/24
IPTV will be separated on different VLAN for eg VLAN 20,Is needed any priorization configured od switches?,The capacity for IPTV is around 500 mbps
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Jan 3, 2013
I recently tried to manually format the flash on a model WS-2960S-48TS-L switch running IOS version 15.0(2)SE. While executing the operation I got the following error - mifs[8]: Failed to create superblock %Error formatting flash (I/O error).As a result the flash is no longer accessible by the switch. I spoke with Cisco and they indicated that a switch reload would remount the flash and make it accessable again but the .bin file would need to be reloaded using the xModem recovery procedure (what a pain).The next IOS version 15.0(2)SE1 will supposedly fix this bug but it has not been released yet. In the meantime if you are running 15.0(2)SE you may want to hold off performing a "format flash:" function on a 2960S.
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Nov 5, 2011
We are using catalyst 2960S Lan Base IOS on Radio towers. We just bought 50 Accest points, thas are GPS synchronized. Problem is the APs need to be connected on L2-mac betwen each other. But at this time we are using port isolation on each switch (tower) by protected port function to isolate clients from each other.
My question is, is possible to specifi a Mac addresses in specific vlan thats can comunicate betwen protected ports? On tower is one Master unit and others are slave. I thing there is only 1 dirrection comunication - from master to slave.
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Sep 27, 2012
I just bought a Catalyst 2960S to test out the feature "Port-Based Address Allocation" which is required for our factory. I followed the instruction from Cisco IOS and did all the steps but I could not get it to work, my network client did not received the expected IP address that I configured.
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Jan 28, 2012
Multicast is not working between our two datacenter, we have catalyst 2960S (two stacked) as the internal lan switch, and catalyst 3560E as the external switch, same configuration for both datacenters.The two sites are connected using metro, the external switch (3560) is doing qinq and encapsulate the data from the internal switch with the metro vlan (611).
IGMP snooping is disabled for all switches, although we prefer to enable it for the internal switches.For each datacenter there is a different firewall which also act as the router, we are using fortigate as the firewall.Following is the important configuration section:
Port 43 in the internal switch is connected to the external switch (both sites):
interface GigabitEthernet1/0/43
switchport mode trunk
load-interval 30
Port 3 in the external switch connected to the internal switch (both sites):
interface GigabitEthernet0/3
switchport access vlan 611
switchport mode dot1q-tunnel
no cdp enable
no cdp tlv server-location
no cdp tlv app
Port 8 on the external switch connected to the metro link (both sites) vlan 350 is the internet and 611 is the metro:
interface GigabitEthernet0/8
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 350,611
switchport mode trunk
vlan 611 on external switch:
interface Vlan611
ip address 192.168.168.2 255.255.255.0
no ip route-cache
no ip mroute-cache
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Aug 30, 2012
I am administering a Catalyst 2960S switch and I would like to connect several computers to it. Some of those each have a static IP address. For a few of them, I would like the switch to dynamically assign an IP address to them via DHCP. Is the switch capable of doing this? If so, how can I do it? I tried looking through Cisco Network Assistant and I couldn't find it. Some web pages have suggested I telnet into the switch and issue commands like "ip dhcp ?" to see what commands are possible. I can telnet in and if I type but I get an "Unrecognized command" for both "ip ?" and "ip dhcp ?". This makes me think I'm reading the wrong web pages. I did come across the term "DHCP snooping". It seems relevant, but very difficult for me to grasp.
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May 6, 2013
after upgrading about 35 Catalyst 2960 and Catalyst 2960S to IOS 15.0(2)SE2, we experience a memory leak on several switches. After some days / weeks the switches are not accessible via Console/Telnet/SSH/Web any more. Only SNMP seems to work properly.Attached users do not experience any decrease in service.
Trying to connect to the console, we get following error message:
"% Low on memory; try again later"
The only (temporary) solution is to reboot the switch. The behavior is similar to Bug CSCts52797.With regards to the Bug notes this bug should only affect Catalyst 2960 with 64MB of RAM and should already be solved with IOS 15.0(2)SE2.
We experience the erroneous behavior with
-WS-C2960-48TC-S running IOS 15.0(2)SE2
-WS-C2960S-48LPS-L running IOS 15.0(2)SE2
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Aug 9, 2012
I'm connecting the two devices above and I need an LC to SC fiber cable. It should be pretty simple but I've seen two different types of LC/SC cables - one is 8.3/125 and one is 62.5/125. I believe the 62.5 is an older cable type but when looking at the detail sheets for each of the SFPs I see that both of these support a 62.5 or 50 micron core size.
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May 5, 2013
Can you use twinax cables to connect two Nexus 7010 switches for VPC peer link? They would connect on F2 modules and have Sup2 on the chassis.
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Jul 22, 2012
I just recieved a new 3560-x switch with the C3KX-PWR-715WAC. It looks like Cisco is now using a different AC power cable. Not the StackPower connector, but the standard AC power cable. My data center is setup to supply 208v using C13 power cables. The switch uses a C15 power cable, and comes with a standard NEMA 5 to C13 power cable. Does Cisco make, or officially support a C13 to C15 power cable? Can I still use a 208v power supply with these switches?
I'm using an APC AP8861 power distribution unit, see [URL]
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Apr 25, 2013
I have two Cisco 48 port Catalyst 2960-S series SI. Instead of buying the pricy stack modules can I only use the SFP+cable to connect them as stack? which type of SFP+cable should I buy? do I need any license to use those SFP ports?
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Feb 11, 2013
I am relocating UPS units and will need to buy longer power cables to extend from our 4506 and 4510 to the new location.I think I am looking at 15 to 20 feet but I am going to confirm. Is it okay to use longer cables?
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Dec 12, 2012
I planed to configure a new catalyst 2960 switch with console cable.
During the boot, all seems ok. but from my terminal client, I can't have access to configuration mode.Keyboard or Terminal client is not sending commands to the switch.
The terminal is blocked on this line Compiled Tue 28-Sep-10 13:44 by prod_rel_team.what can I do to get access to the switch? [code]
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Oct 5, 2011
We've got a CiscoWorks (LMS 3.1) with CV 6.1.8 and it doesn´t display the new installed 10Gb (X2-10Gb-SR=) modules in the Catlyst 6509E chassis and Catalyst 3750E, what can I do to fix it?
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Apr 9, 2013
one side Catalyst 6500 module with X2-10GB-SR= otherside WS-C2960S-48FPD-L.
is both end compatible with each other.
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Jan 31, 2012
i will be buying 2 x 3750-E and will connect our server with 10G to the x2 port of 3750. is X2-10gb-SR compatible with this? do i need any converter module?
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Nov 15, 2011
I'm looking at provisioning a Catalyst 4500 with a WS-X4712-SFP+E module to allow for future 10Gb connectivity via 10Gb SFP+ interfaces. These cards are backwards compatible with standard 1Gb SFP interfaces but I'm wondering about the other way around; ie. can you populate these blades with 10Gb SFP+ interfaces when they connect to Catalysts with only 1Gb SFP interfaces at the other end?
The data sheets don't really explain this. It seems pointless getting 10Gb SFP+ interfaces for the 4500 when it's only 1Gb at the access layer end, but these access switches will be replaced in the near future (~12 months) and if the 10Gb SFP+ interfaces support connections at 1Gb speeds upfront, it would mean I could retain these interfaces when the access switches upgrade to 10Gb connectivity capabilities down the track. Does the 10Gb SFP+ interfaces are compatible with 1Gb SFP's or only other 10Gb SFP+ interfaces?
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Jan 15, 2012
Created two 6509s as VSS with just one 10gb connection?I know it is recommended to use both the 10gb connections on the sup-720 from below configuration guide
"
Information about VSL Topology
#
A VSS contains two chassis that communicate using the VSL, which is a special port group. Configure both of the 10-Gigabit Ethernet ports on the supervisor engines as VSL ports.
"
But will the VSS come up if I use just the one?
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May 12, 2012
I have 4900M with X2-10G-LX4I need to have a link from it to 3560X GLC-SX-MM using MM Fiber Patch Cord.any configuration required in 4900M to change the speed of X2-10GB-LX4 to 1GB ?
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Feb 7, 2012
Does the X2-10GB-T copper transceiver is supported on the WS-X45-SUP6L supervisor?
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May 22, 2012
I have two 3750 stacks that are currently connected using two1GB fiber connections in an etherchannel. I now added new switches to each stack with 10GB modules in them. We would like to bring up the 10GB connection, but still have one of the 1GB lines as a backup, or even the whole etherchannel. Is there a way for us to make the 10GB the main and the 1GB the standby?
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Dec 14, 2011
For a simple 4x sites design for backup consolidation (3x sites connected to one central site), does the design in the attached JPEG make sense and is the configuration achievable using the specified parts?
Brief Explanation:
- Each site is to have servers with 2x 10Gb/s Ethernet (both teamed/bonded/etc) and one NIC on each of the 2x switches in the site (if possible). Each site will also have 2x Cisco Nexus 5596UP Switch (though the P version may be used instead of the UP).
- Two of the sites are within 10KM of the central site
- The last site is about 35KM from the central site
- It is required to have a minimum bandwidth of 10Gb/s between any site and the central site
- I have specified 10Gb/s LW SFP+ and 10Gb/s LW SFP+ (for the 2x 10KM and 1x 35KM sites)
- are there any special licenses needed?
- as asked before, can such a "simple" design work as-is?
- what sort of single-mode fiber would fit the bill (especially for the 40KM link) - 9nm?
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May 1, 2012
We are having troubles getting a 10Gig interface to come up with a carrier... it shows down down.We are using X2-10GB-LR on a 6500 and SM fiber, distance to carrier hand off is about 90 feet.
According to: [URL]
The receiver power on a X2-10GB-LRis
Max
0.5
Min
-14.4
Our carrier is sending at +5db. Currently the interface is down.
My question is; would the interface even come up if it is receiving a powerful signal?
Here is DOM output for our interface.
show interfaces transceiver detail
Optical High Alarm High Warn Low Warn Low Alarm
Transmit Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
[Code]....
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Feb 2, 2012
After trying to downgrade a Nexus 7K from 5.2.1 to 5.1.5 by updating the boot & kickstart boot statements and reloading, I'm now stuck in an endless cycle of reloading. See below:
Is there a break sequence which will allow me to modify the boot statement back to the original via ROMMON or something similar?
[code]....
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Mar 22, 2012
Since upgrading a 3750x switch stack to version 15, PC's on the network do not get a DHCP lease. The only way to get them to work is disable and re-enable the NIC card.
Downgrading the IOS does not downgrade the microcode on the switches.Is there anyway to downgrade the microcode?
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Jul 11, 2012
Could I connect a WS-G5484 (4500) to X2-10GB-SR (6500)?These two transceivers modules have 850 wavelenght, so it should work right?
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