By Hutton, Keith
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Extra resources for Authorized self-study guide: designing Cisco network service architectures (ARCH)
A device is said to be Cisco NSF capable if it has been configured to support Cisco NSF. A Cisco NSF-capable device rebuilds routing information from Cisco NSF-aware or Cisco NSF-capable neighbors. A Cisco NSF-aware neighbor is needed so that Cisco NSF-capable systems can rebuild their databases and maintain their neighbor adjacencies across a switchover. Following a switchover, the Cisco NSF-capable device requests that the Cisco NSFaware neighbor devices send state information to help rebuild the routing tables as a Cisco NSF reset.
PAgP and LACP do not interoperate. You can manually configure a switch with PAgP on one side and LACP on the other side in the on/on mode. When this is done, ports configured in the on mode do not negotiate, and therefore there is no negotiation traffic between the ports. This configuration results in the EtherChannel being hard-coded. When connecting a Cisco IOS Software device to a Catalyst operating system device, make sure that the PAgP settings used for establishing EtherChannels are coordinated.
The benefits of dynamic propagation of VLAN information across the network are not worth the potential for unexpected behavior due to operational error. For these reasons, VTP transparent mode is the recommended configuration option. Dynamic Trunking Protocol DTP provides switch ports to negotiate the trunking method with another device and to automatically allow a link to become a trunk. With Cisco devices, there are five Layer 2 port modes: • • • • • Trunk: Puts the port into permanent trunking mode and negotiates to convert the link into a trunk link.