|
Posted by vicky on May 24, 2008, 2:08 am
If you were Registered and logged in, you could reply and use other advanced thread options
If a layer 2 switch is using IEEE 802.1q compatibility, then is it
support both ieee 802.1q and port-based vlan compatibility ???
|
 
| |
Posted by Michelot on May 30, 2008, 5:56 am
If you were Registered and logged in, you could reply and use other advanced thread options
Bonjour Vicky,
> If a layer 2 switch is using =A0IEEE 802.1q compatibility, then is it
> support both ieee 802.1q and port-based vlan compatibility ???
I'm not really an expert of that, but I can see that nobody replies to
that interresting question.
A VLAN-aware bridge is a bridge specified by 802.1Q.
As you can read in the section 5.4 of the specification:
"An implementation of a VLAN-aware Bridge may support Port-and-
Protocol-based VLAN classification (5.3.1.2), including multiple VID
(VLAN identifiers) values per port, administrative control of the
values of the multiple VIDs, and a Protocol Group Dat."
Best regards,
Michelot
|
|
Posted by vicky on May 31, 2008, 2:18 am
If you were Registered and logged in, you could reply and use other advanced thread options > Bonjour Vicky,
>
> > If a layer 2 switch is using IEEE 802.1q compatibility, then is it
> > support both ieee 802.1q and port-based vlan compatibility ???
>
> I'm not really an expert of that, but I can see that nobody replies to
> that interresting question.
>
> A VLAN-aware bridge is a bridge specified by 802.1Q.
>
> As you can read in the section 5.4 of the specification:
>
> "An implementation of a VLAN-aware Bridge may support Port-and-
> Protocol-based VLAN classification (5.3.1.2), including multiple VID
> (VLAN identifiers) values per port, administrative control of the
> values of the multiple VIDs, and a Protocol Group Dat."
>
> Best regards,
> Michelot
----------------------------------
Thanks a lot for responding
One thing i want to ask....
One of my question is comes when i read a switch data sheet here this
line is mentioned....
If both the VID and MAC Address are used , a single MAC address is
able to be a member of multiple VLANs simentaniously......
Please help me to clarify this statement.....
Thanks in advance..........
|
|
Posted by Michelot on May 31, 2008, 8:17 am
If you were Registered and logged in, you could reply and use other advanced thread options
> If both the VID and MAC Address are used , a single MAC address is
> able to be a member of multiple VLANs simentaniously......
We don't know all the context, so we can imagine one possibility. It
exists surely other possibilities of interpretation.
Suppose just one switch, with e.g; 24 port-based VLAN, connected to
terminal stations that send no-tagged Ehernet frames.
The station S1 is connected to the port P2 configured to belong to the
VLAN V3. Other switch ports are also configured with the VLAN V3, e.g.
P7 and P20.
Suppose S1 sends a (classical) Ethernet frame to reach the destination
address DA7. And, it is the first sending with that address.
The switch broadcasts the frame into all the VLAN V3 (except to the
sender S1), that are stations connected to P7 and P20. If the station
S4 connected to P20 e.g. replies, its address is registered in the
self learning table with that information: S4/V3/SA4 (source address
of S4).
After that, when S1 sends frames to S4, the switch has no need to
broadcast these frames into V3. The communication works point to point
in V3.
This is the normal use.
But you can complicate a little bit. You can configure (if the switch
allows that) that P2, where is S1, belongs to V3, V5 and V11. And P20,
where is S4, belongs to V3, V5 and V33.
- If S4 (with DA4) is connected to P20/V3 (the previous case) it
works.
- If I move S4 to P9/V5 it works also.
- If I move S4 to P4/V56, S1 will never communicate directly through
Ethernet with S4.
- If I move S4 to P23/V33, the communication between S1 and S4 doesn't
work (through Ethernet).
S4 is a member of V3, V5, V33 and the communication is possible is the
source belongs to those VLAN.
These both examples are the level 1 of VLAN, with no need to exchange
tagged Ethernet frames.
Best regards,
Michelot
|
|
Posted by Michelot on May 31, 2008, 8:25 am
If you were Registered and logged in, you could reply and use other advanced thread options > S4 is a member of V3, V5, V33 and the communication is possible is the
> source belongs to those VLAN.
Sorry, "the communication is possible is the source belongs to one of
those VLAN".
Michelot
|
| Similar Threads | Posted | | VLAN Help (for a Vlan newbie) | November 6, 2006, 12:09 pm |
| port-based vlan and tag-based vlan | October 21, 2008, 2:03 pm |
| port-based vlan and tag-based vlan | October 21, 2008, 2:03 pm |
| VLAN | December 13, 2005, 10:23 am |
| VLAN and VPN | January 17, 2007, 1:05 pm |
| VPN Vs VLAN | December 21, 2007, 3:54 pm |
| mac vlan | September 29, 2008, 10:14 am |
| VLAN and Subnet | March 27, 2005, 1:31 pm |
| VLAN Configuration | October 20, 2005, 8:26 pm |
| Confused by VLAN... | January 31, 2006, 6:25 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML site map