Re: Strange results from a tcpdump, can anyone help?


maethlin wrote:
So Bert, to answer your question, I'm looking at some of the packets
(that were supposed to go outside the vlan) and the MAC DA on them
seems to be the core switch interface (all the access switches I am
discussing are plugged into a core switch). So yes, it would seem that
traffic destined to the core is somehow showing up at other ports - in
this case almost every port on that vlan.

At the time when the problem happens, look at the switch's forwarding
table and see if the MAC address of the router has been learned there.

Anoop

.

Relevant Pages

  • Re: assigning MAC address to a VLAN
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    (comp.dcom.lans.ethernet)
  • Re: assigning MAC address to a VLAN
    ... There are port based VLANs in which you specify the switch ports to associate with a given VLAN. ... Devices connected to those ports will be in a common VLAN. ... There are MAC address based VLAN's where you associate the MAC addresses of hosts with the VLAN. ...
    (comp.dcom.lans.ethernet)
  • Re: assigning MAC address to a VLAN
    ... There are port based VLANs in which you specify the switch ports to ... associate with a given VLAN. ... MAC addresses of hosts with the VLAN. ... what is the use of assigning a MAC address to a VLAN??? ...
    (comp.dcom.lans.ethernet)
  • Re: Strange results from a tcpdump, can anyone help?
    ... and the MAC DA on them ... discussing are plugged into a core switch). ... traffic destined to the core is somehow showing up at other ports - in ... this case almost every port on that vlan. ...
    (comp.dcom.lans.ethernet)
  • Re: Strange results from a tcpdump, can anyone help?
    ... discussing are plugged into a core switch). ... The MAC DA for all frames addressed to hosts outside the source host's IP subnet should be the MAC address of the router, not the MAC address of any intervening switch. ... A Bridge is not directly addressed by communicating end stations, except as an end station for management purposes-frames transmitted between end stations carry the MAC Address of the peer-end station in their Destination Address field, not a MAC Address of the Bridge. ...
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