Design Review Template - NETS

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Hierarchical (MultiLayer) Network Design Off Auto (Default) Desirable Non-silent (Default on 5k fiber FE and GE ports) Silent (Default on all 6k and 4k ports, and 5k copper ports) peer port is configured. If the peer port mode is on, a channel is formed. The port is not channeling regardless of how the peer port is configured. Aggregation is under control of the PAgP protocol. Places a port into a passive negotiating state and no PAgP packets are sent on the interface until at least one PAgP packet is received that indicates that the sender is operating in desirable mode. Aggregation is under control of the PAgP protocol. Places a port into an active negotiating state, in which the port initiates negotiations with other ports by sending PAgP packets. A channel is formed with another port group in either desirable or auto mode. An auto or desirable mode keyword. If no data packets are received on the interface, then the interface is never attached to an agport and cannot be used for data. This bi-directionality check was provided for specific Cat5k hardware (EBC and SAINT4/5 ASICS), as some link failures result in the channel being broken apart and is to be avoided. More flexible bundling and improved bi-directionality checks are present by default in the 4k and 6k hardware. See section on auto-negotiation. F2H1A0C4 An auto or desirable mode keyword. If no data packets are received on the interface, then after a 15s timeout period, the interface is attached by itself to an agport and can thus be used for data transmission. Silent mode also allows for channel operation when the partner can be an analyzer or server that never sends PAgP. AS recommends enabling PAgP on all switch-to-switch channel connections (ie. avoid the mode ‘on’). The preferred way is to set ‘desirable mode’ at both ends of a link. The additional recommendation is to allow the ‘silent/non-silent’ keyword to default, i.e. silent on 6ks and 4ks, non-silent on 5k fiber ports. As discussed in previous sections, explicitly configuring channeling off on all other port is helpful for rapid data forwarding as ports come up. Waiting up to 15s for PAgP to timeout on a port that will not be used for channeling should be avoided, especially as the port is then handed over to STP which itself can take 30s to allow data forwarding, 45s in total. set port channel mode desirable set port channel mode off! where ports not in use, part of the ! set port host macro. NCAR Design Review and Recommendations v1.0 22
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Page 1 and 2: Cisco Systems Advanced Services Nat
Page 3 and 4: Contents Contents 3 Document Contro
Page 5 and 6: About The Document Document Purpose
Page 7 and 8: About The Document and Foothills. A
Page 9 and 10: Short Term Design Enhancements Foot
Page 11 and 12: Hierarchical (MultiLayer) Network D
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