Help required - mac address table, virtual pc/ip addressing issue

Hi, hope someone out there can help?
This is the scenario
SW1 (WS-C2960G-48TC-L) port gig0/1 has a PC connected to it with ip address 10.182.8.6 and a Virtual IP address 10.182.8.107
SW2 (WS-C2960-24TT-L) port gig 0/1 has a PC connected to it with ip address 10.182.8.106
The system is designed so that if there is an issue with the PC connected to SW1, the PC on SW2 will take over the Virtual IP address and continue working.
We have a couple of other PC's in different subnets to the above PC's that use the Virtual IP (VIP) address to communicate with the PC that is 'on line'.
Unfortunately, the vendors software doesn't currently gratuitously refresh the arp to advertise the change of mac address for the VIP.
Is there anyway we can get the 2 dcnsw to 'refresh' on a regular time period to capture when the VIP changes to the other PC?

Hi Stephen
Without meaning to sound rude, the software which uses a VIP is not very well designed if it is not capable of sending a Gratuitous ARP one the Active one fails.
The default ARP cache timeout is 4 hours so an ARP entry will remain in the table and once the timeout is up, the switch will send an ARP to check if the device is still alive and if not, remove the entry from the table.
You could look at reducing the ARP timeout on a per port basis:
#interface gi1/0/1
#arp timeout 60
This will change the ARP cache timeout to 60 seconds for that port but having not used this before, I am not 100% this will address your issue. I would not advise trying to change the global ARP cache timeout for a production switch as this will increase ARP traffic and could cause problems if reduced to a small value.

Similar Messages

Help required Simple salary table calcuation

Hi All,
I am starting to use the LiveCycle Designer.I want to create a form for Salary calculations. Table with 3 rows n 2 columns.
Gross Salary - 10000 (Default and Editable)
Basic Sal - (Gross Salary * .012) (It shows based on Default GSal value)
Rest - (Gross Salary *.088) (It shows based on Default GSal value)
The functionality :
Basic Sal and Rest will by default show value based on the Gsal
Every Time GSal Changes the Basic Sal and the Rest columns.
What will be the Javascript to be associated to achieve the recalucation part once the user enters some other gross salary value.
I have problems even seeing the defalt one itself.
Mycode for the Basic Sal and Rest cells:
----- form1.#subform[0].Table1.Row2.BSal::calculate: - (JavaScript, client)
this.rawValue = (GSal.rawValue * .012);
----- form1.#subform[0].Table1.Row3.Cell2::calculate: - (JavaScript, client)
this.rawValue = (GSal.rawValue * .088);
Someone please do help me out with some help.
Thanks and Regards,
Hari.

Hello Hari. Using FormCalc, here are the two scripts.
Sum(GSal)*(.012) - Place in the calculate event of the BasicSal field
Sum(GSal)*(.088) - Place in the calculate event of the Rest field
In each of the calculated fields, in the Value tab under the Object tab, set the type to Calculated - Read Only and make sure the Calculation Script button is checked. As a side note, I used decimal fields for this in case your users might need to enter an odd salary amount, like 10012.34.
Regards,
Dave

How can I see the mac address table of a vSwitch

I am having some ARP collisions on my network and have determined that the offending mac address belongs to VMWare. I have already looked at the mac address tables of my physical switches but can't find the VMWare mac address I'm looking for. I would like to look at the mac address tables of the standard vSwitches to try to track down the root of the problem, but I fear that is not a possibility.
Does anyone know a method to display the mac address table on a vSwitch?

Hi midi25,
>>I would like to be able to see what devices are connected and if possible remove any stale entries.
Hyper-v virtual switch doesn't need us to manually maintain that "table" like a physical switch .
Best Regards,
Elton Ji
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected] .

Why "mac-address-table static 0000.0c07.ac01 interface FastEthernet1/0 vlan 3" in the router ?

Hi All
I did not type the following command. Why does it appear when I show run ? Which command can cause the issue? Thank you
mac-address-table static 0000.0c07.ac01 interface FastEthernet1/0 vlan 3

Hello,
It looks as if you have HSRP configured. Mac address 0000.0c07.ac01 is the HSRP virtual mac address. 01 at the end of the mac represents the HSRP group number.
Hope this helps,
Please rate helpful answers.
Thanks.

Mac-address-table takes too long to update on 4507R

Hi,
I'm trying to use spectralink phones, I have autonomous APs on seperate 2960s (and one on the 4507) - when the phones roam between the APs it takes very long for the mac address table to update on the 4507 even though there's uplink traffic.
I have supervisor engine II+ (I read there are problems in previous versions)
can anyone help?
thanks

Upgrading the switch could help avoid this problem..

Show mac-address-table

Given the command show mac-address-table from the privilege exec mode in a cat 2950, the output shows some (i think 4) mac-address tha are system. Do u have any idea what are these mac?

Hi Dimitris,
Thanks for writing in. I tried the command on my switch and got the following: Do you see a similar output and is this what you are referring to?
2950#sh mac-address-table
Mac Address Table
Vlan Mac Address Type Ports
All 0009.7c70.f9c0 STATIC CPU
All 0100.0ccc.cccc STATIC CPU
All 0100.0ccc.cccd STATIC CPU
All 0100.0cdd.dddd STATIC CPU
0100.0ccc.cccc is used for CDP/VTP/DTP/PAgP/UDLD
0100.0ccc.cccd is used for PVST+
0100.0cdd.dddd seems to be related to multicast, however need to confirm on this.
0009.7c70.f9c0 is the mac address for my management vlan interface.
2950#sh int vlan 1
Vlan1 is administratively down, line protocol is down Hardware is CPU Interface, address is 0009.7c70.f9c0 (bia 0009.7c70.f9c0)
Hope this helps.
regards
-Alok

Mac Address Table

Hello,
In one of our core switches, the output of the mac-address-table shows some mac addresses which come up as MPLS Multicast address when I looked them up under MAC Manufacturer(See below). Also, in the mac-address-table under the port column, those mac addresses display several ports associated with them and the word Router(see attachement). My question is, why are these MAC addresses come up as MPLS Multicast and why under the ports is it has the word Router?
Thanks in advance...
Prefix
Vendor
01005E
Internet Multicast (01:00:5E:00:00:00 to 01:00:5E:7F:FF:FF)
01005E
MPLS Multicast (01:00:5E:80:00:00 to 01:00:5E:8F:FF:FF)
01005E
Internet reserved by IANA (01:00:5E:90:00:00 to 01:00:5E:FF:FF:FF)
01005E
Internet reserved by IANA (01:00:5E:90:00:00 to 01:00:5E:FF:FF:FF)
01005E
MPLS Multicast (01:00:5E:80:00:00 to 01:00:5E:8F:FF:FF)
01005E
Internet Multicast (01:00:5E:00:00:00 to 01:00:5E:7F:FF:FF)

Hi,
Yes multiple MAC addresses are supported on each port. The switch learns the MAC by noting the source address of the packet received on each port and on that basis it builds what we call MAC address table. There is an aging mechanism in place which removes the inactive MAC addresses and allows new ones to be learned as devices are connected and disconnected.
The default aging time is 300 seconds, however if need arises you can change the same by giving the command - 'mac address-table aging time number vlan vlan-id'.
Have a look at the following link-->
http://www.cisco.com/en/US/products/hw/switches/ps5213/products_configuration_guide_chapter09186a00801cdf85.html#wp1063713
Hope this helps!
Regards,
AbhisheK
Please rate all helpful posts!!!

Mac-address-table synchronize

Dears
Would like your assistance please regarding command "mac-address-table synchronize"
My understanding is that it syncs CAM table between different DFCs & RSP PFC
So If we are having only one DFC there would be no need for this command. It will only be useful in case we are having several DFCs or there is a communication between DFC and ports connected in RSP.
1- Correct ?
2- Is SVI interface considered to be part of DFC or PFC ?
I am asking this cause if part of PFC then this command would be needed
Many Thanks
Regards
Sherif Ismail

Sherifismail,
I see that its already been answered anyway again:
My understanding is that it syncs CAM table between different DFCs & RSP PFC
==Answer is yes.
So If we are having only one DFC there would be no need for this command. It will only be useful in case we are having several DFCs or there is a communication between DFC and ports connected in RSP.
1- Correct ?
Answer: No you still required. else sometime you might see the mac address present in the software and not on the module.
2- Is SVI interface considered to be part of DFC or PFC ?
I am asking this cause if part of PFC then this command would be needed
Answer: I would believe it would be part of PFC.
HTH

Mac address table on a PIX

What am i missing?
pixfirewall# show mac-address-table
                   ^
ERROR: % Invalid input detected at '^' marker.
[EDIT: karat is under the A in mac ]
pixfirewall# sh ver
Cisco PIX Security Appliance Software Version 8.0(4)
Device Manager Version 6.1(3)
Compiled on Thu 07-Aug-08 19:42 by builders
System image file is "flash:/image.bin"
Config file at boot was "startup-config"
pixfirewall up 175 days 11 hours
Hardware:   PIX-525, 256 MB RAM, CPU Pentium III 600 MHz
Flash E28F128J3 @ 0xfff00000, 16MB
BIOS Flash AM29F400B @ 0xfffd8000, 32KB
0: Ext: Ethernet0           : address is 000d.28f9.62a5, irq 10
1: Ext: Ethernet1           : address is 000d.28f9.62a6, irq 11
2: Ext: Ethernet2           : address is 000d.8810.a620, irq 11
3: Ext: Ethernet3           : address is 000d.8810.a621, irq 10
4: Ext: Ethernet4           : address is 000d.8810.a622, irq 9
5: Ext: Ethernet5           : address is 000d.8810.a623, irq 5
Licensed features for this platform:
Maximum Physical Interfaces : 6
Maximum VLANs                : 25
Inside Hosts                 : Unlimited
Failover                     : Disabled
VPN-DES                      : Enabled
VPN-3DES-AES                 : Enabled
Cut-through Proxy            : Enabled
Guards                       : Enabled
URL Filtering                : Enabled
Security Contexts            : 0
GTP/GPRS                     : Disabled
VPN Peers                    : Unlimited
This platform has a Restricted (R) license.
Serial Number: 807234146
Running Activation Key: 0x6ab205ba 0x986d4239 0xf56523af 0x76f3d58b
Configuration last modified by enable_15 at 12:58:08.130 EDT Thu May 16 2013
pixfirewall# show mac-address-table
                   ^
ERROR: % Invalid input detected at '^' marker.

Hi,
Command Modes The following table shows the modes in which you can enter the command:
Command Mode
Firewall Mode
Security Context
Routed
Transparent
Single
Multiple
Context
System
Privileged EXEC
Source:
http://www.cisco.com/en/US/docs/security/asa/asa80/command/reference/s4.html#wp1448364
- Jouni

Help required with Photoshop Elements 4.0 this has been installed on my new Toshiba laptop with windows 8.1 for some 18 months and operating well. Now it will not open, message pops up saying "attempt to access invalid address" then "application not respo

Help required with Photoshop Elements 4.0 this has been installed on my new Toshiba laptop with windows 8.1 for some 18 months and operating well. Now it will not open, message pops up saying “attempt to access invalid address” then “application not responding” Suggestions how to access would be much appreciated. Tks. Stuart

What is the size of your hard disk? PSE 4 is a very old program and I suspect it is not able to access the entire hard disk on your machine. Just a thought here.

Help Required in Ship To Address in Purchase Order

Hi all,
Is it not possible to have multiple ship to address made available as drop down list in Logistics tab of Purchase order.. It is possible in Sales order. I require the same as i need to ship the product from different location...
In business partner it does allow the vendor to have multiple ship to address so would it not be possible to select any ship to address in purchase order...?
Regards,
Jona

Hi Jona,
The system does not provide this functionality. You could create an add-on that adds this drop-down list and populates the address field based on the address that the user chooses. However, you could use a formatted search to achieve the same kind of function.
The following query could be set up as a formatted search on the address field:
select
     case
          when Street = '' then ''
          when Street is not null then Street + char(13)
     end +
     case
          when Block = '' then ''
          when Block is not null then Block + char(13)
     end +
     case
          when City = '' then ''
          when City is not null then City + char(13)
     end +
              case
          when County = '' then ''
          when County is not null then County + char(13)
     end +
              case
          when Country = '' then ''
          when Country is not null then Country
     end +
              case
          when ZipCode = '' then ''
          when ZipCode is not null then ' ' + ZipCode
     end
from
     CRD1
where
     AdresType = 'S'
             and CardCode = $[$4.0.0]
You should modify the script to fit your own address format requirements.
Hope this helps,
Owen

CNA 5.5 and show mac address-table

When trying to Monitor/Search for MAC address in C2960 network I got an error reply that a CLI command is not supported. Analyzing network traffic shows that CNA 5.5 is issueing 'show mac-address-table' command but the latest Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(55)SE does not support 'show mac-address-table' anymore but does support 'show mac address-table' command. How can I change the command for showing mac address tables in CNA 5.5?
M.

hi john,
the show mac-address-table command should be valid.
check if you've got MAC learning enabled on the ASA interface using show mac-learn command.
edit: could you post show firewall? the above command works on transparent firewall only.

Mac address table corruption?

We are running Cisco 4500 chassis at the access layer, and have been for a few years without issue. Recently we started to experience issues where a mac address will just randomly "jump" to another port. User will call us and say their computer is not working. We will locate the mac, and its showing on the wrong port. We shut that port, do a no shut, and the mac jumps back to the correct port. In the example below, the mac address jumps to port 3/2, but is physically connected to 2/12.
!--issue before shut/no shut
mdf#show mac address-table | inc 9ebf
236      782b.cb8c.9ebf    static ip,ipx,assigned,other GigabitEthernet3/2
!--port security knows the correct info however
mdf#show ip dhcp snooping binding | inc 9E:BF
78:2B:CB:8C:9E:BF   xxx.xxx.236.193   76145       dhcp-snooping   236   GigabitEthernet2/12
mdf#show mac address-table int gi2/12
Unicast Entries
vlan     mac address     type        protocols               port
---------+---------------+--------+---------------------+-------------------------
3908      20bb.c021.ae58    static ip,ipx,assigned,other GigabitEthernet2/12   !--ip phone
mdf#show mac address-table int gi3/2
Unicast Entries
vlan     mac address     type        protocols               port
---------+---------------+--------+---------------------+-------------------------
236      1803.7339.d93d    static ip,ipx,assigned,other GigabitEthernet3/2
236      782b.cb8c.9ebf    static ip,ipx,assigned,other GigabitEthernet3/2         !--mac in question
236      782b.cb8c.c366    static ip,ipx,assigned,other GigabitEthernet3/2
3908      b414.89a2.2ae0    static ip,ipx,assigned,other GigabitEthernet3/2
!--fixing issue
mdf(config)#int gi3/2
mdf(config-if)#shut
!-- issue resolved
mdf#show mac address-table | inc 9ebf
236      782b.cb8c.9ebf    static ip,ipx,assigned,other GigabitEthernet2/12
Switch is running cat4500e-entservicesk9-mz.151-2.SG2.bin , but also happened on cat4500e-entservicesk9-mz.151-2.SG4.bin and cat4500e-entservicesk9-mz.150-2.SG4.bin. Other switches have also had this issue occur.

Looks to be me like a bug.
could you please provide me some more details on this:
1- How often this issue is occurring?
2- Is this occurring to specific ports or specific laptops which are connecting to this ports or is it irrespective of devices?
3- Is there any possibilities that you try rebooting one of the switch if the issue is very often? (I know this is not a feasible solution , I know it is some issue iwth the firmware but in case to avoid high impact you can reboot the switch and update me?
4- Provide me with the logs from the switch?
5- I will do the bug scrub and let you know.
HTH

Show mac-address-table not working on ASA5512

Hi,
I'm unable to excute "show mac-address-table" on an ASA5512, running 9.1(1). The output is:
asa-test# show mac-address-table
^
ERROR: % Invalid input detected at '^' marker.
Has the command changed for this model / version? It works fine on ASA5505's running 8.4(5).
Thanks for your time,
John

hi john,
the show mac-address-table command should be valid.
check if you've got MAC learning enabled on the ASA interface using show mac-learn command.
edit: could you post show firewall? the above command works on transparent firewall only.

TS3212 error message help: This software requires Mac OS X version 10.6.8 or later.

Hi I'm trying to download the most up to date version of itunes and keep getting this message: This software requires Mac OS X version 10.6.8 or later. I have a mac book pro? can I not download this??
Cheers
Lisa

Hi Niel thanks for that I tried that I'm runnung Mac OS X 10.6.5 it's not having it from the software update in preferences either I think I'm going to need a DVD!!
Thanks for your help
Lisa

Help required - mac address table, virtual pc/ip addressing issue

Similar Messages

Maybe you are looking for