Cisco Switching/Routing :: 2911 IP Conflict With Proxy Enabled

Jun 3, 2012

I had problem with  IP conflit address  from cisco router 2911 , all the time the router respond with ARP reply (duplicate use of IP : x.y.z.t with the same Mac Address ) and the IP subject of conflit dosen't appear in any router's interfaces configuration  (basic configuration without dhcp) ,the problem was solved  problem when I desactivete proxy arp but I can't understand this behavior , why arp proxy respond to all IP address with same Mac even the IP dosen't exist in router ?

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Windows 7 Proxy And Ip Routing Not Enabled

May 14, 2012

I have repaired tcp/ip stack and winsock by command prompt. When I check my ipconfig /all there are alot of things not enabled and default gateway with no address etc... I checked my advanced setting and dhcp auto obtain is enabled. When I try to release and renew ipconfig the addresses are missing and when I renew, it's completely missing.

OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: AMD FX(tm)-4100 Quad-Core Processor, AMD64 Family 21 Model 1 Stepping 2
Processor Count: 4
RAM: 8189 Mb
Graphics Card: NVIDIA GeForce GTX 460, 1024 Mb
Hard Drives: C: Total - 57138 MB, Free - 30554 MB;
Motherboard: Gigabyte Technology Co., Ltd., GA-990FXA-UD5
Antivirus: Norton Internet Security, Disabled

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Cisco Firewall :: Block Gtalk On New 2911 Security Enabled Router?

May 8, 2010

I want to block gtalk on my new cisco 2911 security enabled router.

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Cisco Switching/Routing :: 3750 Has IP Conflict With Another Device?

May 2, 2012

I just found out that one of our 10 3750's has been assigned with an IP Address that is in conflict with a PC that has been in production long before this 3750 was deployed in our environment.  Good thing it is servicing  devices on a separate vlan.  The conflict IP Address is assigned to the default vlan of the switch so we can connect to it from the core.If I change the IP Address of the switch, will it reboot and momentarily disconnect the devices connected to it?

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Cisco Switching/Routing :: Cat 6509 - DHCP Conflict On VSS

Apr 21, 2013

We have VSS configured between Cat-6509 switches (s72033-advipservicesk9-mz.151-1.SY.bin)..For the voice vlans,dhcp scope is configured within VSS and ip addresses are assigned to ip phones from these pools configured within VSS.Cat 3750 stack is connected with dual links to this vss. IP phones are connected to cat 3750 switches and desktop is connected back to IP phone. For data vlans IP addresses are assigned from external dhcp server.
Currently we are facing lot of ip conflicts for ip phones and after clearing the dhcp conflicts, IP phones starting getting IP addresses..(sufficient IP's do available in the dhcp scope for IP address assignment). (What exactly the role of no ip dhcp conflict logging command......)

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Cisco Switching/Routing :: 2960 / 3750 - IP Address Conflict?

Feb 7, 2012

I have switch 2960 and router that connect with one interface to that switch. the link is trunk and Router function is inter vlan routing between 4 vlan. This netwrok has only one ip address space that is and work without problem. We connect  cisco switch 2960 with optic link to another switch that in stack 3750 which configured as trunk link and allowed only 3 vlan between them. In the other side netwrok which consist the switch 3750 we have different subnet ip address that switch working in layer 3 too. the problem is that when I permit vlan 210 in the switch 2960 only layer 2 between this switch and the 3750 in network that consist th ip address devices, if I disconnect and then connect pc to network he says that he has ip conflict and in the log  he show mac address of router that has vlan 210 subinterface configured with 10.10.2./24 subnet. But how I gibe back vlan 210 from permited  vlan in trunk  devices start normaly working. If I again put vlan 210 to permit vlan in that trunk  devices again said that there are conflict  ip address and show mac address vlan 210 router subinterface.

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Cisco Switching/Routing :: WS-C3560E-24TD IP SLA Responder And Conflict IP Addresses

Sep 8, 2012

I have a network topology which you can see on image. All routers are Cisco 3745 with IOS (C3745-ADVENTERPRISEK9-M), Version 12.4(12). SW1 is L3- switch Cisco Catalyst WS-C3560E-24TD  with IOS  (C3560E-UNIVERSALK9-M 12.2(58)SE2). [code] After that I have problem. When PC with OS Windows 7 begins to work in corporate network, it sees "coflict ip addresses" and doesn't work with network. I've used wireshark and seen, when the PC send arp request a SW1 always send arp reply (see attached file). I think problem with command "ip sla responder", but I haven't searched information about it and I want understand this is bug or normal functioning.

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Cisco Switching/Routing :: Power Connect 6224 With Routing Enabled With Several VLAN Setup

Jan 19, 2013

I have a power conncet 6224 with routing enabled with several VLANs setup.VLAN Database: 6,8,10,90-254VLAN 6 is our management vlan10 is for our core network services (DNS, Domain, Exchange etc)90-254 are isolated vlans.What I need to accomplish is to prevent vlans 90-254 from communicating with each other and only allow communication to VLAN 10 and the internet. All internet firewall work will be handled by our Sonicwall. [code]

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Cisco Switching/Routing :: Catalyst 3560 - Routing Enabled With / Without Default Gateway Or IP Route Command

Feb 25, 2013

We have two catalyst 3560 switches running  c3560-ipbasek9-mz.122-58.SE2.bin  They are connected using etherchannel using gi 0/21 -  24 interfaces.
on 3560-1 switch, there isn't any ip-default gateway or ip route configured. It only have 1 interface vlan configured.
on 3560-2 switch, there is ip default gateway configured along with 1 interface vlan.
What i dont understand here is that, i can reach out to other subnets from 3560-1 switch in which the routing is not enabled?

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Cisco Switching/Routing :: Nexus 7000 Vrf Not Enabled?

Dec 9, 2012

Should I install any special license to enable vrf within Nexus 7000 VDC? I observed that vrf routing instance is not enabled in the VDC.

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Cisco Switching/Routing :: IOS License Not Enabled In New 3750x-12s-s

Oct 28, 2012

We have just received a new 3750X-12S-S to put onto our existing network but I am having a few issues getting this switch working correctly. For this post, the permenant license is not activating/applying, switch boot up gives the following errors:
*Mar  1 00:00:05.377: Read env variable - LICENSE_BOOT_LEVEL =
*Mar  1 00:00:05.972: %IOS_LICENSE_IMAGE_APPLICATION-3-FAILED: Image application receive image level as NULL.


From my understanding these switches come with the ipbase license as default, and the other switch I received (3750X-24P-S) has this license loaded with no issues.

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Cisco Switching/Routing :: Connecting VPC Enabled N5K To 4 X Stacked HP E3800?

Mar 17, 2013

I have a customer who just bought a pair of N5K and wanted to replace his current HP E3800 as Core. He wants to use the 4 x stacked HP E3800 connect back to the N5K. Will I be able to utilize VPC through a bundled 2 or 4 x 10G (40G) connection (10 or 20G on 1 switch, and 10 or 20G on another switch)  from the stacked HP E3800s to the N5548s? I know you can do that with Cisco 3750s.

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Cisco Switching/Routing :: 2960-S Possible Switch Behavior When QoS Is Not Enabled

Jan 30, 2012

Document at url... is quite interesting,One of these goes about the behavior of a switch (2960-S and 3750G) when QoS is not enabled vs the one when QoS is simply enabled with "mls qos".What additional commands, beside "mls qos", would be needed so as to simulate as accurately as possible the switch's behavior when QoS is not enabled?

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Cisco Switching/Routing :: 3845 CPU Utilization Reaches 100 % When NM-1T3/E3 Is Enabled

Jun 21, 2010

I have installed NM-1T3/E3 IN  A CISCO 3845 WITH IOS c3845-advipservicesk9-mz.124-9.T3.bin AND 512 MB RAM .WHEN I ENABLE THE CARD THE CPU PROC HISTORY SHOWS 100% WHEN DISABLED IT COMES DOWN TO 10%
Slot 0:        C3845 Mother board 1GE(TX,SFP),1GE(TX), integrated VPN and 4W Port adapter, 7 ports        Port adapter is analyzed
Slot 2: NM-1T3/E3 (clear/subrate) Port adapter, 1 port        Port adapter is analyzed

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Cisco Switching/Routing :: C3560 Output Drop Without MLS QoS Enabled

Nov 24, 2012

We are seeing output drops on a C3560 switchport, this port does not have QoS enabled -- application does not need special qos treatment, as long as packets are not droppd, so I suppose all traffic will share the same queue? then how should I read the output of "show platform port-asic stats drop" which indicates that it is queue 3 weight 2 drop? I am wondering what is the best way to fix this? enable mls QoS and increase queue 3 bandwidth share on this interface or just increase the output queue depth?
switch#sh mls qos interface gi0/1
QoS is disabled. When QoS is enabled, following settings will be applied
trust state: not trusted


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Cisco Switching/Routing :: Enabled Syslog On 2960S Switch

Oct 3, 2012

I have enabled syslog on my Cisco 2960S swtich as shown below -
-logging facility local6
-logging host transport tcp port 514
I have sent the port to TCP since that is what is configured on the SYSLOG server which is a CENTOS 5.8, running rsyslogd.I have tested the rsyslogd locally and it work.However i want to send any and all log messages in the buffer to my syslog server and it is not working.there is no firewall on the CENTOS and the ASA firewall filter is enabled for outgoing traffic.

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Cisco Switching/Routing :: 3560 Password Recovery Enabled Procedures?

Dec 21, 2011

Following procedures get to the switch: dir flash and get the following.....unable to stat flash//: no such device

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Cisco Switching/Routing :: 3750 - Cannot Enable PBR On A VLAN WCCP Enabled

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?
route policy config: 
access-list 70 permit ip host x.x.x.x (server IP)
route-map PBR1 permit 10


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Cisco Switching/Routing :: Configure Proxy On ASA 5510?

Jan 11, 2012

Can i configure proxy on ASA 5510? i.e for internet use my user should be authenticate by ASA5510 and after successful authentication user should be allowed to access internet and futher is it possible to do bandwidth managment with ASA5510?

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Cisco Switching/Routing :: 3750E - Sequestering Traffic On A Router-enabled Port

Nov 20, 2011

Is there a way to use the "no switchport command to enable routing on a port and yet sequester it from traffic on other vlans within the switch?
The switch in question is a 3750E

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Cisco Switching/Routing :: 2960 - Enabled With Additional Priority-queue Out Command?

Feb 20, 2012

I have a Cisco Catalyst 2960 with IOS Release12.2(53)SE (because of a contract I can not update it) ->  the release notes for this version describe the following:

When auto-QoS is enabled on the switch, priority  queuing is not enabled. Instead, the switch uses shaped round robin  (SRR) as the queuing mechanism. The auto-QoS feature is designed on each  platform based on the feature set and hardware limitations, and the  queuing mechanism supported on each platform might be different. There  is no workaround. (CSCee22591)
My config is as follows:

interface FastEthernet0/1 switchport access vlan 200 switchport mode access srr-queue bandwidth share 10 10 60 20 priority-queue out mls qos trust dscp auto qos voip trust no cdp enable network-policy 1 spanning-tree portfastMy question now is:When the priority queue is not enabled with auto-qos because of the software bug is it nevertheless enabled with the additional priority-queue out command?

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Cisco Switching/Routing :: Default IGMP Snooping Is Enabled On 3750 From Documents

Nov 14, 2012

We have a 3750 acting as the core. By default IGMP snooping is enabled on cisco 3750 from the documents.but, when we see the ip mroute table on the switch, it doesnt show any output.

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Cisco Switching/Routing :: 2960S - Default Queue / Buffer Settings When MLS QoS NOT Enabled

Feb 13, 2013

I have a customer that is seeing output drops on a 2960S with mls qos not enabled.  It appears that they are getting bursts traffic on the switch that is filling up the buffers, hence causing the drops.  I have a couple of questions:
1. What are the default queue/buffer settings when mls qos is NOT enabled on the switch.
2. Is there any good documentation out there regarding the buffer sizes of the different switch models
The customer is looking for an answer as to whether or not replacing the 2960S with a higher model would eliminate the output drops WITHOUT having to mess with QOS/buffer/drop threshold settings on the switch, and Cisco doesn't seem to make the buffer sizes readily available for the the smaller Catalyst switches.

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Cisco Switching/Routing :: 2911 With IOS Version Is 15.1 - Routing Table Not Updating

Oct 2, 2012

I am using Cisco 2911 & IOS version is 15.1. My problem is that after some days (e.g. 15-20 days), the routing table suddenly stops updating & then I have to enter the default route again to make it up. I am using Track 1 to track default route here. After primary link goes down, the Track is also going down but after coming the primary link up, the track is not coming up. So, I have to add the default route again to make it up.

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Cisco Switching/Routing :: WCCP On 6500 With Squid Proxy

May 19, 2012

I have been tasked to setup a Transparent Squid proxy and do redirection on  a Cisco 6513 Switch.I don't have access to the SQUID but think that my config below should be OK. We have setup a TEST user Vlan 13 . Any traffic from this destined for the we on 80 or 443 should be redirected. Vlan 10 is where the Squid proxy is sitting. [code]

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Cisco Switching/Routing :: 2950 - Enabled AAA New-model / Telnet Prompt Username Needed?

Nov 17, 2012

I was testing on 802.1x function on Catalyst 2950. the funtion itself work fine with my radius. but after I have setup the aaa new-model, I have no access to my switch!everytime I telnet it prompt me username, but I didn't create any user!!
how to recover to the origianl status, just prompt to input password but not username needed, and with 802.1x enable ofcause. [code]

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Cisco Switching/Routing :: 3750G / Switches Flooding Multicast Streams But IGMP Enabled?

Nov 3, 2011

I have a 2x Cisco 3750G switches (Stacked) that are part of an IP Video Surveillance System .All network is set to 1 VLAN (VLAN 1 default).The Cisco SWs ( Core )  are configured with IGMP Querier + Snooping .Connected to the Cisco SWs are 4 Fiber Rings(Loops)  for redundancy . RSTP and IGMP Snooping are enabled on all the network SWs .Network Architecture Figure :
When all Fiber Rings (Loops ) are connected , the Cisco and Ring SWs spanning-tree tables show the blocked and forwarding ports properly .I am able to connect all my IP Cams + Encoders to the Ring SWs and connect my Servers + WorkStations to the Cisco SWs to record and view the multicast ip streams .All streams from Rings 1 ,3 and 4 are getting normally to the Servers + WorkStations through multicast ( IGMP Snooping are filled correctly on the Cisco and non-Cisco SWs ) . All multicast streams are joined normally except for Ring 2 .The Multicast streams passing through Ring 2 will operate normally for around 2 hours then after that the Fiber SWs begin to flood their multicast traffic causing the cams on the same switch to drop off the network .

I checked the Configuration of all the SWs on Ring 2 but all are are the same .

What is weird is that I have to set all the streams to unicast to stop the flooding just on Ring 2 (All other rings are not affected ) then after some time if I enabled a video multicast stream on one of the SWs of the Ring it will be streamed properly to the Servers + WorkStations ( All IGMP tables along the way will be filled properly ) then again after 2 hours or so , the flooding will start again suddenly and all IGMP  table entries for the SW on Ring2 will be empty . No problem occurs on the other Rings which have more multicast streams .

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Cisco Switching/Routing :: How To Install New IOS 15.1 On 2911

Dec 12, 2011

i downloaded and transfered the new ios to the 2911, but no install routine started.

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Cisco Switching/Routing :: Enabling SSL-VPN On 2911

Nov 19, 2012

after installation of demo versions of 2900-SEC-TEMP & 2911-2921-SSLVPN-TEMP & rebooting the 2911 router I do not have access SSL commands.Show license indicates that 2900-SEC-TEMP & 2911-2921-SSL-TEMP licenses are active but NOT IN USE.

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Cisco Switching/Routing :: 2911 SFP Interface Number

Apr 19, 2012

I am configuring my first 2911 using a SFP card but I dont know the interface name for this module.
show inv shows the card..

What is the interface number for this card or if it needs some config before it will recognize the interface?

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Cisco Switching/Routing :: 2911 - Allow Traffic Between Two LAN Interfaces?

Nov 15, 2011

I have a 2911 router. One interface is configured external (WAN) and two interfaces are configured on separate internal private subnets. What is the configuration to allow all traffic in both directions between the two internal subnets?

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Cisco Switching/Routing :: USB Console Into 2911 Router

May 19, 2013

I have installed a cisco 2911 router and the cisco usb console drivers on my pc, win 7 64 bit.however when I use putty and open the com port assigned it just goes blank, I am using the usb port on my laptop to connect and using the cisco usb console cable provided

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Cisco Switching/Routing :: 2911 IP SLA Commands Missing?

Nov 13, 2011

I've got two routers, Cisco 2911's with 15.1(4)M1 on one and 15.0(1)M5 on another.
I'm trying to set up ip sla for vrrp tracking but the commands seem gimped?  I don't even have an option for ip sla <operation number>.  All I've got is ip sla responder/server/key-chain.

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