asked on

mac-address-table command

I have never seen the mac table explained in depth.

What do all the heading mean?

* primary? as opposed to secondary?

vlan is the port the vlan is in that learned the mac but what if it is a static mac?

type and learn: how can you learn a static mac?

age: counts up or down to 300 seconds?

Ports: port that the mac was learned on? what about when it says switch or router?

what good is * --- xxxx.xxxx.xxxx static No - Router?

sh mac-address-table
Legend: * - primary entry
age - seconds since last seen
n/a - not available

vlan mac address type learn age ports
------+----------------+--------+-----+----------+--------------------------
* 720 xxxx.xxxx.xxxx dynamic Yes 5 Gi3/24
* 888 xxxx.xxxx.xxxx dynamic Yes 30 Gi3/7
* 836 xxxx.xxxx.xxxx static Yes - Switch
* 639 xxxx.xxxx.xxxx static Yes - Switch
* 720 xxxx.xxxx.xxxx dynamic Yes 75 Gi3/7
* 720 xxxx.xxxx.xxxx dynamic Yes 25 Gi3/24
* 12 xxxx.xxxx.xxxx dynamic Yes 70 Gi3/24
* 720 xxxx.xxxx.xxxx dynamic Yes 105 Gi3/7
* 836 xxxx.xxxx.xxxx dynamic Yes 0 Gi3/24
* 639 xxxx.xxxx.xxxx dynamic Yes 0 Gi3/24
* --- xxxx.xxxx.xxxx static No - Router
* 720 xxxx.xxxx.xxxx dynamic Yes 0 Gi3/7
* 888 xxxx.xxxx.xxxx static Yes - Switch
* 12 xxxx.xxxx.xxxx dynamic Yes 0 Gi3/24

ASKER CERTIFIED SOLUTION

Istvan Kalmar

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SOLUTION

eeRoot

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Dragon0x40

ASKER

The age appears to be counting up from 0? If not wouldn't the entries with age 0 be gone? Everytime the mac communicates the timer is reset to 0?

I thought static mac entry meant that the mac was associated with a specific physcial port?

Layer 2 or 3 protocol detected on which port? No port is listed?

SOLUTION

eeRoot

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Dragon0x40

ASKER

So age of 0 means it has 300 more seconds before timing out?

Age of 105 means it 195 more seconds before it ages out of the mac-address-table?

Assuming the default aging time of 300 seconds is still in effect.

eeRoot

correct