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Updated:July 30, 2015
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The Cisco ASR 901 Series Aggregation Services Router is a cell-site access platform specifically designed to aggregate and transport mixed-generation radio access network (RAN) traffic. The router is used at the cell site edge as a part of a 2G, 3G, or 4G RAN.
The Cisco ASR 901 router helps enable a variety of RAN solutions by extending IP connectivity to devices using Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Node Bs using High Speed Packet Access (HSPA) or Long Term Evolution (LTE), base transceiver stations (BTSs) using Enhanced Data Rates for GSM Evolution (EDGE), Code Division Multiple Access (CDMA), CDMA-2000, EVDO, or WiMAX, and other cell-site equipment.
It transparently and efficiently transports cell-site voice, data, and signaling traffic over IP using traditional T1 and E1 circuits, as well as alternative backhaul networks such as Carrier Ethernet and DSL, Ethernet in the First Mile (EFM), and WiMAX. It also supports standards-based Internet Engineering Task Force (IETF) Internet protocols over the RAN transport network, including those standardized at the Third-Generation Partnership Project (3GPP) for IP RAN transport. Custom designed for the cell site, the Cisco ASR 901 router features a small form factor, extended operating temperature, and cell-site DC input voltages.
Table 1 lists the Cisco ASR 901 1G Router model versions.
Table 1 Cisco ASR 901 1G Router Models
TDM + Ethernet Version
Table 2 lists the Cisco ASR 901 10G Router model versions.
Table 2 Cisco ASR 901 10G Router Models
TDM + Ethernet Version
Note Some of the Cisco ASR 901 models have port based licensing. For more details, see the Licensing chapter in Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide.
System Specifications and Memory Details
Table 3 lists the supported system configurations and memory details for the Cisco ASR 901 router:
Table 3 Cisco IOS Release 15.5(3)S Memory Details
Cisco ASR 901 Series Aggregation Services Router TDM version
Cisco ASR 901 Series Aggregation Services Router, Ethernet version
Cisco ASR 901 Series Aggregation Services Router, IPsec enabled Ethernet version
Determining the Software Version
To determine the image and version of Cisco IOS software running on your Cisco ASR 901 router, log in to the router and enter the show version command in the EXEC mode:
The following example shows output from Cisco ASR 901 router that supports normal IOS software.
ASR901_1> show version
Cisco IOS Software, 901 Software (ASR901-UNIVERSALK9-M), Version 15.5(3)S, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Fri 24-Jul-15 10:37 by prod_rel_team
The following example shows output from Cisco ASR 901 Series Aggregation Services Router, IPsec enabled Ethernet version.
SANR1> show version
Cisco IOS Software, 901 Software (ASR901SEC-UNIVERSALK9-M), Version 15.5(3)S, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2015 by Cisco Systems, Inc.
There are no new hardware features in this release.
New Software Features in Release 15.5(3)S
The following features are supported from this release.
BCM Parity Errors
BCM Parity Errors feature detects and recovers from parity errors which may get generated on Cisco ASR901 routers due to environmental conditions.
These parity errors, when get detected, generate following type of logs on the device –
unit 0 <TableName> entry <entryId> parity error
This feature automatically recovers parity error on a subset of the table. Therefore, if parity errors in above format are observed on some table, then please contact Cisco TAC for assistance.
HSRP Version 2
This feature uses the new IP multicast address 18.104.22.168 to send hello packets instead of the multicast address of 22.214.171.124, used by HSRP version 1. This new multicast address allows CGMP leave processing to be enabled at the same time as HSRP.
HSRP version 2 permits an expanded group number range, 0 to 4095, and consequently uses a new MAC address range 0000.0C9F.F000 to 0000.0C9F.FFFF. The expanded group number range was changed to allow the group number to match the VLAN number on sub interfaces. This feature allows the router to advertise and learn millisecond timer values. HSRP version 2 packet includes a 6-byte identifier field that is used to uniquely identify the sender of the message (usually populated with interface MAC address).
For detailed information about this feature, see HSRP Version 2 feature at the following URL:
This feature provides the capability to filter packets at a fine granularity and allows the permission or denial of the packets based on the MAC source and destination addresses. MAC Access Control Lists (ACLs) are ACLs that filter traffic using information in the layer 2 header of each packet. This ability to filter packets in a modular and scalable way is important for both network security and network management.
For more information about this feature, see Layer 2 MAC ACLs feature guide at the following URL:
This feature introduces support for IP Security (IPsec) traffic to travel through Network Address Translation (NAT) or Port Address Translation (PAT) points in the network by addressing many known incompatibilities between NAT and IPsec. This feature encapsulates the IPsec packets in a User Datagram Protocol (UDP) wrapper that allows the packets to travel across NAT devices.
For information about this feature, see NAT Traversal feature guide at the following URL:
The Cisco ASR 901 router supports the following MIBs:
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels. Only select severity 3 caveats are listed.
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Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.