Cisco Switching/Routing :: Block All DHCP Packets Through 2960S LAN Base IOS?

Mar 23, 2013

I am trying to block all dhcp packets through 2960S lan base IOS. But when i set no trust interface for dhcp snooping, the dhcp packet source port will be err-disabled.  Is there any other solution to block any DHCP packet through switch without interface or other service outage?Is possible to block DHCP packet through specific VLAN?

View 6 Replies


ADVERTISEMENT

Cisco Switching/Routing :: 2960S - How To Setup DHCP Relay For VLan2

May 9, 2013

Windows Server 2008 R2 has two DHCP scopes 192.168.1.x (for data) and 192.168.2.x (for VOIP). The Catalyst 2960-S has Vlan1 for the Data V LAN and V lan 2 for the VOIP network. How do I setup DHCP relay for Vlan2 to get their IPs from the scope on the Windows server?
 
Used to doing ip helper-address x.x.x.x in other Catalyst switches, but not available here.

View 2 Replies View Related

Cisco Switching/Routing :: Catalyst 2960S - Dynamically Assign IP Address To Computers Via DHCP

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. 

View 9 Replies View Related

Cisco Switching/Routing :: 3750v2 DHCP Snooping Not Working Dropping Packets

Jan 9, 2013

I recently installed DHCP snooping on a 3750v2 switch (Version 12.2(55)SE4) and configured the uplink(Po2) as a trusted port. The problem is that clients cannot receive an IP address. When I disable DHCP snooping it is working properly. DHCP snooping is configured correctly but I don't have an idea how to resolve it. [code]I tested the solution on the same kind of hardware switch and firmware and it worked out fine. What is causing the clients not to receive an IP address from the DHCP server?

View 10 Replies View Related

Cisco Switching/Routing :: ME3800 Stop Forward DHCP Relay Packets Immediately

Mar 29, 2012

I faced with issue on ME3800. [code] With that configuration there is no problem with DHCP Relay packets.But if I add  on interface #xconnect 82.199.1 19.1 77 encapsulation mpls it will stop forward DHCP relay packets immediately. All other traffic transfers without problem.

View 2 Replies View Related

Cisco Switching/Routing :: Feature Set LAN Base / Lite (2960) And LAN / IP Base (3650X)?

Mar 28, 2012

1)For 3650X I found some contradiction in the Q&A about feature set LAN Base vs IP Base:

LAN Base: Can I do static IP routing ?
LAN Base: SVI => is this for intervlan routing ?
 
2)For 2960, there are 2 flavors (LAN lite and LAN BASE) Q: Can I do static routing on one of these flavors ?

View 2 Replies View Related

Cisco Switching/Routing :: Downgrade 3750X With IP Base To LAN Base For Stacking

May 6, 2012

I have a WS-C3750X-12S-S (IP Services) that I THINK I'd like to downgrade to LAN Base so I can stack it with a WS-C3750X-48T-L that is already LAN Base..

View 4 Replies View Related

Cisco Switching/Routing :: 2960 Switch LAN Base To IP Base

Nov 14, 2011

can we upgrade 2960 switch  from Lanbase IOS to IPbase

View 4 Replies View Related

Cisco Switching/Routing :: 3560x / Block DHCP Requests Over VLANs

Jan 10, 2012

I have two 3560x Catalyst switches setup between two different locations. They link via a PTP line (Layer 2). I have setup Intervlan routing between the switches and that works fine.Each location has a separate subnet and a Windows DHCP server for each subnet.I want to block any DHCP requests to be sent from hosts on one subnet to the DHCP server on the other side (i.e across the PTP link) What is the best method to do this?

View 5 Replies View Related

Cisco Switching/Routing :: 3750 - How To Block Unauthorized DHCP SOHO Router

Jan 20, 2012

If it's possible, how do you protect/block a unauthorized DHCP SOHO router with NAT form a Cisco 3750?

View 16 Replies View Related

Cisco Firewall :: How To Block ARES With ASA 5505 Base License

Sep 1, 2011

Well, I tried using the cisco configuration for ASA 5505 for blocking P2P: url...but this configuration only is usefull with programs like Kazaa, so I try this configuration to block ARES but the problem is that ARES try to make downloads from different ports, ¿How do I block ARES if there are sereveral ports ?

View 1 Replies View Related

Cisco Switching/Routing :: 7600 Router Performance / Policy Base Routing?

Mar 6, 2012

When mutiple Policy based routing configured on 7600 routers, did the router performace degraded with the number of policy based routing rules?Also, did 7600 running 12.x use per-flow based routing or per packet based routing?

View 1 Replies View Related

Cisco Switching/Routing :: 3750X Static Routing When Running LAN Base?

Dec 27, 2012

I have a stack of 2 x 3750X switches these are running 12.2(55)SE5. I needed to add some static IP routes and found that the ‘ip routing’ command is not supported. I came across a document that stated “On switches running the LAN base feature, static routing on VLANs is supported only with Cisco IOS Release 12.2(58)SE and later.” So I have upgraded to 12.2(58)SE2, but ‘ip routing’ is still not a valid command.
 
The release notes state:“On the Cisco Catalyst 3560-X and 3750-X Series, it adds support for 16 static IPv4 routes in the LAN Base image.”
 
I have read other posts that talk about running the ‘sdm prefer routing’ command which I have done, but I am still unable to add any routes or run the ‘ip routing’ command.

View 4 Replies View Related

Cisco Switching/Routing :: Does LAN Base IOS Support SSO In L2 4507?

Apr 26, 2012

We will deploy several 4507 with 2xsup7 as a L2 access switches for our office.Does LAN_Base IOS version support SSO or we need purchase IP_Base IOS (L3)?

View 1 Replies View Related

Cisco Switching/Routing :: 3750X IP Base IOS Feature Set?

Oct 26, 2011

I have been looking to find out the list of features that the IP Base IOS has for the 3750X series switch.  What would be ideal is a comparable list but essentially I need to know which of the LAN Base/IP Base/IP Services has SSH functionality. 

View 1 Replies View Related

Cisco Switching/Routing :: 3750x 12.2-55.SE3 IP Base Feature Set?

Sep 9, 2012

Full feature set for IP Base with the 3750x.I just wanted to verify that I could create a routed port, turn ip routing on, and create static routes as well as a default route. From what I can find, there shouldn't be a problem with this on the IP Base Feature Set, I just wanted to verify. Or any link for the Features of IP Base on the 3750x.

View 3 Replies View Related

Cisco Switching/Routing :: Catalyst 3560-X IOS 15.0(2) IP Base?

Nov 29, 2012

We have observed increase of CPU utilization of 50% after upgrade from 15.0(1)SE3 to 15.0(2).The SDM template is  "desktop default" template.The increase of CPU utilization in Switches with LAN Base after upgrade is about 10%.
 
How to find the cause for the 50% increase ?This is command is the output of 15.0(2). The calculated sum for 5min process-utilization is 21% plus 1% interrupt is 22 %. Where is the rest ?
 
switch#sh proc cpu  sorted 5min | exc 0.00
CPU utilization for five seconds: 30%/1%; one minute: 29%; five minutes: 28%
PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
169   135084171    33273787       4059  9.92%  8.94%  8.73%   0 Hulc LED Process
  83    80075989    13546109       5911  5.60%  5.39%  5.38%   0 RedEarth Tx Mana

[code].....

View 17 Replies View Related

Cisco Switching/Routing :: 3560 - LAN Base On 3560X

Nov 1, 2011

why Cisco make 3560x switches with Lan Base(no routing functions)? What happen if I load an Image  L3, previously downloaded?    my device lost the warranty? or it doesn matter?

View 1 Replies View Related

Cisco Switching/Routing :: Why Does Routing Work Without Declaring Vlan10 On 2960s-24td-l

Oct 28, 2012

I have recently split the voice vlan (10) from the data network (1), and am wondering why my catalysts and router do not require an interface Vlan10 statement.  In the past I used OpenBSD boxes to do the routing, and I first needed to configure vlan 10 on the interface before I could get inter-vlan communication to work.  With these Cisco devices it works, and I am wondering if it is because of VTP, for the fact that the ports maybe just pass all traffic, or is there some other explanation?  Below is the setup, and firmware is up-to-date on all of the devices.
 
When I plug a phone into the POE SGE, the phone turns on, obtains an address on the proper subnet, and conversations are clear (whereas without the ip nat inside on the new subnet the calls had a lot of static).  Possibly the reason that it works is because the phones properly create the tcp/ip packet, and it hops over the trunks and creates the states so that traffic routes back properly.  I will install wireshark to see exactly what is going on, but is there a simple explanation that I am overlooking?

View 1 Replies View Related

Cisco Switching/Routing :: How To Enable Multicast Routing On 2960s

Mar 23, 2013

I need to enable multicast routing on 2960s but the command "ip multicast-routing" isn't available on my release (12.2.(55)).
 
From which release this command is available?     

View 1 Replies View Related

Cisco Switching/Routing :: 2960S And MLS QoS Map

Oct 8, 2012

I have C2960S-48FPS-L and C2960S-24TS-S both of them are using C2960S-UNVERSALK9-M image with version 15.0(2)SE on both I run "mls qos"
 
and on 48FPS-L I run "mls qos map cos-dscp..."on 24TS-S I cannot run it. there is no such command. there is just "mls qos rewrite..." and "mls qos srr-queue..." variants. 
 
I thought that one image give the same set of commands...?

View 5 Replies View Related

Cisco Switching/Routing :: 2911 Router With Base And Security

Feb 12, 2013

We have purchased a number of 2911 routers.We got Base & security license as we wanted to enable encryption. However we probably wont use the security.We are replacing 2811 routers.Unfortunately the 2811 routers have FXS ports with 2 - 4 POTS handsets - I completely forgot about these ports when I was ordering.Now I have VIC3-FXS cards which are ok in the 2911 but unfortunately I cant get them to work.I am missing PVDMs (well adapters anyway), and even if I got them the router wont take any commands relating to voice due to the license.Is is possible to 'rehost' the security and turn it into a UC ?I am new to these 2911 and Licensing.

View 1 Replies View Related

Cisco Switching/Routing :: IP Base To IP Service License Of 3750x

Dec 8, 2012

I am having a ws-3750x-12s-s  switch . I want to upgrade it from ipbase to ip service. after installing ip service liciense file, when i gave command " show license detail" i found there 3 index . one is for ip base -active (permanent) ..2nd is for ip service-active(permanent) 3rd  is again ip service but inactive( period 8weeks 2days) , then i cleared 1st one by giving command "clear ipbase" and reboot. but still 2 index .both for ipservice one is permanent-active another is inactive . so my question is how can i remove 2nd index which one is inactive and time period for 8weeks and 2days..?? becasue i don't need it. and it will make any problem in future ?

View 2 Replies View Related

Cisco Switching/Routing :: WS-X3750-24P-L For LAN To IP Base Upgrade License

Mar 26, 2013

Would like to ask what is the rigth SKU license for WS-X3750-24P-L for  LAN Base to IP Base Upgrade License

View 3 Replies View Related

Cisco Switching/Routing :: 3750 LAN To IP Base - Licensing Implications

Oct 29, 2012

I upgraded an image on 3750 from Lan base to IP base, it worked fine. howver im just wondering if there any licensing implications, did the upgrade a few weeks ago, would the switches still work on a temp license somehow?

View 2 Replies View Related

Cisco Switching/Routing :: 3750 Changing IOS From IP Base To Services

Feb 25, 2012

I have 3750 Switch and need to activate the ipservices on it , it is need a license file to switch from ipbase to ipservices , if i installed the ipservices image from cisco site , do i still need an activation  key to use it??

View 7 Replies View Related

Cisco Switching/Routing :: WS-C3560X-48P-L - Upgrade From LAN Base To Ip Services

Jul 5, 2012

I would I upgrade this from a LAN base to ip services?

View 2 Replies View Related

Cisco Switching/Routing :: 3750 - LAN Base License Limitations

Mar 3, 2013

I am bringing up a 3750x and a 2911 to replace a 3745 router with switchport module.  I was plannng on moving all the VLAN interfaces off the 3745 onto the 3750x and turning up EIGRP.  I discoved the 3750 has the LAN Base license, so I can't run eigrp off of it.  My question or worry now is, will the LAN base license prevent the switch from doing interface VLAN routing between the different VLAN's configured on it or will I have keep all the VLAN interfaces on the new router and just have a router on a stick setup?

View 4 Replies View Related

Cisco Switching/Routing :: 2960S Multicast Routing

Jan 17, 2012

while i am configuring a port on switch .The switch reloads.After reload the show version says,System returned to ROM by bus error at PC 0x458F6C, address 0x0,show version from the effected switch is,Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(58)SE2, RELEASE SOFTWARE (fc1).

View 4 Replies View Related

Cisco Switching/Routing :: STP Between 2960S And SG300

Dec 8, 2011

I am currently having an issue with connecting a Catalyst 2960-S switch to a Small Business SG300 switch. When I connect them they are unable to form a link. When I do a show spanning-tree it says the mst link is in dispute.

View 1 Replies View Related

Cisco Switching/Routing :: 2960S QoS For VoIP?

Mar 25, 2012

I read some papers about QoS. The thing is that I have to implement 30 switches with QoS to connect to a lot of Cisco IP phones. The switches are Cisco 2960S with code image "C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3". Should I use autoQoS feature or manually configure them?. How should I treat uplinks between access switchs and core/distribution? I have a lot of doubts regarding queueing, because all the info I had read its for another model/image.

View 4 Replies View Related

Cisco Switching/Routing :: Mix 10G And 1G Uplinks On 2960s?

May 16, 2013

I'm looking at the WS-C2960S-48TD-L and have a question about the uplink ports. Is it possible to mix 10G on one uplink and 1G on the other?  The datasheet says 2x10G SFP+, 2x1G SFP so I am thinking mixing is not possible.

View 6 Replies View Related

Cisco Switching/Routing :: How To Use USB Option On 2960s

Nov 5, 2011

just got new hardware and decided to try the newer USB port for IOS upgrades. I could not get the switch to recognize my 2gig flash drive. Do I need a proprietary stick or special format?

I also noticed when I removed it the switches crash dump and rebooted?

View 12 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved