Cisco WAN :: 3750 - New VLAN 220 Not Working?
Aug 15, 2011
I am into creating a new VLAN, what I have missed in the setup / configuration. I have multiple Cisco switches, the VLAN is configured on a 3750. My attempt was to place the VLAN on one port (as concept) and work from there - - so it is on 2-02 of my main Cisco stack. The new VLAN is 220 - Printer. My present IP scope is 192.168.200.x - running out of addresses - trying to add 192.168.220.x. on VLAN 220 to relieve some pressure - -- Most I can do is ping the VLAN IP - 192.168.220.1 and that resolves - - but if I attach a networked device with a 192.168.220.x address - - cannot get there..
Here is the switch info...
version 12.2
parser config cache interface
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime
service timestamps log datetime localtime
service password-encryption
[code]....
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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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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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Mar 19, 2012
i have linksys modem which already working for different v lans then for lab we take other switch 3750 switch and created different v lans. v lans are working fine but we need internet for different v lans for that linksys modem how we can make interface V lan1/
ip address 10.1.1.10 255.255.255.0
ip default- gateway 10.1.1.1
no sh
interface Vlan10
ip address 10.1.2.1 255.255.255.0
no ip route-cache
!!interface Vlan20
ip address 10.1.3.1 255.255.255.0
ip route 0.0.0.0 0.0.0.0 10.1.1.1
ip dhcp pool vlan10
network 10.1.2.0 255.255.255.0
default-router 10.1.2.1
dns-server 10.1.1.1
!
!ip dhcp pool vlan20 network 10.1.3.0 255.255.255.0 default-router 10.1.3.1 dns-server 10.1.1.1
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Dec 5, 2011
We have a 3750 which has a few vlans configured. One Vlan is for public access wifi and another for our security system (door access, cameras, etc.). I don't want the public wifi vlan to access the security system vlan. How can I accomplish this in the 3750?
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Oct 24, 2011
I have a rather large network with multiple VLANs and routing. Here's the layout:
5540 subinterface = gi0/2.18 = 10.16.18.1/24 TRUNKED to a 2960
2960 has an interface set to VLAN 18 (no IP) goes to a Cisco 4507 with an int. set to VLAN 18 (no IP)
4507 then has a trunk to a Cisco 7206
7206 then trunks to a Cisco 3845
3845 trunks to a 3750 (single)
3750 (single) trunks to a 3750 Stack
3750 Stack has int. set to VLAN 18 that goes to a 3750(lab) w/ int set to VLAN 18 w/ IP 10.16.18.251/24, VLAN502 = 10.202.255.1/30,
VLAN510 = 10.203.255.1/30
3750(lab) then has a trunk that connects to ASA 5510 w/ subinterfaces: e0/1.18 = 10.16.18.253/24, e0/1.510 = 10.203.255.2/30, e0/1.502 = 10.202.255.2/30
ASA5510 then goes to Internet
Any trunks are set to allow all VLANs. From the 2960 to the 3750 stack it's obviously all Layer 2 with trunking.
Issue:If I sit at the 5540, I can ping 10.16.18.251 and .253 with no problems. I can also ping 10.203.255.1 with no problems. Problem is that I cannot get to the other subinterfaces on the 5510 for VLANs 502 and 510. How do I ensure that my trunk is set up right? I have a route in the 5540 pointing to the 10.203 and 10.202 using the 10.16.18.251 address. It seems like a traceroute gets to the 10.16.18.251 address but then it stops. What route should be on the 5510 to make sure it gets back? The default route on the 5510 points to the Outside. I think it's something to do with the trunk that's just something I don't understand yet.
5510:
show int ip bri:
Ethernet0/1.18 10.16.18.253 YES manual up up
Ethernet0/1.502 10.202.255.2 YES manual up up
Ethernet0/1.510 10.203.255.2 YES manual up up
[code]....
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Oct 18, 2012
How to configure internet access for different VLANs in cisco 3750 switc,ISP connection directly connecting to 3750 ,3750 have 18 VLANs
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May 4, 2012
Scenario: I have a vmserver w four virtual servers all in configured w in different subnets. What's the best way to configure a 3750-x switch to route traffic from the virtual servers to their vlans?
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Feb 7, 2011
I have cisco switch model WS-C3750G-12S-D. It is in transparent mode. I am getting below error message when tried to create new vlan.
Proposed configuration exceeds the limit of 1005 VLANs that can be supported on this platform. Reduce the number of VLANs proposed to be within this limit.
After deleting few unnecessary vlans, it allowed me to create.
3750#sh vtp statusVTP Version : running VTP1 (VTP2 capable)Configuration Revision : 0Maximum VLANs supported locally : 1005Number of existing VLANs : 959VTP Operating Mode : TransparentVTP Domain Name : VTP Pruning Mode : DisabledVTP V2 Mode : DisabledVTP Traps Generation : DisabledMD5 digest : 0xBC 0xA7 0xEC 0xDE 0x36 0x6C 0x61 0xB4 Configuration last modified by 97.193.17.172 at 0-0-00 00:00:00
I confused with terms 'maximum supported vlans' and 'maximum locally supported vlans'. If switch is supporting vlans 1-4094 means it should also allow to create locally. Otherwise how they will pass through the switch trunks without local creation.
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Dec 14, 2011
I am working on the exact same configuration as noted here [URL] that uses subinterfaces on the asa. I have two interfaces on my stacked 3750's configured as trunk ports (primary ASA on primary 3750 stack member, secondary ASA on secondary 3750 stack member).
My questions is what should the DG be configured on the 3750. Can I keep the 3750 in L2 or will I have to enable L3 routing? Should the VLAN interfaces be configured.
The port that the ASA is configured with has 3 subinterfaces on VLAN 100, 200, and 300.
The subinterfaces are G0/2.100, G0/2.200, and G0/2.300.I am in the middle of converting from 3 separate DMZ switches, each attached to their own port on the asa which is their default gateway to one physical port on the ASA broken into 3 subinterfaces which then connect to stacked 3750's. The stack will then have the 3 separate DMZs in actual separate VLANs.
My goal is to leave the default gateway for each dmz on the ASA so I don't have to modify other areas of the ASA config.
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Dec 18, 2011
Lets say I have the following topology.
DataCenter<---Etherchannel(2)-->BuildingB<---Etherchannel(2)--->BuildingA
There arer 3 stacks of 3750 at each building. The core switch/router in our network is at location B. The way it was originally setupis every L3 device has an ip address for each lan. So let's say we have VLAN 200 withnetwork 192.168.200.0/24. The DataCenter would be assigned (192.168.200.3), Building B would be assigned (192.168.200.1), and Building A would be assigned (192.168.200.2). I'm configuring the DC and BA to be L2 only and Building B to be the only real router in the network besides a few ASAs. When I ran a 'no ip address' on the vlan interface on Building A, the internet connectivity for 192.168.200.0 dies, but local connectivity is fine. After doing some research and troubleshooting, I found out that if I set the next hop on the ASA for the local networks for an IP address on building B everything works perfectly.
The way the routes on the ASA are setup for local networks are as follows.
All local networks have ip route localnetwork mask x.110.215.17. This address is the IP address of the inside interface on the ASA. Now, when I kill the IP address on the vlan interface on Building A internet connectivity goes down, while the next hop is still pointed to this address, BUT if I give it a next hop of the vlan interface ip address on B everything works fine. Now, I can easily fix this, I was just wondering why this is happening?
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Oct 10, 2012
Have a quick question regarding inter-vlan routing on a 3750. Overview of network is ISP --> ASA --> 3750 (acting as my core and default gw). I have 5 vlan interfaces on my 3750, all w/ 192.192.x.x subnets, a 6th w/ 192.168.100.x, and a 7th w/ 192.168.200.x. I have enabled "ip routing" on the switch and can successfully ping from subnet A to subnet B as long as both devices are using the correct DG for their vlan, which is the switch. I have a few ports that are trunked as well that go to ESX hosts which break out the vlans according to the subnet the vm should be attached to. The ASA is set to nat internal traffic for all the vlans.
Now my question: short of applying an ACL to each vlan interface to block traffic from other 192.192.x.x subnets is there a better way to accomplish this? I want my 192.168.10.x subnet to be able to reach all the subnets, but don't want 192.192.10.x to be able to talk to 192.192.20.x for example. I was thinking to create an acl like this:
access-list 120 permit ip 192.192.10.0 0.0.0.255 access-list 120 deny ip 192.192.0.0 0.0.255.255 192.192.10.0 0.0.0.255access-list 120 permit ip any 192.168.100.0 0.0.0.255 192.192.10.0 0.0.0.255
and then applying this to the interface for the appropriate vlan.
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Jan 18, 2012
I have one VLAN on a 3750 where I do not see any MAC addresses even though it is in use. This is an unrouted VLAN between a WLC on a port- channel /LAG and an access port to an ASA for guest traffic. When I do a show MAC add I get nothing for VLAN 60 (guest DMZ) but all other VLANs seem to be OK. Spanning tree is not showing TC counters incrementing either.
I also was told when put a port on this VLAN the laptop did not get a DHCP address form the ASA, but the wireless guest clients are working fine. I can see the DHCP leases and ARP entries in the ASA and the ASA ARP in the WLC so some traffic is passing fine. I'm not onsite right now so troubleshooting is all remote which limits some options.
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Jul 1, 2012
I have setup both Vlans on 3com and cisco. but it seems they cant talk to each other.ive setup both on trunking mode?
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Feb 29, 2012
I have a 3750 switch which has the command 'spanning-tree vlan **'. I am struggling to remove this command, as this particular VLAN is one I want to distribute across our network.I have so far, set the switch to VTP Transparent mode and removed the VLAN from the database, this removes the command. If I then put the switch back to VTP client mode (or manually add the VLAN, while in in VTP transparent mode) then the command comes back. Submitting the command 'spanning-tree vlan **' command has no affect.
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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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Apr 24, 2011
One of my VLANS on my 3750 gives a status of act/lshut. I've tried no shut commands on the interface to no avail. From my reading it seems like this means the VLAN is active but shut down locally.
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May 16, 2012
We have a need to access an VLAN at the main office( ie Core Switch 6500,switch 3750) from a remote site(Cisco3845 router, Switch3750) connecting by a SP through fibre link.
what is the easiest and quick way to do it and the user from the remote site just want to have access to that VLAN for a couple of days only.
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Feb 12, 2004
i want to know if the new Catalyst 3750 Support Private Vlan ?
or any other small Switches
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Dec 12, 2012
Cannot set route map on interface vlan. which in non default vrf on Cisco 3750.IOS c3750-ipservicesk9-mz.122-55.SE.bin sdm prefer route in enable ip vrf users rd 200:0 route-target export 200:0 route-target import 200:0 interface Vlan201 description Users 1 ip vrf forwarding users ip address 10.31.76.1 255.255.252.0 ip helper-address 10.31.4.57 route-map fromuser permit 10 match ip address fromuser set ip next-hop 10.31.128.155 When I enter "ip policy route-map fromuser" to interface Vlan 201 I heve the message:
% Remove VRF configuration from interface Vlan201 first
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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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Jun 25, 2012
I have 3750 series with GIBICs ports I want to create 10 vlans with its sub-net and enable all vlans to access internet.
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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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Mar 24, 2012
I have a network with the following structure
internet ---- cisco2911 ----cisco3750 --- internal lan
I have two email servers on different vlan
192.168.0.1 ----- 1.1.1.2 (public ip)
10.1.1.65 ---- 1.1.1.3 (public ip)
Before these servers were directly connected to the internet with two nics (Nightmare, I know). The Public IP on internet facing NIC and private ip on LAN facing nic. I'm in the process of changing this.I'm able to access internet from my vlans and also able to send emails but cannot receive emails on these servers.
My router congif is as follows:
Building configuration...
Current configuration : 6234 bytes
!
version 15.1
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
[code]....
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Nov 8, 2011
Currently we have a 6513 core (running IOS and doing limited routing) with VLAN Trunking to about a dozen 3560 edge switches, with various VLANs going to each of the edge switches. All works well. We are downsizing and replacing the 6513 core with a 3750G stack. We have the stack up and running in the lab, and want to slowly (as we move floors) migrate all of the edge switching to the 3750 stack.
The plan is to connect the 3750 stack to the 6513, then slowly migrate the edge switches to the stack (from the 6513). I would like to put in place 4 x 1GB trunk links between the 6513 and the 3750 stack before I start moving edge switches to ensure adequate bandwidth. Once all of the edge switches are on the new 3750 stack, I will start to decommission the 6513.
What is the best way to configure the links between the cores (old 6513 and new 3750 stack)? I can easily get the edge switches configured to the 3750, but am worried about the core links. I really want to avoid having to perform an all-at-once cutover of the cores. Another question is when do I try and migrate the VTP server role from the 6513 to the 3750 stack? I could simply make everything transparent, and ditch server-based VTP, as we rarely change or creat VLANs.
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Apr 7, 2011
I have set up an ACL on my 3750 switch to deny icmp from PC A on our inside network to PC B on a different VLAN on our inside network using the following ACLs:
deny icmp host 10.1.17.15 host 10.3.10.4
deny icmp host 10.3.10.4 host 10.1.17.15
-- or --
deny icmp host 10.1.17.15 host 10.3.10.4 echo-replydeny icmp host 10.3.10.4 host 10.1.17.15 echo-reply
These ACLs belong to an access-list that also limits ip traffic to a few specific machines.When I try pinging from PC A I receive a reply message back from PC B. Shouldn't this configuration block any ICMP from PC A to PC B and from PC B to PC A? I would have expected the first ACL statement to block any packets associated with ICMP and when that didn't work I tried the second configuration.
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May 27, 2013
I'm having some trouble getting my head round the following but I think it's routing related?
I have a Cisco 3750 switch with the following configured:
interface Vlan1
ip address 192.168.0.223 255.255.254.0
no ip route-cache
[Code].....
The 3750 is connected to a firewall which handles the routing. From the 3750 I can only ping remote networks from the vlan1 interface not from vlan6,8 or 10 i.e ping 10.34.37.101 (remote network) source 192.168.0.223 (vlan1) works but ping 10.34.37.101 source 10.74.10.1 (vlan10) does not? I can ping 10.34.37.101 from computers on the various vlans but not from the 3750 it self.
I looked at setting a default gateway for the various vlan interfaces
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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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Sep 15, 2012
I recently upgraded my network to have two 3750x core, one interface on the Cisco is connecting to a Net gear switch via a fiber converter. I am keep getting the vlan flapping error message in my log as below.
003396: Sep 17 01:46:16.328: %SW_MATM-4-MACFLAP_NOTIF: Host 5c0e.8ba7.0a5c in vlan 2 is flapping between port Gi2/0/15 and port Gi2/0/13
003397: Sep 17 01:46:19.843: %SW_MATM-4-MACFLAP_NOTIF: Host 5c0e.8ba7.0a5c in vlan 2 is flapping between port Gi2/0/15 and port Gi2/0/13
003400: Sep 17 01:49:58.769: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/17, changed state to down
[Code] .....
After my research i think this is a looping issue but I'm unsure how to address it.
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Jan 3, 2012
I would like to apply a policy-based route on one of our L3 switches (Cisco 3750) to change the next-hop of a couple of servers only. The VLAN where those servers reside got WCCP enabled on it. When I want to apply the route-policy to that VLAN interface it doesn't let me. When I try to apply the same policy to a VLAN interface without WCCP it does work. Is there any Cisco IOS limitations that would prevent me from doing that?
Configuration:
route policy config:
access-list 70 permit ip host x.x.x.x (server IP)
route-map PBR1 permit 10
[Code].....
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Feb 7, 2013
Currently have two routers inside our network.
One is the default GW 10.1.1.13
One is Jump Router for ATT 10.1.1.12
Both connected to HP Procurve L2 switch
The ATT Router is 10.1.1.2Want to replace GW and Jump with one 3750 L3 switch.icomplish this with only one port g0/1 connected to HP Procurve?Can I make the switchport 10.1.1.13 and then create a ip vlan999 10.1.1.12?route all to 10.1.1.2Or do I just connect two ports, and hardcode them with an ip?
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Feb 7, 2012
I´m facing to one issue with VACL. i have a network lan with 10.40.X.X/16 . in this network i have a Production v LAN 10 with 10.40.10.X/24 and i have created one vlan103 for Guest´ user as 10.40.103.X/24
My goals is to restrict the v LAN 103 to reach or access the v LAN 10, better to restrict Guest user access to the production v LAN. So i try to put this script with VACL method, but does n´t work.
Extended IP access list Restriction-Guest
10 permit ip 10.40.103.0 0.0.0.255 any
vlan access-map Guest 10
action drop match ip address Restriction-Guest
vlan filter Guest vlan-list 10
After that i still able to ping or access to the v LAN 10 form v LAN 103.
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May 6, 2012
My core switch is a 6509-e and my IDF closets have 3750's.I have a couple of vlans currently setup, that can communicate with each other.VTP is setup Client/Server where as my core is Server, all IDF's are Client.
What i'm trying to do is create an isolated VLAN. I want to setup a DHCP scope and use helper address. When i plug in a client to that VLAN, i want it to get an IP, but not have any other network access.
Is this possible to do without switching to Transparent mode? If not - what reprocussions will i see by switching to transparent mode?
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