3-2
Cisco CRS-1 Carrier Routing System SIP and SPA Hardware Installation Guide
OL-17439-01
Chapter 3 Overview: Cisco CRS-1 Shared Port Adapters
Bandwidth Oversubscription
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 the
“SIP Summary” section on page 2-1
.
The processing on the Cisco CRS-1 SIP-800 is performed by two PLIM ASICs, each of which can
process up to 20 Gbps of traffic. SPA subslots 0, 1, and 3 are associated with one PLIM ASIC, while
SPA subslots 2, 4, and 5 are associated with the second PLIM ASIC. See
Figure 3-1
for subslot locations.
Figure 3-1
Cisco CRS-1 SIP-800 Slot Locations
8-Port OC-12c/STM-4 Multirate POS SPA
SPA-8XOC12-POS
8
Release 3.3.0
1.0
2-Port OC-48c/STM-16 POS/RPR SPA
SPA-2XOC48POS/RPR
2
Release 3.4.0
1.0
4-Port OC-48c/STM-16 POS/RPR SPA
SPA-4XOC48POS/RPR
4
Release 3.4.0
1.0
1-Port OC-192c/STM-64 POS/RPR XFP SPA
SPA-OC192POS-XFP
1
Release 3.2
1.0
1-Port OC-192c/STM-64 POS/RPR VSR Optics SPA SPA-OC192POS-VSR
1
Release 3.4.1
1.0
5-Port Gigabit Ethernet SPA
SPA-5X1GE-V2
5
Release 3.4.0
1.0
8-Port Gigabit Ethernet SPA
SPA-8X1GE
SPA-8X1GE-V2
8
Release 3.2
Release 3.4.0
1.0
10-Port Gigabit Ethernet SPA
SPA-10X1GE-V2
10
Release 3.4.0
1.0
1-Port 10-Gigabit Ethernet SPA
SPA-1X10GE-L-V2
SPA-1X10GE-WL-V2
1
Release 3.4.0
Release 3.5.0
1.0
2-Port Clear Channel T3/E3 SPA
SPA-2XT3/E3
2
Release 3.4.1
1.0
4-Port Clear Channel T3/E3 SPA
SPA-4XT3/E3
4
Release 3.4.1
1.0
Table 3-1
SPA Summary (continued)
SPA
SPA Part Number
Number
of Ports
Minimum Cisco
IOS XR Software
Minimum
Hardware
Revision
1
Subslots controlled by one PLIM ASIC
2
Subslots controlled by second PLIM ASIC
129443
subslot 3
subslot 4
subslot 5
subslot 0
subslot 1
subslot 2
1
2