| 32 | | * generating layer-2 traffic to a given IP address. This allows for switches's MAC-port tables to be inspected for your known path to identify a problem. the example below shows the GPO's MAC showing up in the NLR's Boston switch but not NLR's Seattle switch, which helped diagnose the problem. |
| 33 | | {{{ |
| 34 | | # display our MAC |
| 35 | | [jwilliams@wyverley ~]$ /sbin/ifconfig eth3 | grep HWaddr |
| 36 | | eth3 Link encap:Ethernet HWaddr 00:0C:29:40:45:1D |
| 37 | | |
| 38 | | #generate layer-2 traffic from this MAC |
| 39 | | [jwilliams@wyverley ~]$ sudo /sbin/arping -I eth3 10.37.16.90 |
| 40 | | ARPING 10.37.16.90 from 10.37.16.100 eth3 |
| 41 | | |
| 42 | | #NLR's Boston switch - shows our MAC: |
| 43 | | vlan mac address type learn age ports |
| 44 | | ------+----------------+--------+-----+----------+-------------------------- |
| 45 | | * 3716 000c.2940.451d dynamic Yes 0 Gi9/2 |
| 46 | | * 3716 001b.902e.f4ca dynamic Yes 60 Te1/2 |
| 47 | | |
| 48 | | #NLR's Seattle switch - does NOT show our MAC: |
| 49 | | vlan mac address type learn age ports |
| 50 | | ------+----------------+--------+-----+----------+-------------------------- |
| 51 | | * 3716 3333.0000.0016 static Yes - Switch,Stby-Switch |
| 52 | | }}} |
| 53 | | |
| 54 | | |
| | 32 | |
| | 33 | * generating layer-2 traffic to a given IP address. This allows for switches's MAC-port tables to be inspected for your known path to identify a problem. |
