Cisco Switching/Routing :: VLAN Bridge With Catalyst 3750

Nov 8, 2012

I have 3 VLANs here that need to be on the same network segment.  They are going to be used by our Wi-Fi network (with Aironet APs), bound to 3 different SSIDs (as Aironet APs doesnt allow multiple SSID per VLAN), each one with a different authentication method and server.Is there a way to bridge those VLANs together with a Catalyst 3750 switch?  I tryed configuring an IP address on one of the VLAN interfaces, then configuring a bridge with the vlan-bridge protocol (Catalyst 3750 doesnt have the "ieee" bridge protocol type) and put all 3 VLAN interfaces on the same bridge-group, but it didnt work (even with "bridge x route ip").I also tryed configuring IRB bridging, with the 3 VLAN interfaces on the same bridge-group and an IP address on the BVI interface (the way I used to do with old 2600 routers).  Same result.(actually, I didint test to see if the interfaces are actually being "bridged", but I see neither of them can reach the router)

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Cisco Switching/Routing :: 3750 STP Vlan 21 And 22 Root Bridge On 2 Switches

Feb 16, 2013

I config vlans 21-23 on 3750 A and B switches.I config B  switch to be Root Bridge for all vlansspanning-tree vlan 1,21-23, priority 4096 sh span tree on B  switch 3750B#  sh spanning-tree.

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Cisco Switching/Routing :: Catalyst 3750-X Not Showing VLAN As Active

Apr 14, 2013

I have installed a Catalyst 2960-S and a 3750-X-12S and I am trying to setup a VLAN 51 for some VoIP phones. I have added the VLAN as an interface on both switches, but the 3750 is not showing VLAN 51 as active when i do a show vlan. Also, it omitts showing Gi1/0/1 & Gi1/0/3 which are uplinks to 2960-S switches plugged in and working on VLAN1.
 
Catalyst3750SFP#show vlan
VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Gi1/0/2, Gi1/0/4, Gi1/0/5

[Code].....

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Cisco Switching/Routing :: Configure Inter-vlan On Catalyst 3750

Dec 20, 2012

My architecture is the same as show on the link with some difference.I use the router 1841 for inetrnet connexion instead of 7200VXR, this router 1841 is connected on the catalyst 3750 port G1/0/1.I use catalyst 2960 instead of catalyst 2950 or 2948.I use ASA 5510 for conexion on remote branche(I have 5 remote site), This ASA is connected on the catalyst 3750 port G1/0/37
 
Result of the test:

-I can ping devices in the same Vlans
-I can ping devices in different VLANs
-I can ping all device from the catalyst 3750
 
I cannot ping the router 1841 or ASA 5510 from the any devices (computer)The gateway of each computer is the correpondant VLAN IP address configured on the catalyst 3750.Why I cannot ping the router 1841 or ASA 5510 from the any devices (computer)

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Cisco Switching/Routing :: Catalyst 3750 - VACL And ACL To Secure VLan?

Feb 20, 2012

i have a catalyst 3750, in this switch i have 3 vlan, i need to secure trafic between vlans but im confused ,should i use ACL or VACL to secure ?which is the best ?if i use ACL to secure and limit ports between vlan, which is the best practice to apply the acl ( on th inside or outside of interface)

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Cisco Switching/Routing :: Multiple VLAN Routing Tables For 3750 Catalyst

Oct 24, 2012

I have a network with a Catalyst 3750 as the main switch and then some Catalyst 2960 switches that are plugged in to that. I have a server running windows server 2008 with a couple of virtual machines running in Hyper-V. I created 4 VLANS listed below and gave the 3750 the following IP Address.I would like the 3750 to only be configurable from VLAN 40 but currently every VLAN can connect to it, I noticed in the standard web page settings there was a setting for "Management VLAN" but it was set to 1 and would not let me change it, I kinda assumed that was for the management port in the back.-Now the tricky part, I was trying to set up routing between the VLANs and so far I have only been able to get a sort of "all or nothing" routing to work. I can turn IP routing on and add two or more VLANs to the routing and it works fine. But what I was hoping to do is create a couple of "junction vlans" that would only route to one or two other vlans. For instance, I wanted to create a VLAN 100 that routed to VLAN 20 and 30 but nothing else. I also want to route VLAN 1 just to VLAN 30, and so on. I am able to do each one of the cases but only one, it seems like the switch only supports one "routing table" am I missing something or is this just a limitation of the switch?

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Cisco Switching/Routing :: Catalyst 3750 Multi-cast VLAN Routing

Oct 28, 2012

I have a network with several catalyst 2960 switches and one catalyst 3750. I have created two VLAN and set up the proper routing and everything is working fine there. I have a client/server application that used multicast in the initial start up for the client to determine available servers, the issue is one of my clients is on a different VLAN then the server. I am able to route the multicast using MVR as long as both the server and the client are plugged into the 3750 by creating a static route, making the server a source port and the client a receive port. Unfortunately I need the client and the server plugged in to different 2960s. My question is how do I establish multicast routing between the two and perferably do it dynamically (always route multicast traffic from one VLAN to another).

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Cisco Switching/Routing :: Inter-VLan Routing On Catalyst 3750 Switch

Dec 17, 2011

I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net.
 
My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20
 
I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to  (vlan2)my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to go out to the internet.  I think it has to do with the routes. [code]

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Cisco Switching/Routing :: Catalyst 3750 / 2960 - Some Data Cannot Pass Through VLAN

Sep 4, 2012

I have a problem, here are the situation

- 1 Catalyst 3750
- 1 Catalyst 2960
- 4 Finger Print
- 1 HUB
 
Configuration

- Catalyst 3750
Interface VLAN182
IP Address 10.62.182.254 255.255.255.0
Interface G0/2
Description Finger Print Server
Switchport mode access

[code]....
 
Here are the problem,If i connect Finger Print Device to port catalyst 2960, some device not sending data to server, but if i connect all Finger Print to HUB and from HUB connect to Catalyst 2960 at port F0/5, All Device(Finger Print) can send data to server...Is there any special configuration in catalyst so all device can direct connect to port catalyst 2960 without HUB?

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Cisco Switching/Routing :: 3750 - Extending VLAN To Remote Switch That Already Has VLAN ID In Use

Jan 10, 2013

I have two networks at two sites with a dot1q trunk between the two L3 switches at both sites (no routers involved)
 
SITE A - Cisco 3750 L3 - VLAN ID 50
10.10.50.0/24
 
SITE B - Cisco 3750 L3 - VLAN ID 50
10.20.50.0/24
 
I would like to extend the SITE A VLAN to SITE B so that I can move hosts from SITE A to SITE B without needing to change their IP address but the vlan ID is already in use. Obviously the easy solution is to change the VLAN ID for one or other of the sites but both sites contain hosts that run 24/7. Is there a way to join two VLANs with different IDs together.So for example I create a new VLAN 60 at SITE B and associate it with VLAN 50 at SITE A.

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Cisco Switching/Routing :: Low Bandwidth On 3750 From Vlan To Vlan?

Nov 20, 2012

We have a low bandwith (15-20 Mbit/s) to the ASA from our Client vlan. If i connect the Client to the same vlan as the ASA is, the bandwith (90 Mbit/s) is good.
 
Here are the Layer 3 Design:
 
Client     ->     vlan 2 - Switch - vlan 7     ->     vlan 1 - ASA 5505     ->     ISP
 
The Layer 2 Design:
 
Client     ->     Gig2/0/13 - Switch - Gig4/0/43     ->     Eth0/1 ASA5505     ->     ISP
 
IP Address:
Client: 172.16.2.10Vlan2: 172.16.2.1Vlan7: 172.16.7.1ASA: 172.16.7.2
  
I assuming the switch has a problem with routing ?It is a stacked Switch with following members:

switch 1 provision ws-c3750g-12sswitch 2 provision ws-c3750g-24tsswitch 3 provision ws-c3750g-24tsswitch 4 provision ws-c3750x-48
 
And we have following error message in the log from the switch:

%PLATFORM_UCAST-4-PREFIX: 

One or more specific prefixes could not be programmed into TCAM and are being covered by a less specific prefix, and the packets may be software forwarded I first get the idea that the switch is overloaded with router traffic. Thats why i assuming i have to check the sdm templates, but i'm not sure if this resolves the issue. 
 
Here are the relevant config:
 
ASA Interface on the Switch:

interface GigabitEthernet4/0/43description ASA-inside LANswitchport access vlan 7switchport mode accessspanning-tree portfast
 
Client Interface on the Switch:

interface GigabitEthernet3/0/1switchport access vlan 2switchport mode accessswitchport port-securityswitchport port-security aging time 2switchport port-security violation restrictswitchport port-security aging type inactivitymacro description cisco-desktopspanning-tree portfastspanning-tree bpduguard enable

[code]...

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Cisco Switching/Routing :: 3750 As A Port Channel Bridge?

Dec 7, 2011

I have 3750 core/distribution switches with routing enabled in two offices connected with copper link and L3 port channel interfaces. NewOffice#2 has moved about 5 miles farther away from office#1 and I have to deploy new core/distribution switch connect it to old core#2 via F.O and move all access switches with it. Old core will stay in old #2 offices as a bridge between office#1 and new office#2 Office#1core<->copper (Ethernet) <->oldoffice#2core<->f.o. <->new office#2core How I should configure port channels ports on oldoffice#2 core to act as bridge between office#1 core/dist and newoffice#2 core/dist without changing anything else (ip, etc) on whole network

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Cisco Switching/Routing :: Catalyst 3750 Low On Memory

Jul 25, 2012

have 3 Catalyst 3750 in same stack, the IOS version is 12.2(53)SE2. Today we can not telnet/ssh to this switch, but ping is ok, and switch function is ok. I try to access the console port, it show "low on memory, try again later". After I reboot the master switch in the stack, the master switch change to another switch, then I can telnet/ssh to this switch. I check the Ciscoworks server syslog report, there are many MAC address flapping error message, and I beleive the MAC address flapping occured before several weeks. ( the G2/0/15 & G3/0/15 is connect to a VMware ESX server and the EtherChannel config mismatch with this Catalyst 3750 switch ) How to mention the root cause of the "low on memory" problem and what is the abnormal memory usage ( free memory percentage below ?% )?

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Cisco Switching/Routing :: Catalyst 3750 Won't Boot

Apr 9, 2013

my Catalyst 3750 switch. Following a power cut the switch no longer boots up. The SYST light flashed green but no POST checks are made. I cannot see any boot messages from the console port either. The switch was on a UPS but some thing may have damaged the switch.

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Cisco Switching/Routing :: Catalyst 3750 With Tacacs And Vrf

May 13, 2012

There is a requirement to configure tacacs and radius on catalyst 3750X (version 15.0) where two vrf exist.Is therer a solution to configure "tacacs-server,host x.x.x.x vrf yyy" ?? I know it is possible to configure under the "aaa group server radius xxx" the command "ip vrf forwarding yyy".Is there anything else for the tacacs-server and radius-server command?

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Cisco Switching/Routing :: Catalyst 3750 Having More Than 128 VLans

Feb 18, 2012

Is is correct that vlan's exceeding 128 runs without spanning-tree.?

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Cisco Switching/Routing :: Catalyst 3750 - Route To 2nd ISP

May 2, 2012

I have Catalyst 3750. and 2 ISPs
 
I wanted to use, let say on port5 of Catalyst 3750 only 2nd the ISP will route to this port.
 
The rest is pointed to the 1st ISP.
 
Im thinking of using VLAN..

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Cisco Switching/Routing :: About Intervlan Routing On Catalyst 3750 Switch

Apr 16, 2012

I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net. My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20,I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to  (vlan2),my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to,go out to the internet.

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Cisco Switching/Routing :: Does Catalyst 3550 Support Inter Vlan Routing

Jul 24, 2007

Does Catalyst 3550 switch support inter vlan routing ?

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Cisco Switching/Routing :: 3750 BPDU Guard And Bridge Loops

May 22, 2013

We have an environment where users create a lot of bridge loops.  We have tried to send E-mails about it and educate the users but it is almost a lost cause at this point.  The loops are created when users don’t pay attention and they plug a patch cable coming off of an access port up to ANOTHER access port by mistake.
 
All of our access ports are from 3750 stacked switches.  The way we tried to deal with this in the beginning was with BPDUGuard and ERRDiable (BPDUGuard) auto recovery.  We turned BPDUGuard on globally and left BPDUGuard auto recovery at the default value (I believe it was 30 seconds). so a loop would be detected and after 30 seconds, the switch would try to enable the port and if the loop still existed, close the port for 30 more seconds.  Then we started having problems with printers getting "fried".  Their NICs would die out and the control board would need to be replaced.  After a lot of troubleshooting and testing, it was determined that allowing the ports to come out of ERRDisabled state would flood the network and the packets would generate in the millions per second range and fry the NIC of these printer.
 
The fix for this and saving the printers was terrible.  We removed ERRDisable auto recovery and just let the ports that are looped stay in an ERRRDisabled state.  We wait for the user to figure out the loop and try to use the port and then put in a work order.  Then we physically visit the site and verify the port was shut (ERRDisabled) from a loop and we bounce the port (shut/no shut) and everything is resolved. I did lab tests with a switch looped and a printer on the switch and watched it fry.  We have had no printers fry after we removed the auto recovery protocol at every location.  Only the locations where loops existed and auto recovery protocol running were printers going bad.  What I found during my lab tests was that each time the port was auto-recovered (yes, for that millisecond while it checks if a loop still exists), more packets were re-generated and eventually enough was re-broadcastthat printers would go down.  We never had a problem with computer NICs.  I guess the cheaper printer NICs couldn’t handle the broadcast storms created by this.  I tried playing with the auto recovery timers and even the highest setting would eventually re-create these storms.
 
 So my question is what best practices are others using?  Should we get rid of BPDUGuard and just try to let spanning-tree handle these bridge loops?  Is there something else I can try?  I’m not CCNA by any means, just trying to do what I can in my environment.  Manually visiting sites when loops occur is becoming more and more my job, though and I have plenty of other things to be doing.

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Cisco Switching/Routing :: Software Adviser For Catalyst 3750

Oct 11, 2012

I was browsing the Software Adviser on Cisco's website to look for a suitable IOS image, for a 3750. The system displayed a couple of suggested IOSes. there was no mention of IOS 15.0SE version.Could the Software Advisor be not up to date with the current Catalyst IOS releases?

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Cisco Switching/Routing :: SPAN Configuration In Catalyst 3750

Dec 31, 2011

I have CISCO catalyst with VLANs (VLAN ID 33, 36, 40-53) configured. I need to configure port mirroring in Switch 3750 for NAC (Network Access Control).  I need to Monitor all the VLANs. Here is the SPAN configuration of switch: [code] Monitor session 1 source vlan 33 , 36 , 40 – 53.Monitor Session 1 destination interface fa 1/0/8  (here I am not able to set encapsulation dot1q ) because the error occurred saying %one or more dest port do not support the encapsulation%.

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Cisco Switching/Routing :: DHCP Server Catalyst 3750

May 28, 2013

I have customer who has as Core Switch one Cisco Catalyst 3750 with the IOS c3750-ipbase-mz.122-35.SE5.I know that this image support DHCP Server configuration, but I like to implementate new vlans (approx 15) and I want to know if this switch support 15 DHCP Servers.

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Cisco Switching/Routing :: Sg200 Lag Setup To Catalyst 3750?

May 27, 2013

How to setup a port channel between a SG200 and 3750 and am having problems.
 
What do I need to do on the SG200 I have added the port into the lag but the port will not come up.
 
I spent half a day messing arround with the web interface and I am unable to get the port to come up.
 
The Cisco 3750 is a standard port channel config which I have setup maytime before. channel-group 1 mode active channel- protocl lacp Switchport mode trunk

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Cisco Switching/Routing :: How Many EtherChannels Supported In Catalyst 3750-E

Oct 13, 2012

I am working in an environment where i have to use more etherchannels, any way that how many etherchannels could we create on Cisco Switch 3750 e. do they can utilize high process resources of CPU.

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Cisco Switching/Routing :: Catalyst 3750 And 3750X Together In One Stack?

Nov 20, 2011

if I read the Datasheet of Catalyst 3750X-Series-Switches it is possible to connect a new X-Switch to an existing and old Catalyst 3750-Series Stack.What kind of requirements are needed? Only same IOS-Version in the hole Stack and if possible same Feature-Set? .... like in a normal NOT mixed Stack?

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Cisco Switching/Routing :: LACP - SGE2000P To Catalyst 3750

Apr 24, 2012

Is it possible to configure LACP etherchannel to a Catalyst 3750?  Playing around with the SMB switches for the first time. 
 
I know how to do it on the 3750 but am having trouble figuring out the sge2000p. 

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Cisco Switching/Routing :: SFP-10G-ER Is Not Supported On Catalyst 3750-X And On Other Switches

Sep 23, 2010

SFP-10G-ER are not supported on Catalyst 3750-X and on other switches ....
 
%PHY-4-SFP_NOT_SUPPORTED: The SFP in Gi1/1/1 is not supported
 
Why ?When will ER be supported ?

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Cisco Switching/Routing :: Connect SF302-08P To Catalyst 3750

May 7, 2012

I am trying to use a SF302-08P switch to connect a conference phone (Cisco 7937) to my infrastructure.  I connected the G2 port on the SF302 to a Gig copper port on the Catalyst.  I configured both ports as trunked ports and port e1 on the SF302 as an access port for the phone.  VLAN 1 is the default VLAN and VLAN 10 for voice.  However, the phone does not connect to the Call Manager.  I have changed the configurations on the G2 trunked port and the ethernet port (trunked ports, general ports, tagged and untagged).  I have also changed the configuration on the Ethernet port (general, access, trunk, set it on the default VLAN, in the voice VLAN, etc.)  The SF302 connects to the Catalyst, and PCs connect OK. 

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Cisco Switching/Routing :: Auto-QoS On Catalyst 3750 LAN Switches?

Aug 12, 2012

why the AutoQoS macro does not implement "priority-queue out" when configured on the 3750 platform running certain versions of software. The only other platform I have experience with AutoQos is on the 4500 and it enables priority queuing as expected. So what's up with autoqos on the 3750 on version 12.2(35)SE5?
 
When it comes to configuring QoS on campus user/phone access ports there are some important settings that can and should be considered but one can argue that enabling the priority queue is the single most impactful or important command. So I was very surprised and concerned when I didn't see priority-queue out. Cisco describes AutoQoS as a simple, quick way of deploying QoS on the LAN and it precludes you from having to learn all of the differences between hardware platforms. But is it true that this tool produces an incomplete config solution? Let me know if I am missing something.
 
Here is an example of what AutoQoS produces when applied to a 4507 with WS-X4648-RJ45V+E:(other interface commands are left out for simplicity)
 
interface GigabitEthernet5/25description XYZ
switchport mode accessauto qos voip cisco-phoneqos trust device cisco-phoneservice-policy input AutoQos-VoIP-Input-Cos-Policyservice-policy output AutoQos-VoIP-Output-Policy
 policy-map AutoQos-VoIP-Output-Policy
class AutoQos-VoIP-Bearer-QosGroup
set dscp ef

[code]......
 
Here is an example of what AutoQoS produces when applied to a 3750 running version 12.2.(35)SE5: (no priority-queue out)
 
interface GigabitEthernet1/0/36
switchport access vlan 8
switchport mode access
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0

[code]......

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Cisco Switching/Routing :: Catalyst 3750 Failover Configuration

Jul 16, 2012

Our servers are hosted at the Main site, site office A access to the Main site for Internet and servers. We are thinking NextG to take over when the link between sites goes down.
 
To start with, what is the configuration for 3750 at Site A and the Main site:

1) Trunking for both switches

2) Routing

3) the automatic failover configuration for the switch at Site A.

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Cisco Switching/Routing :: Catalyst 3750-E Software Recovery

Jan 31, 2012

I have the wrong code on the device. I can get to the switch: prompt. The manual say to connect a PC to the management port.  But it does not come up. x modem does not seem to work. I found some commands :

Examples : This example shows how to clear the Ethernet management port statistics: switch: mgmt_clr

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Cisco Switching/Routing :: Catalyst 2960G Vlan Configuration?

Oct 24, 2011

I have got a catalyst cisco 2960G series switch and via this switch I want to creat serveral vlans. I am getting a dhcp IP from a router and I want to setup my own vlan networks.
 
I plugged in the Ethernet cable that came from the dhcp router to port 16 of the cisco switch and configured the ports 1,2 and 3 for vlan 1, 2 and 3
 
the dhcp router has given me this IP 192.168.10.158 defautl gateway is : 192.168.10.1
 
when I plug in a PC to port 1 or 2 of the cisco switch I still receiving the IP from range 192.168.10.* but not from the range that I configured for the vlan 1 or 2.
 
Below is my startup configuration:
 
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id

[code].....

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