Cisco Catalyst 6500 Supervisor 2T Architecture - Ipland
Cisco Catalyst 6500 Supervisor 2T Architecture - Ipland Cisco Catalyst 6500 Supervisor 2T Architecture - Ipland
White PaperSwitch Fabric ArchitectureThe Supervisor 2T Switch Fabric implements two identical crossbar switch fabrics. Each crossbar is used to handleeither high priority or low priority traffic. This is shown in the following diagram.Figure 14.Supervisor 2T Crossbar ArchitectureWhen a linecard forwards a packet over its fabric port, it is received by the fabric and stored in the fabric ports inputbuffer. The input buffer on the ingress fabric port contains a high priority queue and a low priority queue. When apacket arrives on the ingress fabric port, it is demultiplexed into one of the two queues, depending on the priorityassigned to it. The assignment of the packet into one of the two queues provides the determination of which fabricthe packet will traverse (the high priority or the low priority fabric).Within the packet header is a Fabric Port of Exit (FPOE) index field, which indicates the switch fabric port of exit. Theswitch fabric will arbitrate for output buffers associated with that egress fabric port. Once the arbitration is successful,the packet data will flow from the ingress packet buffer on the ingress fabric port to the egress packet buffers on theegress fabric port. During this transmission, a three-times-over-speed is used to minimize switching latency andreduce Head of Line Blocking (HOLB) contention. Once the entire data packet has been received by the egressfabric interface ASIC and is fully stored in the egress fabric port buffers, it is then transmitted by the egress linecard.Fabric Connection Daughter CardThe Supervisor 720 supported only 20 fabric channels (18 for linecards, two for Supervisor uplinks). When wasinstalled in the 6513, it limited the top eight slots to a single channel only. This limited linecard options for Slots 1through 8, restricting dual fabric linecards (WS-X67xx) to being inserted in Slots 9 through 13 only. The crossbarswitch fabric on the Supervisor 2T and the 6513-E chassis address this limitation.With this chassis and Supervisor combination, all linecard slots (Slots 1 through 6 and Slots 9 through 13) have dualfabric channels built into the chassis, allowing dual fabric linecards (WS-X67xx, WS-X68xx and WS-69xx) to operatein all slots. The fabric connection daughter card is a new addition on the Supervisor baseboard. This daughter cardprovides connection for 6 additional channels across Slots 1 through 6 that were missing in the original 6513. Thiscan be seen in the following diagram.© 2011-2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Partner Confidential Information. Page 44 of 46
White PaperFigure 15.Fabric Connection Daughter Card (FCDC)The diagram above shows the FCDC from the rear of the Supervisor 2T. It provides a second connector that sits justabove the original fabric connector found on earlier Supervisor 720 models. For all chassis models (except the 6513-E), this connector does not play a part in provisioning fabric channels to any of the linecard slots. In the 6513-E,there is an additional connector found for Slots 7 and 8 on the chassis backplane that is used by the FCDC. Thisadditional backplane connector can be seen in the following diagram of the 6513-E.Figure 16.Catalyst 6513-E Backplane ConnectorsThis additional slot connector allows the 6 additional fabric channels to be relayed to the first six linecard slots in the6513-E, thus providing dual fabric channel connections to all linecard slots.© 2011-2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Partner Confidential Information. Page 45 of 46
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White PaperSwitch Fabric <strong>Architecture</strong>The <strong>Supervisor</strong> <strong>2T</strong> Switch Fabric implements two identical crossbar switch fabrics. Each crossbar is used to handleeither high priority or low priority traffic. This is shown in the following diagram.Figure 14.<strong>Supervisor</strong> <strong>2T</strong> Crossbar <strong>Architecture</strong>When a linecard forwards a packet over its fabric port, it is received by the fabric and stored in the fabric ports inputbuffer. The input buffer on the ingress fabric port contains a high priority queue and a low priority queue. When apacket arrives on the ingress fabric port, it is demultiplexed into one of the two queues, depending on the priorityassigned to it. The assignment of the packet into one of the two queues provides the determination of which fabricthe packet will traverse (the high priority or the low priority fabric).Within the packet header is a Fabric Port of Exit (FPOE) index field, which indicates the switch fabric port of exit. Theswitch fabric will arbitrate for output buffers associated with that egress fabric port. Once the arbitration is successful,the packet data will flow from the ingress packet buffer on the ingress fabric port to the egress packet buffers on theegress fabric port. During this transmission, a three-times-over-speed is used to minimize switching latency andreduce Head of Line Blocking (HOLB) contention. Once the entire data packet has been received by the egressfabric interface ASIC and is fully stored in the egress fabric port buffers, it is then transmitted by the egress linecard.Fabric Connection Daughter CardThe <strong>Supervisor</strong> 720 supported only 20 fabric channels (18 for linecards, two for <strong>Supervisor</strong> uplinks). When wasinstalled in the 6513, it limited the top eight slots to a single channel only. This limited linecard options for Slots 1through 8, restricting dual fabric linecards (WS-X67xx) to being inserted in Slots 9 through 13 only. The crossbarswitch fabric on the <strong>Supervisor</strong> <strong>2T</strong> and the 6513-E chassis address this limitation.With this chassis and <strong>Supervisor</strong> combination, all linecard slots (Slots 1 through 6 and Slots 9 through 13) have dualfabric channels built into the chassis, allowing dual fabric linecards (WS-X67xx, WS-X68xx and WS-69xx) to operatein all slots. The fabric connection daughter card is a new addition on the <strong>Supervisor</strong> baseboard. This daughter cardprovides connection for 6 additional channels across Slots 1 through 6 that were missing in the original 6513. Thiscan be seen in the following diagram.© 2011-2012 <strong>Cisco</strong> and/or its affiliates. All rights reserved. This document is <strong>Cisco</strong> Partner Confidential Information. Page 44 of 46
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