61pVLAN Edge (Protected Port) FeatureThe PVLAN edge (protected port) feature has only local significance to the switch (unlike pVLANs), and there is no isolation provided between two protected ports located on different switches. A protected port does not forward any traffic to any other port that is also a protected port on the same switch.Traffic cannot be forwarded between protected ports at L2, all traffic passing between protected ports must be forwarded through an L3 device.Switch(config-if)# switchport protected
62Configuring Link Aggregation with Etherchannel
63EtherChannel TechnologyUp to 8 physical links can be bundled into a single logical EtherChannel link.Usually EtherChannel is used for trunk links.Configuration applied to port channel interface affects all physical interfaces assigned to the port channel.Load balancing takes place between the physical links in an EtherChannel.EtherChannels can be L2 or L3 interfaces.
64EtherChannel Management ProtocolsPort Aggregation Protocol (PAgP)is a Cisco-proprietary protocol that aids in the automatic creation of Fast EtherChannel links. •When an EtherChannel link is configured using PAgP, PAgP packets are sent between Fast EtherChannel-capable ports to negotiate the forming of a channel.•When PAgP identifies matched Ethernet links, it groups the links into an EtherChannel. Spanning tree adds the EtherChannel as a single bridge port.Link Aggregation Control Protocol (LACP) is part of an IEEE specification (802.3ad) that also enables several physical ports to be bundled together to form an EtherChannel. •LACP enables a switch to negotiate an automatic bundle by sending LACP packets to the peer. •It performs a similar function as PAgP with Cisco EtherChannel. •Because LACP is an IEEE standard, you can use it to facilitate EtherChannels in mixed-switch environments. In a Cisco environment, both protocols are supported.
65PAgP ModesModePurposeAutoPlaces an interface in a passive negotiating state in which the interface responds to the PAgP packets that it receives but does not initiate PAgP negotiation (default). DesirablePlaces an interface in an active negotiating state in which the interface initiates negotiations with other interfaces by sending PAgP packets. Interfaces configured in the “on” mode do not exchange PAgP packets.OnForces the interface to channel without PAgP. Non-silentIf a switch is connected to a partner that is PAgP-capable, configure the switch interface for non-silent operation. The non-silent keyword is always used with the auto or desirable mode.
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VLAN Trunking Protocol, Trunking, IP switching, Configure VLANs