Bandwidth Oversubscription; C H A P T E R 3 Catalyst 6500 Series Switch Spa Overview - Cisco Catalyst 6500 Series Hardware Installation Manual

Chapter 3 Catalyst 6500 Series Switch SPA Overview
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Bandwidth Oversubscription

Oversubscribing the bandwidth limit recommendations of a router can result in decreased or degraded
performance. For this reason, it is important to determine the amount of bandwidth used by the SPAs on
the router and verify that the total bandwidth used by all SPAs does not exceed the recommended
bandwidth limit of the router. It is also important not to exceed the bandwidth of the SIP. For information
on SIP bandwidth, see
Table 3-2
as the cumulative bandwidth (total bandwidth) for all ports available on the SPA.
Table 3-2
SPA
2-Port Channelized T3 SPA
4-Port Channelized T3 SPA
8-Port Channelized T1/E1 SPA
2-Port OC-3c/STM-1 ATM SPA
4-Port OC-3c/STM-1 ATM SPA
1-Port Channelized STM-1/OC-3 SPA 155 Mbps
1-Port OC-48c/STM-16 ATM SPA
2-Port OC-3c/STM-1 POS SPA
4-Port OC-3c/STM-1 POS SPA
1-Port OC-12c/STM-4 POS SPA
1-Port OC-192c/STM-64 POS/RPR
SPA
1-Port OC-192c/STM-64 POS/RPR
XFP SPA
1-Port OC-192c/STM-64 POS/RPR
VSR Optics SPA
2-Port Clear Channel T3/E3 SPA
4-Port Clear Channel T3/E3 SPA
1-Port 10-Gigabit Ethernet SPA
2-Port Gigabit Ethernet SPA
OL-9041-04
Chapter 2, "SIP and SSC Support."
provides information about the bandwidth for each port (per-port bandwidth) on a SPA, as well
SPA Bandwidth Capacity
Catalyst 6500 Series Switch SIP, SSC, and SPA Hardware Installation Guide
Number of
Per-Port Bandwidth Ports
44.736 Mbps 2
44.736 Mbps 4
1.544 Mbps (T1) 8
2.048 Mbps (E1)
155.52 Mbps 2
155.52 Mbps 4
1
2488 Mbps 1
155.52 Mbps 2
155.52 Mbps 4
622.08 Mbps 1
9.95 Gbps 1
9.95 Gbps 1
9.95 Gbps 1
44.736 Mbps (T3) 2
34.368 Mbps (E3)
44.736 Mbps (T3) 4
34.368 Mbps (E3)
10 Gbps 1
10 Gbps 2

Bandwidth Oversubscription

Total Bandwidth
89.47 Mbps
178.94 Mbps
12.35 Mbps (T1)
16.38 Mbps (E1)
311.04 Mbps
622.08 Mbps
155 Mbps
2488 Mbps
311.04 Mbps
622.08 Mbps
622.08 Mbps
9.95 Gbps
9.95 Gbps
9.95 Gbps
89.47 Mbps (T3)
68.74 Mbps (E3)
178.94 Mbps (T3)
137.47 Mbps (E3)
10 Gbps
20 Gbps
3-3