Bandwidth Oversubscription - Cisco 12000 - Series Chassis Modular Expansion Base Hardware Installation Manual

Chapter 2 Overview: Cisco 12000 Series Router Shared Port Adapters
Access to this tool is limited to users with Cisco.com login accounts.
Note
To access Software Advisor, click Login at Cisco.com, type "Software Advisor" in the SEARCH box,
and click GO. Click the link for the Software Advisor tool.
Choose a product family or enter a specific product number to search for the minimum supported
software release needed for your hardware.

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.
Table 2-2
as the cumulative bandwidth (total bandwidth) for all ports available on the SPA.
Table 2-2
SPA
2-Port Channelized T3 SPA
4-Port Channelized T3 SPA
2-Port Clear Channel T3/E3 SPA
4-Port Clear Channel T3/E3 SPA
8-Port Channelized T1/E1 SPA
1-Port 10-Gigabit Ethernet SPA
2-Port Gigabit Ethernet SPA
5-Port Gigabit Ethernet SPA
10-Port Gigabit Ethernet SPA
1-Port OC-48c/STM-16 POS SPA
1-Port OC-192c/STM-64 POS SPA
2-Port OC48-POS/RPR SPA
2-Port OC-3c/STM-1 and OC-12c/STM-4
POS SPA
4-Port OC-3c/STM-1 and OC-12c/STM-4
POS SPA
8-Port OC-3c/STM-1 and OC-12c/STM-4
POS SPA
Release 12.0(32)SY1, OL-8831-01, Rev. G6, July 19, 2007
provides information about the bandwidth for each port (per-port bandwidth) on a SPA, as well
SPA Bandwidth Capacity
Per-Port Bandwidth
44.736 Mbps
44.736 Mbps
44.736 Mbps (T3)
34.368 Mbps (E3)
44.736 Mbps (T3)
34.368 Mbps (E3)
1.544 Mbps (T1)
2.048 Mbps (E1)
10 Gbps
1 Gbps
1 Gbps
1 Gbps
2.488 Gbps
9.953 Gbps
2.488 Gbps
155.52 Mbps or
622.08 Mbps
155.52 Mbps or
622.08 Mbps
155.52 Mbps or
622.08 Mbps
Cisco 12000 Series Router SIP and SPA Hardware Installation Guide

Bandwidth Oversubscription

Number
of Ports Total Bandwidth
2 89.47 Mbps
4 178.94 Mbps
2 89.47 Mbps (T3)
68.74 Mbps (E3)
4 178.94 Mbps (T3)
137.47 Mbps (E3)
8 12.35 Mbps (T1)
16.38 Mbps (E1)
1 10 Gbps
2 2 Gbps
5 5 Gbps
10 10 Gbps
1 2.488 Gbps
1 9.953 Gbps
2 4.976 Gbps
2 1.244 Gbps
4 2.488 Gbps
1
8 5 Gbps
2-3