Nov 18, 2015 · Hi, It seems that the client is, for some reason, using RFC 4361-compatible IDs.These consist of two parts: First, the so-called IAID (Identity Association ID) that uniquely identifies the client's interface (4 bytes); second, the so-called DUID (DHCP Unique ID) that identifies the entire client as an entity.

Mar 23, 2006 · Instead the MAC (or as Windows calls it the "UniqueID") is a 48 character string. I attach a screenshot, the switch is the top one in the list, the other ones are regular PC hosts who show their MAC address. I need to be able to work out in advance what a Cisco 2950's switch MAC (or UniqueID) is going to be to allow me to create a reservation ...

Jan 10, 2007 · I just setup a 2611 running 12.2 IP Plus to obtain a DHCP lease from my 2620 running 12.3(10) (IP/FW/IDS PLUS IPSEC 3DES BASIC), and Im getting a rather unusually long MAC address showing up in a "show ip dhcp binding", which is almost 3 1/2 times as long as a conventional MAC. When I translate thi...

Jan 18, 2016 · 1. On a access switch WS-C3650-48PD when I execute show mac-address-table aging-time command it gives below output. I know 300 is the default mac address ageing time. access-switch# show mac address-table aging-time Global Aging Time: 300 Vlan Aging Time---- -----But on one of the core switch it was showing a value 15000 along with 300.

Jun 23, 2009 · In catalist switch mac address table aging time = 300 sec (by def, and we dont change it). But on practice, we observe that mac address stay more than 5 min in this table (appr - 9,5 min)! why this occurs?!

Oct 24, 2013 · As you might now there is a maximum amout of MAC addresses that you can store in your mac-address table and also for tracking purposes you want to make sure you learn the mac addresses of devices that are actually in your network. What happens if you learn the mac address of PC1 and after a few minutes, that pc is disconnected from the network.

Dec 17, 2005 · Anybody know how long a mac address stays in a Cisco IOS arp cache when issuing "show ip arp"? How about a mac address in a CatOS switch when issuing "show cam dynamic". What constitutes the length of time an arp entry is cached?

Jul 24, 2011 · Use the show mac-address-table address xxxx.yyyy.zzzz command and under the "age" column you'll see the age in seconds since it was last updated. Sent from Cisco Technical Support iPhone App 0 Helpful

Aug 6, 2011 · If you want to verify the MAC aging time, first of all, you have to check for the output of the show spanning-tree command - the other output of show mac address-table may not display the temporarily reduced aging time. Also, I suggest you leave the inter-switch connection running, and instead, connect or disconnect some other port going to a PC.

Sep 4, 2013 · 'sh version' command displays the below Mac Address of the Switches: Switch A: Base ethernet MAC Address 0010.113C.D2EE. Switch B: Base ethernet MAC Address 000A.F3D5.09BD. Switch C: Base ethernet MAC Address 00E0.8FDE.01A1. Other input: Switch A is in VTP Server Mode. It has 3 Vlans (Default + 2). Switch B and Switch C is in client mode.