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Cisco switches behave differently in this scenario, depending on the hardware platforms and
OS versions.
Table 70: Cisco hardware characteristics
with a sample of hardware platforms and OS versions.
Table 70: Cisco hardware characteristics
Hardware platform /
operating system
Catalyst 6509
with CatOS 6.1(2)
Catalyst 4000
with CatOS 6.3(3)
Catalyst 3500XL
with IOS
12.0(5)WC2
Conclusion
Note:
Setting a Layer 2 priority is only useful if QoS is enabled on the Ethernet switch.
Note:
Otherwise, the priority-tagged frames are treated no differently than clear frames.
See
IP addressing
This section covers:
Overview of IP addressing
1918, CIDR/VLSM
DHCP
Recommendations for IP Telephony
Laboratory test results
Accepted VID zero for the native VLAN when 802.1Q
trunking was enabled on the port. In this case, all but the
native VLAN should be cleared off the trunk.
Did not accept VID zero for the native VLAN. Opened a
case with Cisco TAC, and TAC engineer said it was a
hardware problem in the 4000. Bug ID is CSCdr06231.
Workaround is to enable 802.1Q trunking, and tag with
native VID instead of zero. Again, clear all but the native
VLAN off the trunk.
Accepted VID zero for the native VLAN when 802.1Q
trunking was disabled on the port.
Note the hardware platform and the OS version, and consult
the Cisco documentation, or call TAC.
Multi-VLAN example
for an example.
of IP addressing concepts, including classful addresses, RFC
shows Avaya's laboratory test results
Issue 3.4.1 June 2005
IP addressing
289
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