Cisco Switching/Routing :: 3750 - Gigabit Ports Not Working
May 1, 2013
I have two switches, WS-3750-24PS-S connected in two cabs via fiber. Patch panels at both ends with patch leads. Used tester to confirm end to end fiber connectivity. When plugged in, one switch lights up the other does nothing.
Ports are as follows:
interface GigabitEthernet1/0/2
switchport trunk encapsulation dot1q
switchport mode trunk
same at both ends. Tried both GI ports same result. swapped transceivers over and the same result, (one switch lit one not - the same switch in both cases). put both transceiver in each switch, (gi0/1-0/2 in a single switch). on the one that lights up in the original scenario we get link on both ports and they come up, on the other nothing happens. shut down both ports on the malfunctioning switch and no shut them, no change.
Show transceivers doesn't show transceivers on the malfunctioning switch, and no attempt is made to bring the ports up if the fiber is removed and replaced.
it is almost as though the two gb ports are kaput. Anything else I can try?
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Apr 18, 2012
I am trying to test the gigabit ports on a Cisco 2950 switch. 1000Base-SX. I have the internet or dhcp server connected to port 24 on the first switch and my pc hooked up to the (any) port on the second switch. Both switchs are connected with a fiberoptic cable with MTRJ connectors on either side.
Now when I use gi0/2 on both switchs all works fine. I get a dhcp address from the router on the other end of the first switch. but when ever I include gi0/1 on either end of the fiber optic cable neither of the ports will initialize (neither of the leds above the ports light up). I have deleted all the config files before booting up the switchs so they should have a default blank configuration.
When looking at the Http web page for the switch I dont see any issues with the port. what can I do to make sure these ports are working or can be configured?
I will not be able to post back any more information about the switch until next tuesday. Im off till then.
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Jun 4, 2012
Are all ports on Catalyst 4500X Gigabit/10-Gigabit or just the ports on 8-port module. We are looking at 4500X for campus distribution layer but need Gig ports to access switches for now and may year from now will be using 10G.
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Jan 27, 2012
I use one cisco 6506-e switch with modules (including two sup720-3B,one 6148-GE-TX,one 6724-SFP), and Thomson ViSE EM1000 encoder connect to 6148-GE-TX module with its two Gigibit RJ45 ports,Video picture can appear,but it isn't active.If connect to 6724-SFP module with GLC-T transceiver,It is OK. configure speed 1000 on the 6148 interface? configure full-duplex on the 6148 interface?
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Jan 28, 2012
According to the following Cisco webpage, cross-stack 10-Gigabit EtherChannel is possible on the 3750 with up to two 10-Gigabit modules, using LACP: url...However, the webpage doesn't confirm if this functionality is restricted to a particular 3750 model, such as 3750E, or if it applies to all models. It also doesn't specify any particular IOS feature set. I've tried Cisco Software Advisor but it doesn't list this feature on either the 3750E or 3750-X. This is possible on the 2960-S switches (i.e. cross-stack 10gig EtherChannel)?
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Feb 17, 2011
I just upgraded to an E4200 from a D-Link DIR-655. I cannot seem to get my desktop to connect to the E4200 at 1 GBS. My adapter is set to "auto negotiate" but will only connect at 100 MBS. If I try forcing the adapter setting to 1 GBS, it never connects. I can swap out my E4200 with the DIR-655 and it will connect at 1 GBS just fine. I am using a CAT 5E cable. Is there something I'm missing here or is the E4200 just more finicky than the the DIR-655?
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Mar 12, 2012
Brand new 2960. When I plug a cable into the port, nothing happens. The port light doesn't begin negotiation or anything, it just stays dark. The cable works fine--I have it on another switchport with a crossover connector connecting to a little Cisco SOHO switch without problems.
I've done the following:
switchport
switchport mode trunk
switchport trunk allowed vlan 1
no shutdown
In other words, I've fiddled with it. But I don't know why it doesn't light up..
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Sep 24, 2012
We recently upgraded the switch to which an old security device was connected. It worked fine on the old switch's FastEthernet port, which was configured for speed 10 and duplex half, as that is what the device required. The new switch is a 3560X with all Gigabit ports, but the security device's port, also configured with speed 10 and duplex half, does not connect properly.As a temporary test, we daisychained another switch that has FastEthernet ports, and the security device works again.Is there anything else that needs to be added to the configuration, when using Gigabit ports at 10/half?
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Sep 27, 2012
I have a switch WS-C3750E-48PD, I had two cameras that use 15.4 W in these ports and two days ago these ports go down, now the ports don't deliver PoE but are good when connect a computer.
SWP-D302-1-1#show power inline
Module Available Used Remaining
(Watts) (Watts) (Watts)
[Code]......
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Jan 31, 2012
I'm not able to set the mtu on an SVI or routed gigabit port on either model. they are running 12.2(55)SE4.
It comes back as "% ip mtu is not supported on this interface".
Also, is there any reason why when the "ip tcp adjust-mss", (set to lower than default) is applied to the egress SVI on a 3750 or 3560x, the mms value of the SYN packet is not adjusted when captured at the receiving end? It seems as if the setting does nothing.
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Jun 4, 2013
I'm trying to configure and etherchannel between 2 switches. A 3750 and a 3750G, but the port channel is down: 3750. [code]
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Feb 14, 2013
We have a scenario where we want to connect 14 access layer 2950 switches to Core switch 3750 via optical fiber in a LAN.What model of 3750 Switch should we use to tackle this situation.I have learnt that WS-C3750X-24P should support it.Isnt it?
Can we use optical fiber SFP module to connect 2950 switches to core switch?Does Cisco 2950 Switch support optical fiber sfp module?
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Jun 15, 2012
in my production environment two swtiches with stack and all ports are in the same Vlan 2 192.168.117.254 and the default getway is 192.168.117.1install correctely all were working fine but from yesterday onwards some of the ports are getting down automatically and coming up automatically and all devices are having static IP's no dynamic. [code]
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Jun 5, 2012
I have a Cisco 3750G-48PS Running IOS 12.2(40) and was wondering how many physical ports are supported in an LACP Configuration. Is it 4 or 8 ports in a single switch.
If I have a dual 3750 stacked together, and I want to configure (8) port LACP, Can I take (4) ports from each switch in the stack and LACP together.
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Aug 27, 2012
I am receiving the following error message on a Cisco 3750 switch stack. Need troubleshooting this error message.
00:03:13: %SW_MATM-4-MACFLAP_NOTIF: Host 00d0.7400.2730 in vlan 600 is flapping between port Gi2/0/3 and port Gi2/0/2
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Oct 26, 2011
I am working on a request to clean up alot of excess cabling in one of our IDF's. I noticed that many of the connections have no lights on them and probably haven't been used in a long while. I would like to know if there is a CLI command I can run on the Cisco 3750 switch will allow me to bring up a list of ports which have not seen any activity for a period of time - for example, 30, 60, or 90 days.
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Aug 19, 2012
I have a cisco 6509 switch in which i have 2 SUPs. I am using 3 Qty. of WS-X6748-GE-TX in the same switch. First 24 ports of module 1 and are not working. I replace the faulty moldule with the working one but now the new (good) module's first 12 ports stopped working. But when I insert the good card (the replaced one with the faulty) in other chassis it works fine.
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Jul 10, 2012
This has been happening repeatedly time to time! we just replace the part! But now it has come to trouble us again.It happening only in one module like 6 to 10 ports wont work.
we run IOS cat4500e-universalk9.SPA.03.02.00.SG.150-2.SG.bin will there be any bug in it?
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Aug 11, 2011
I was wondering if I could use the CISCO3945 Integrated Gigabit Ethernet WAN ports for routing, I need to enable BGP and I was willing to use one of those ports.
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May 2, 2012
I want to police the traffic coming from host 10.0.0.10 that is connected to another switch via port-channel interface the port-channel have interfaces G2/049 and G2/0/50 , i have applied below config to the SVI 112 but this is not working, as the host is still able to go beyond the policed rate also in the "sh policy-map interface vlan 112" command everything is showing 0(zero).
class-map match-all CM_FTP_PORT_49
match input-interface GigabitEthernet2/0/49
class-map match-all CM_FTP_PORT_50
[Code]......
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May 15, 2013
I've created some port forwards from my public IP (Dialer0) to our private LAN but only the 25565 port forward works. I've even added an any statement to the Nat source list Homenet_NAT. Full config attached. My Cisco router is an 877W. [Code]
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Nov 23, 2011
I am using a cisco 3750 in my network as a gateway, and above it I use a squid machine for caching my internet. My network is like this:
Basically I have two VLANs on my network which are VLAN10 and VLAN100, VLAN10 is the cooperate network of my office. VLAN100 is the management VLAN which i use for the switches. I keep the squid as well the client in VLAN10.
squid (192.168.1.50)---->cisco 3750(192.168.1.123)---->Distribution Switch(cisco 2960)---->client PC (192.168.1.5)
I have done nating on squid and internet is working pretty fine when I use the client gateway as the squid, but when I use the cisco 3750 as my gateway after adding route maps for forwarding the internet traffic coming to the cisco 3750 to squid it disconnects me from internet as well I cannot even reach the switches from the corporate network. These are the only Lines I used for the routing:
!
route-map proxy-redirect permit 10
match ip address 110
[Code]......
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Mar 27, 2013
I have applied below script and i can see the script successfuly exceuted but i cant see the file which should store on the flash.Below is script, event snmp oid 1.3.6.1.4.1.9.2.1.56 get-type next entry-op ge entry-val 60 exit-time 10 poll-interval 1
action 1.1 syslog msg "CPU Utilization is high"
action 1.2 cli command "en"
action 1.3 cli command "show proc cpu sorted | append flash:abc.txt"
action 1.4 cli command "show proc cpu history | append flash:cpu2info.txt"
action 1.5 cli command "show ip inter bri | append flash:cpu3info.txt"
action 1.5 syslog msg "cpu commands verification"
When I do show flash i cnat see the files in the flash.
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Feb 1, 2012
CEF concept working in cisco 3750 , 4500, and 6500 switch.If we implement in router how it s working...
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Dec 17, 2011
We plan to implement multicasting on our network where the sourec and destination are going to be in different vlans.I have a test 3750 switch, Layer two multicast works fine, when I place the source and destiantion in different VLan it fails. [code]
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Mar 28, 2011
I have a Cisco Catalyst 4507R+E (with Sup7-E) and two blades; one WS-X4748-RJ45V+E and one WS-X4648-RJ45-E.
When I connect a device to a port on the WS-X4748-RJ45V+E blade the port will not come up, show interface shows the status as "notconnect". When I connect the same device to the WS-X4648-RJ45-E blade the interface comes up.
The WS-X4748-RJ45V+E blade seems to have initialised okay, it appears in the output of "show module" as OK.
I get exactly the same effect on a second, identically configured Catalyst 4507R+E.
The software version is IOS XE 3.1.0SG, which according to the release notes supports the WS-X4748-RJ45V+E blade
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Jan 3, 2012
My network is like this:
Cisco 3750 (Core Switch)-----> Cisco 2960 (Distribution Switch)-----> Client (PC, Laps, Printers…etc)
Basically I have 3 VLAN’s. Office VLAN (for cooperative usage) which is VLAN 999 which has a defined IP address of 192.168.1.123 and Guest VLAN (for the guests who visits our hotel, most of it are wifi AP’s) VLAN 20 which has an IP address of 10.172.4.1. All these SVI are defined on the core switch.
Is there any way I can introduce a new VLAN lets say VLAN 40 and use PBR to route the packets going to VLAN 40 in the IP range 192.168.1.x to VLAN 999 and 10.172.4.1 to VLAN 20? I have tried this already and it is not working. Here are the configurations I have used.
Access-list 110 permit ip 10.172.4.0 0.0.0.255 any
access-list 120 permit ip 192.168.1.0 0.0.0.255 any
route-map INT_RVLAN permit 10
match ip address 120 110
set ip next-hop 192.168.1.123 10.172.4.1
interface VLAN 40
ip policy route-map INT_RVLAN
Where have I gone wrong?
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Jul 30, 2012
I am facing issue with http login after IOS upgrade on 3750 switches. I upgrade IOS from c3750-ipbase-mz.122-35.SE5.bin to c3750-ipbase-mz.122-53.SE2. bin Any other command I have to run.
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Nov 8, 2011
I have a couple 3750 switches that I am trying to run VTP Version 3 on.one as primary and the other as "server" which implies secondary from my research. [code]Additionally, running a show VTP devices yields a "No VTP3 devices found" on both devices. Despite ensuring that the domainname and password match.I have a patch cable from Gi1/0/1 on switch one runnning to Gi1/0/1 which from what I read is acceptable on GigE.
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Mar 19, 2012
In my Cisco 3750 get rebooted and now the SFP module is not working.
It showing the following error message.
05:13:22: %PHY-4-CHECK_SUM_FAILED: SFP EEPROM data check sum failed for SFP inte
rface Gi1/0/26
05:13:22: %GBIC_SECURITY_CRYPT-4-ID_MISMATCH: Identification check failed for GB
IC in port Gi1/0/26
What is the error message indicating and what is the solution for this.
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Jan 30, 2012
I have a Catalyst 3750 switch configured in a network. I would like an additional 3750 switch as a "hot" standby. A 2nd 3750 switch was purchased, and the same configuration was entered in to the new switch, so I have 2 switches with the exact same configuration.
When I move the connections to the new switch, I have a few VLANs that do not come up. One VLAN does come up and work normally. The VLANs in question show down, protocol down, and a show ip route reveals routes to the networks on these VLANs are not there When I put everything back on the original switch, everything works normally.
Why would the new switch not work with the exact same configuration?
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Apr 12, 2012
I only want SSH to be allowed when accessing this switch, but telnet is still allowed, why? Whe authenticate via radius.version 12.2no service padservice timestamps debug datetime msecservice timestamps log datetime msecservice password-encryption!hostname 3750!boot-start-markerboot-end-marker!logging buffered 64000logging console informationallogging monitor informationalenable secret 5 $1$1K$!username admin privilege 15 secret 5 $1$Bs$cLHusername users view priv3 secret 5 $1$Jfnviwp!!aaa new-model!!aaa authentication login default group radius localaaa authentication enable default lineaaa authorization consoleaaa authorization exec default group radius local !!!aaa session-id commonclock timezone GMT 0clock summer-time BST recurring last Sun Mar 2:00 last Sun Oct 3:00switch 1 provision ws-c3750g-12sswitch 2 provision ws-c3750g-12ssystem mtu routing 1500udld aggressiveno ip domain-lookupip domain-name CB!!login on-failure loglogin on-success log!!crypto pki trustpoint TP-self-signed-3817403392enrollment selfsignedsubject-name cn=IOS-Self-Signed-Certificate-3817403392revocation-check nonersakeypair TP-self-signed-3817403392!!crypto pki certificate chain TP-self-signed-3817403392certificate self-signed 01 3082024C 308201B5 A0030201 02020101 300D0609 2A864886 F70D0101 04050030 31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274 69666963 6174652D 33383137 34303333 3932301E 170D3132 30343133 31303539 33395A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649 4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D33 38313734 30333339 3230819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281 8100C31D AE6DD8B5 56245317 AD96F4F4 727385D4 97A5B138 488A215E 4294FC40 1C5B2F26 2B75E1CF E562F240 118F2F50 0CFF2449 16EC66EA 2D489F5F F36BFD05 ACCC79CA DDDA984D 4CB7AB DD95A5E0 9274A225 3F5A3634 DEBF1A2A 416E2189 B35B4473 C7D5EE2C E3D41675 A86F31CD.
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Jan 28, 2013
Unable to limit traffic on catalyst 3750 gigabit ports it has fiber modules,
I want to limit traffic 2mb per port
I have tried srr-queue and policier but it is not working and there is no ratelimit command under any interface, Applying policy to output is not supported of the interface
policy-map rate-limit
class class-default
police 2000000 8000 exceed-action drop
int gi1/0/3
service-policy input rate-limit
still when I start download it goes to 10 mbps
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