Cisco Systems 3130 User Manual
15-9
Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter 15 Configuring Private VLANs
Configuring Private VLANs
Limitations with Other Features
When configuring private VLANs, remember these limitations with other features:
Note
In some cases, the configuration is accepted with no error messages, but the commands have no effect.
•
Do not configure fallback bridging on switches with private VLANs.
•
When IGMP snooping is enabled on the switch (the default), the switch or switch stack supports no
more than 20 private-VLAN domains.
more than 20 private-VLAN domains.
•
Do not configure a remote SPAN (RSPAN) VLAN as a private-VLAN primary or secondary VLAN.
For more information about SPAN, see
•
Do not configure private-VLAN ports on interfaces configured for these other features:
–
dynamic-access port VLAN membership
–
Dynamic Trunking Protocol (DTP)
–
Port Aggregation Protocol (PAgP)
–
Link Aggregation Control Protocol (LACP)
–
Multicast VLAN Registration (MVR)
–
voice VLAN
–
Web Cache Communication Protocol (WCCP)
•
You can configure IEEE 802.1x port-based authentication on a private-VLAN port, but do not
configure 802.1x with port security, voice VLAN, or per-user ACL on private-VLAN ports.
configure 802.1x with port security, voice VLAN, or per-user ACL on private-VLAN ports.
•
A private-VLAN host or promiscuous port cannot be a SPAN destination port. If you configure a
SPAN destination port as a private-VLAN port, the port becomes inactive.
SPAN destination port as a private-VLAN port, the port becomes inactive.
•
If you configure a static MAC address on a promiscuous port in the primary VLAN, you must add
the same static address to all associated secondary VLANs. If you configure a static MAC address
on a host port in a secondary VLAN, you must add the same static MAC address to the associated
primary VLAN. When you delete a static MAC address from a private-VLAN port, you must remove
all instances of the configured MAC address from the private VLAN.
the same static address to all associated secondary VLANs. If you configure a static MAC address
on a host port in a secondary VLAN, you must add the same static MAC address to the associated
primary VLAN. When you delete a static MAC address from a private-VLAN port, you must remove
all instances of the configured MAC address from the private VLAN.
Note
Dynamic MAC addresses learned in one VLAN of a private VLAN are replicated in the
associated VLANs. For example, a MAC address learned in a secondary VLAN is replicated
in the primary VLAN. When the original dynamic MAC address is deleted or aged out, the
replicated addresses are removed from the MAC address table.
associated VLANs. For example, a MAC address learned in a secondary VLAN is replicated
in the primary VLAN. When the original dynamic MAC address is deleted or aged out, the
replicated addresses are removed from the MAC address table.
•
Configure Layer 3 VLAN interfaces (SVIs) only for primary VLANs.