Table Of Contents
Release Notes for the Cisco 800 Series Routers for Cisco IOS Release 12.1(5)YB
Cisco 827 and Cisco 827-4V Routers
Determining Your Software Release
Upgrading to a New Software Release
New Software Features in Release 12.1(5)YB
New Software Features in Release 12.1(1)
Cisco 800 Series Router Supported MIBs
Cisco 820 Series Router Supported MIBs
Cisco 800 Series Memory Management When Using WFQ
Cisco 800 Series Router Clock—CSCdp09409
Cisco 800 Series Router Enhancements
Excessive ISDN Line Activation
Multilink PPP and Interleaving
NAT Support for H.323 Signaling
Phone Mate Answering Machine Model 9200
PPP over Frame Relay Support (RFC-1973)
ROM Monitor set stop-bits Parameter
Resolved Caveats - Release 12.1(5)YB5
Resolved Caveats - Release 12.1(5)YB4
Caveats for Release 12.1(5)YB3
Resolved Caveats for Release 12.1(5)YB3
Unresolved Caveats for Release 12.1(5)YB3
Resolved Caveats for Release 12.1(5)YB1
Cisco IOS Software Documentation Set
Release 12.1 Documentation Set
Obtaining Technical Assistance
Contacting TAC by Using the Cisco TAC Website
Release Notes for the Cisco 800 Series Routers for Cisco IOS Release 12.1(5)YB
February 18, 2002
These release notes describe new features and significant software components for the Cisco 800 Series Routers that support Cisco IOS Release 12.1(5)YB, up to and including Release 12.1(5)YB5. These release notes are updated as needed to describe new memory requirements, new features, new hardware support, software platform deferrals, microcode or modem code changes, related document changes, and any other important changes. Use these release notes with the Cross-Platform Release Notes for Cisco IOS Release 12.1 located on Cisco.com and the Documentation CD-ROM.
For a list of the software caveats that apply to Release 12.1(5)YB5, refer to the section "Caveats" and to the online Caveats for Cisco IOS Release 12.1 T document. The caveats document is updated for every 12.1 T maintenance release and is located on Cisco.com and the Documentation CD-ROM.
Contents
These release notes discuss the following topics:
•
Obtaining Technical Assistance
System Requirements
This section describes the system requirements for Release 12.1(5)YB5 and includes the following sections:
•
•
Memory Requirements
This section describes the memory requirements for the Cisco IOS feature sets supported by Release 12.1(5)YB5 on the Cisco 800 Series Routers.
Hardware Supported
Cisco Release 12.1(5)YB5 supports the following Cisco 800 series routers:
•
•
•
For detailed descriptions of new hardware features, see New and Changed Information.
Cisco 801-804 Routers
The Cisco 801-804 routers provide the following key hardware features:
•
•
•
Note
•
•
•
•
Cisco 805 Router
The Cisco 805 router connects small professional offices over serial lines to corporate networks and to the Internet. Table 2 summarizes Cisco 805 router ports.
Table 2 Cisco 805 Router Ports
Ethernet Port
One 10BaseT (RJ-45)
Serial Port
One WAN interface (RS-232, RS-449, RS-530 and RS-530A, V.35, and X.21)
Console Port
RJ-45
The Cisco 805 router provides the following key features:
•
•
•
•
•
•
Cisco 827 and Cisco 827-4V Routers
The Cisco 827 and Cisco 827-4V Series Routers provide the following key hardware features:
•
•
•
•
•
•
•
•
Table 3 lists the supported interfaces for the Cisco 827 and Cisco 827-4V routers.
Determining Your Software Release
To determine the version of Cisco IOS software currently running on your Cisco 800 series router, log in to the router and enter the show version EXEC command. The following sample output from the show version command indicates the version number on the second output line:
router> show versionCisco Internetwork Operating System SoftwareIOS (tm) 800 Software (c800-y6-mw), Version 12.1(5)YB5, RELEASE SOFTWAREAdditional command output lines include more information, such as processor revision numbers, memory amounts, hardware IDs, and partition information.
Upgrading to a New Software Release
For information about upgrading to a new software release, refer to the Cisco IOS Upgrade Ordering Instructions product bulletin located at the following URL: http://www.cisco.com/warp/public/cc/cisco/mkt/ios/prodlit/957_pp.htm.
Alternatively, the Cisco IOS Software page on Cisco.com has a variety of information, including upgrade information, organized by release. If you have a Cisco.com account and log in, you can go directly to: http://www.cisco.com/kobayashi/sw-center/sw-ios.shtml.
If you have a Cisco.com account and log in, you can reach the new software release upgrade page by going to www.cisco.com and following this path: Service & Support: Software Center: Cisco IOS Software: Product Bulletins: Software: General System Software Bulletins: Cisco IOS Upgrade Ordering Instructions, No. 957
You can also reach the Cisco IOS Upgrade Planner, which allows you more flexibility to browse for your preferred software, by going to www.cisco.com and following this path: Service & Support: Software Center: IOS Upgrade Planner.
Feature Set Tables
The Cisco IOS software is packaged in feature sets consisting of software images—depending on the platform. Each feature set contains a specific set of Cisco IOS features. Release 12.1(5)YB5 supports the same feature sets as Releases 12.1 and 12.1 T, but Release 12.1(5)YB5 can include new features supported by the Cisco 800 Series Routers. Table 4 lists the feature sets supported by the Cisco 800 Series Routers.
Table 5 and Table 6 list the features and feature sets supported by the Cisco 801-804 routers in Cisco IOS Release 12.1(5)YB5. Table 7 lists the features and feature sets supported by the Cisco 805 routers in Cisco IOS Release 12.1(5)YB5. Table 8 lists the features and feature sets supported by the Cisco 827 and Cisco 827-4V routers in Cisco IOS Release 12.1(5)YB5.
Each table uses the following conventions:
•
•
•
Note
Table 5 Feature List by Feature Set for the Cisco 801-804 Routers
PAT (NAT Overload)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
NAT
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
NAT with H.323
No
No
No
No
No
No
No
No
Call Forward (Sweden and Finland only)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Call Forward Variable (North America, Denmark, and Finland only)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Call Hold Retrieve (North America, Denmark, and Finland only)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Call Transfer (North America and Finland only)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Call Waiting
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Caller ID Number delivery to POTS ports (North America, Denmark, Sweden, and Finland only)
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Caller ID Name delivery to POTS ports (North America only)
No
No
No
No
No
No
No
No
Caller ID Restriction (Denmark, Finland, and Sweden only)
(3)XG
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Calling Line Identification Restriction (CLIR) - Temporary Mode (Denmark and Finland only)
(3)XG
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Data-Over-Voice Bearer (North America only)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Distinctive Ringing
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
ISDN-Voice Priority
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Prefix Dialing2
(3)XG
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
GRE Tunneling
No
Yes
No
Yes
Yes
Yes
Yes
Yes
NAT
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
PAP, CHAP, MSCHAP, Local Password
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Common Application Programming Interface (CAPI)
(2)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Auto SPID / Switch Detection
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Cisco ConfigMaker
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Cisco FastStep
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Easy IP Phase I and II (IPCP Address Negotiation and DHCP Server)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
TFTP Client and Server
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
OSPF Flooding Reduction
(2)
No
No
No
No
No
No
No
No
AppleTalk
No
No
No
No
No
No
No
No
IP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
IPX
No
No
No
No
No
Yes
No
No
NetBIOS Access Lists
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Transparent Bridging
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Cisco View
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Service Assurance Agent
(3)XG
No
Yes
No
Yes
Yes
Yes
Yes
Yes
SNMP, Telnet, Console Port
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
SNTP
Yes
Yes
Yes
Yes
No
Yes
No
No
Syslog
No
Yes
No
Yes
Yes
Yes
Yes
Yes
BGP
No
No
No
No
No
No
No
No
EGP
No
No
No
No
No
No
No
No
IGRP
No
No
No
No
No
No
No
No
IP Enhanced IGRP (IP-EIGRP)
No
Yes
No
Yes
Yes
Yes
Yes
Yes
IPX Enhanced IGRP (IPX-EIGRP)
No
No
No
No
No
No
No
No
IP Multicast (relay only)
No
Yes
No
Yes
Yes
Yes
Yes
Yes
IP-Policy Routing
No
Yes
No
Yes
Yes
Yes
Yes
Yes
IPXWAN
No
No
No
No
Yes
Yes
No
Yes
OSPF
No
No
No
No
No
No
No
No
RIP, RIPv2, Triggered RIP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
XOT
No
No
No
No
No
No
No
No
AAA Radius
No
No
No
No
No
No
No
No
AAA TACACS+
No
Yes
No
Yes
No
Yes
No
No
Additional Vendor-Proprietary RADIUS Attributes
No
No
No
No
No
No
No
No
Authenticating ACL
No
No
No
No
No
No
No
No
Automated Double Authentication (server functionality)
No
No
No
No
No
No
No
No
Certificate Authority Interoperability
No
No
No
Yes
No
Yes
Yes
Yes
Internet Key Exchange Security Protocol
No
No
No
Yes
No
Yes
Yes
Yes
IPSec Network Security
No
No
No
Yes
Yes
Yes
Yes
Yes
Cisco IOS Firewall Phase I
–
No
No
Yes
Yes
No
Yes
Yes
Yes
–
No
No
Yes
Yes
No
Yes
Yes
Yes
–
No
No
Yes
Yes
No
Yes
Yes
Yes
–
No
No
Yes
Yes
No
Yes
Yes
Yes
IPSec Encryption with 56 bit DES
No
No
No
Yes
No
Yes
No
No
IPSec Encryption with 168 bit DES (3DES)
No
No
No
No
No
No
Yes
Yes
Lock and Key
Yes
Yes
Yes
Yes
No
Yes
No
No
LT2P
No
No
No
Yes
No
Yes
Yes
Yes
Named Method Lists for AAA Authentication & Accounting
No
No
No
No
No
No
No
No
Route and Router Authentication
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Token Card - Double Authentication
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Frame Relay Encapsulation (for ISDN LL and ISDN Dial)
(3)XG
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
ISDN Digital Subscriber Line (IDSL, up to 144 kbps)
(Cisco 802 & Cisco 804 only)Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Frame Relay Inverse ARP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
ISDN
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
ISDN Leased Line (up to 144 kbps)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
ML-PPP, PPP Compression
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
PPP over Frame Relay (RFC 1973)
No
No
No
No
No
No
No
No
Always On/Dynamic ISDN (AO/DI)
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Bandwidth on Demand (BOD)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Dial on Demand (DDR)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
HSRP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
IPX and SPX Spoofing
No
No
No
No
Yes
Yes
No
Yes
ISDN Caller ID Callback
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Snapshot Routing
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Stac Compression
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Time-based Access Lists
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
X.25 ID
No
Yes
No
Yes
Yes
Yes
Yes
Yes
1 Advanced Telephone Features are available on the Cisco 803 and 804 routers only. These features require supplementary services from a telephone company.
2 Prefix Dialing is supported on Cisco 803 and Cisco 804 routers only.
Table 7 Feature List by Feature Set for the Cisco 805 Router
PAT (NAT Overload)
Yes
Yes
Yes
No
Yes
No
No
No
NAT
Yes
Yes
Yes
No
Yes
No
No
No
NAT with H.323
No
No
No
No
No
No
No
No
GRE Tunneling
No
Yes
No
No
Yes
No
No
No
NAT
Yes
Yes
Yes
No
Yes
No
No
No
PAP, CHAP, MSCHAP, Local Password
Yes
Yes
Yes
No
Yes
No
No
No
Cisco ConfigMaker
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Cisco FastStep
Yes
Yes
Yes
No
Yes1
No
No
No
Easy IP Phase I and II (IPCP Address Negotiation and DHCP Server)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
TFTP Client and Server
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
IP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
IPX
No
No
No
No
Yes
No
No
No
NetBIOS Access Lists
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Transparent Bridging
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Cisco View
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Service Assurance Agent
No
Yes
No
Yes
Yes
Yes
Yes
Yes
SNMP, Telnet, Console Port
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
SNTP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Syslog
No
Yes
No
Yes
Yes
Yes
Yes
Yes
BGP
No
No
No
No
No
No
No
No
EGP
No
No
No
No
No
No
No
No
IGRP
No
No
No
No
No
No
No
No
IP Enhanced IGRP (IP-EIGRP)
No
Yes
No
Yes
Yes
Yes
Yes
Yes
IPX Enhanced IGRP (IPX-EIGRP)
No
No
No
No
No
No
No
No
IP Multicast (relay only)
No
Yes
No
Yes
Yes
Yes
Yes
Yes
IP-Policy Routing
No
Yes
No
Yes
Yes
Yes
Yes
Yes
IPXWAN
No
No
No
No
Yes
Yes
No
Yes
OSPF
No
No
No
No
No
No
No
No
PIM for IP
(5)YB
No
Yes
No
Yes
Yes
Yes
Yes
Yes
RIP, RIPv2, Triggered RIP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
XOT
(3)XG
No
Yes
No
Yes
Yes
Yes
Yes
Yes
AAA Radius
No
No
No
No
No
No
No
No
AAA TACACS+
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Additional Vendor-Proprietary RADIUS Attributes
No
No
No
No
No
No
No
No
Authenticating ACL
No
No
No
No
No
No
No
No
Automated Double Authentication (server functionality)
No
No
No
No
No
No
No
No
Certificate Authority Interoperability
No
No
No
Yes
No
Yes
Yes
Yes
Internet Key Exchange Security Protocol
No
No
No
Yes
No
Yes
Yes
Yes
IPSec Network Security
No
No
No
Yes
No
Yes
Yes
Yes
Cisco IOS Firewall Phase I
–
No
No
Yes
Yes
No
Yes
Yes
Yes
–
No
No
Yes
Yes
No
Yes
Yes
Yes
–
No
No
Yes
Yes
No
Yes
Yes
Yes
–
No
No
Yes
Yes
No
Yes
Yes
Yes
IPSec Encryption with 56 bit DES
No
No
No
Yes
No
Yes
No
No
IPSec Encryption with 168 bit DES (3DES)
No
No
No
No
No
No
Yes
Yes
Lock and Key
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
LT2P
No
No
No
Yes
No
Yes
Yes
Yes
Named Method Lists for AAA Authentication & Accounting
No
No
No
No
No
No
No
No
Route and Router Authentication
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Token Card - Double Authentication
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Frame Relay Encapsulation (for ISDN LL)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Frame Relay Inverse ARP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
ML-PPP, PPP Compression
Yes
Yes
Yes
No
Yes
No
No
No
PPP over Frame Relay (RFC 1973)
No
No
No
No
No
No
No
No
Bandwidth on Demand (BOD)
No
No
No
No
No
No
No
No
Dial on Demand (DDR)
No
No
No
No
No
No
No
No
HSRP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
IPX and SPX Spoofing
No
No
No
No
Yes
Yes
No
Yes
Snapshot Routing
No
No
No
No
No
No
No
No
Stac Compression
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Time-based Access Lists
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
X.25 ID
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1 The X.25 configuration feature requires the use of the Cisco command line interface (CLI).
New and Changed Information
The following sections list the new hardware and software features supported by the Cisco 800 series for Release 12.1(5)YB5 and above:
New Software Features in Release 12.1(5)YB
The following sections list the new software features supported by the Cisco 800 Series Routers for Release 12.1(5)YB.
PIM for IP
This feature implements protocol independent multicast (PIM) routing for IP on the 805 routers. It is implemented in sparse mode, where a router assumes that other routers do not want to forward multicast packets for a group unless there is an explicit request for the traffic.
Cisco 820 QOS Features
The Cisco 820 series routers now support the following QOS features.
•
•
•
ATM TX Ring Programming
Each PVC has a hardware transmit queue, or TX ring. It is a simple FIFO queue, and on the c820 it has a default size of 16 packets. This feature allows adjustment of the size of the TX ring. If both voice and data packets are transmitted on the same PVC, the length of the TX ring must be reduced to a value of about 3 packets. This reduces delay and jitter for voice packets by decreasing the maximum number of data packets or fragments that can be in front of a voice packet inside the TX ring.
Configure the length of the PVC TX ring by following these steps.
Step 1
Step 2
Step 3
LFI
The link fragmentation and interleaving (LFI) feature reduces delay and jitter of voice packets. When there is a mix of traffic, such as large datagrams and small delay-sensitive packets (such as IP voice packets), LFI fragments the large datagrams to packets small enough to satisfy the delay requirements of the delay-sensitive traffic. The delay-sensitive packets are interleaved between the fragments of the large datagrams. Note that the data fragment size must be greater than the voice packet size, otherwise the voice packets be come fragmented and voice quality worsen.
Configure the router for LFI by following these steps.
Step 1
Step 2
a.
b.
c.
d.
e.
f.
fragment size = (bandwidth in Kbps/8) * fragment-delay in milliseconds (ms)
In this case, the fragment size = (640/8) * 10, or 800. The fragment size is greater than the maximum voice packet size of 200, which is that of G.711 20 ms. Note that a low fragment delay corresponds to a fragment size which may be smaller than the voice packet size, resulting in reduced voice quality.
LLQ
Low latency queueing (LLQ) provides a low-latency strict priority transmit queue for real-time traffic, such as VoIP traffic. Strict priority queueing allows delay-sensitive data such as voice to be dequeued and sent first (before packets in other queues are dequeued), giving delay-sensitive data preferential treatment over other traffic. This reduces jitter in voice conversations.
Configure LLQ by following these steps.
Step 1
a.
b.
Step 2
a.
b.
c.
Step 3
a.
b.
c.
Step 4
a.
b.
Configuration Example
The following example combines LFI, LLQ and the PVC TX ring configurations.
class-map match-all voicematch access-group 101!!policy-map mypolicyclass voicepriority 200class class-defaultfair-queue!!interface Ethernet0ip address 70.0.0.1 255.255.255.0no ip mroute-cache!interface ATM0no ip addressbundle-enabledsl operating-mode auto!interface ATM0.1 point-to-pointno ip mroute-cachepvc 1/40encapsulation aal5mux ppp dialerdialer pool-member 1!!interface Dialer1bandwidth 640ip address 60.0.0.1 255.255.255.0encapsulation pppdialer pool 1service-policy output mypolicyppp multilinkppp multilink fragment-delay 10ppp multilink interleave!ip classlessno ip http server!access-list 101 permit ip any any precedence 5!voice-port 1!voice-port 2!voice-port 3!voice-port 4!dial-peer voice 110 potsdestination-pattern 1105555port 1!dial-peer voice 210 voipdestination-pattern 2105555session target ipv4:60.0.0.2codec g711ulawip precedence 5PPPoE MTU Adjustment
If an 826 or 827 router terminates the PPPoE traffic, a computer connected to the Ethernet interface may have problems accessing Web sites because the default Maximum Transmission Unit (MTU) configured on the PCs may be too high. The default MTU is 1460. The solution is to let the router automatically reduce the value of the Maximum Segment Size (MSS) inside the TCP SYN packets transmitted by the PCs by entering the following command on the router's Ethernet interface:
ip adjust-mss mss
where mss must be 1452 or less to fix the PPPoE MTU problem.
This command works only if NAT is configured.
Configuration Example
The following example shows a configuration of a PPPoE client.
vpdn enableno vpdn logging!vpdn-group 1request-dialinprotocol pppoe!interface Ethernet0ip address 192.168.100.1 255.255.255.0ip adjust-mss 1452ip nat insideinterface ATM0no ip addressno atm ilmi-keepalivepvc 8/35pppoe client dial-pool-number 1!dsl operating-mode autohold-queue 224 in!interface Dialer1ip address negotiatedip mtu 1492ip nat outsideencapsulation pppdialer pool 1dialer-group 1ppp authentication pap callinppp pap sent-username sohodyn password 7 141B1309000528!ip nat inside source list 101 interface Dialer1 overloadip route 0.0.0.0.0.0.0.0 Dialer1access-list 101 permit ip 192.168.100.0.0.0.0.255 anyNew Software Features in Release 12.1(1)
For information regarding the features supported in Cisco IOS Release 12.1, refer to the Cross-Platform Release Notes and New Feature Documentation links at the following location on Cisco.com:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/index.htm
This URL is subject to change without notice. If it changes, point your web browser to Cisco.com, and click on the following path:
Service & Support: Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Cisco IOS Release 12.1
Limitations and Restrictions
Cisco 800 Series Router Supported MIBs
Table 9 lists the MIBs supported by the Cisco 800 series routers. Each group of MIBs corresponds to a specific group of images.
Cisco 820 Series Router Supported MIBs
The following MIBs are supported by the Cisco 820 series routers, including the Cisco 827 and Cisco 827-4V routers:
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Important Notes
The following sections contain important notes about Cisco IOS Release 12.1(5)YB5 and above that can apply to the Cisco 800 Series Routers. (Also, see the "Caveats" section.)
B Channel Activation
When a call comes in, a B channel is activated. If the amount of traffic on the B channel exceeds a threshold, the other B channel is activated. If the amount of traffic falls below the threshold, one of the B channels is deactivated. The B channel that is initially activated when the call comes in is not necessarily B1 nor is the B channel that is deactivated when the traffic level lessens necessarily B2.
Cisco 800 Series Memory Management When Using WFQ
When weighted fair queuing (WFQ) is used on the Dialer interface, or when WFQ is used in the default class of a service policy, the following parameters need to be set to the values shown because of the limited amount of memory on the router:
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For example, if you apply WFQ to the Dialer interface, you need to configure it as follows:
interface Dialer 1fair-queue 64 64 0hold-queue 64 outIn this example, the command fair-queue 64 64 0 limits the number of conversations to 64, and sets the discard threshold to 64. The command hold-queue 64 out limits the maximum number of output packets to 64.
In another example, if you configure a service policy, and WFQ is used on the default class, you need to configure the policy as follows:
policy-map mypolicyclass voicepriority 100class class-defaultfair-queue 64queue-limit 64int dialer 1service-policy out mypolicyhold-queue 64 outHere, the command fair-queue 64 limits the number of conversations to 64, and the command queue-limit 64 sets the discard threshold to 64. The command hold-queue 64 out limits the maximum number of output packets to 64.
Failure to configure the above parameters may cause the router to display out-of-memory messages when a large amount of mixed traffic is transmitted from ethernet to ATM.
Cisco 800 Series Router Clock—CSCdp09409
To run IPSec successfully, the Cisco 800 series router clock needs to be set accurately. Cisco 800 series router clocks are set and maintained using Simple Network Time Protocol (SNTP). For best results, set up a Network Time Protocol (NTP) server to periodically send time information messages to Cisco 800 series routers. See the SNTP configuration and command reference documentation for configuration instructions. If you do not have an NTP server, you must reset the Cisco 800 series router clock using the clock set command each time you restart the router.
The SNTP configuration documentation is available in the chapter "Monitoring the Router and Network" volume of the Configuration Fundamentals Configuration Guide in the Cisco IOS documentation set. The SNTP command reference documentation is available in the chapter "Router and Network Monitoring Commands" in the "System Management Commands" volume of the Configuration Fundamentals Command Reference manual of the Cisco IOS documentation set.
Cisco 800 Series Router Enhancements
Cisco 800 series routers support the following features. For more information about these features, see the Cisco IOS documentation set.
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CiscoView Application Support
The CiscoView application supports the Cisco 800 series routers. The CiscoView application provides dynamic status, statistics, and comprehensive configuration information for Cisco switches, routers, concentrators, and adapters. It displays a graphical view of Cisco devices. This network management tool also provides configuring and monitoring functions and offers basic troubleshooting tips.
Dial Peer Limitation
The isdn answer1 and isdn answer2 commands determine which called telephone numbers, for example, 555-1111 and 555-2222, a Cisco 800 series router can answer. Using these commands limits a router to using the two dial peers that contain the telephone numbers 555-1111 and 555-2222. (When not using these commands, a router can use up to six dial peers.) A sample scenario in which the isdn answer1 and isdn answer2 commands are used is when a Cisco 801 or Cisco 803 router is connected with other ISDN devices to an ISDN S-bus.
Downloading Images
Before attempting to download new images, you must first delete files in the router Flash memory. Be sure to use the delete command, not command erase, to free up space. Entering erase removes all files, including the configuration.
Excessive ISDN Line Activation
The following protocols send updates that can cause an ISDN line to be activated excessively, thereby increasing your monthly ISDN line cost:
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See the Cisco 800 Series Routers Software Configuration Guide to set up extended access lists to prevent IP, UDP, IPX, and SNTP updates from activating the ISDN line. For CDP, make certain that you enter the no cdp enable command to disable CDP.
Hanging During Boot
If an illegal console configuration is issued to the router, the console fails the POST tests during boot and causes the router to halt. The only way to recover from this state is to pull apart the soldered boot Flash and re-burn the Boot ROM. This problem has been resolved in TinyROM version 1.0(3), a downloadable ROM upgrade available from Cisco.com. Contact Cisco to upgrade to this version or later, and to prevent this problem from occurring.
ISDN NI1 Provisioning
If you have any problems with your ISDN NI1 provisioning, visit the Cisco ISDN Web site at http://www.cisco.com/isdn.
Multilink PPP and Interleaving
Multilink PPP fragments large data packets so that small voice packets can be interleaved within them. However, apart from first-in-first-out (FIFO) queuing, no other kind of output queuing mechanisms are currently supported with PPP over ATM. Consequently, when multilink PPP is configured on the Cisco 827 routers, the big packets are fragmented, but interleaving of small voice packets within them does not occur.
NAT Support for H.323 Signaling
Currently, NAT does not support alerting H.225 messages. Therefore, NAT communication cannot be established between the router end points. NAT support for H.323 signaling is limited to the Netmeeting application.
Phone Mate Answering Machine Model 9200
A Phone Mate answering machine model 9200 fails to recognize the ringing signal sent by AMD R79 ringing SLIC. This was confirmed by testing against Phone Mate model 3750 and newer model 9300.
PPP over Frame Relay Support (RFC-1973)
Cisco 800 series routers do not support PPP protocol over Frame Relay.
TACACS+ with AAA
Cisco 800 series routers support the Terminal Access Controller Access Control System Plus (TACACS+) protocol through Telnet. TACACS+ is a Cisco proprietary authentication protocol that provides remote access authentication and related network security services, such as event logging. User passwords are administered in a central database, rather than in individual routers. TACACS+ also supports separate modular authentication, authorization, and accounting (AAA) facilities that are configured at individual routers.
For information on how to configure TACACS+, refer to the "Configuring TACACS+" chapter in the Security Configuration Guide. For information on TACACS+ commands, refer to the "TACACS, Extended TACACS, and TACACS+ Commands" chapter in the Security Command Reference.
Cisco 800 series routers do not support the following protocols:
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ROM Monitor set stop-bits Parameter
This release supports the setting of 1 only, for the ROM monitor set stop-bits parameter.
Caveats
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. All caveats in Cisco IOS Release 12.1 and Cisco IOS Release 12.1 T are also in Cisco IOS Release 12.1(5)YB5.
For information on caveats in Cisco IOS Release 12.1, see Caveats for Cisco IOS Release 12.1. For information on caveats in Cisco IOS Release 12.1 T, see Caveats for Cisco IOS Release 12.1 T, which lists severity 1 and 2 caveats and is located on CCO and the Documentation CD-ROM.
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Resolved Caveats - Release 12.1(5)YB5
This section describes unexpected behavior that is fixed in Release 12.1(5)YB5.
Management
CSCdw65903
An error can occur with management protocol processing. Please use the following URL for further information:
http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdw65903
Resolved Caveats - Release 12.1(5)YB4
This section describes possibly unexpected behavior by software Release 12.1(5)YB4.
CSCdt36204
Telnet not working through the tunnel using the VPN Module on 1700.
CSCdt03449
ISDN BRI callout results in VOICE ERROR when ALERTING is received.
CSCdt41384
Router Crash at CCBNET3_add_bchan.
CSCdu12757
1750 crashes after configuring service-policy under ATM interface.
CSCds92106
Router hangs after repeatedly power cycling.
CSCdu37345
AAA commands are not active for 811/813.
CSCdt57231
SSH SSH_MSG_IGNORE messages for terminal echo tests.
CSCdt93866
Unchecked limits in NTP.
CSCdt93862
Access level issue while using Web interface.
CSCdt46181
Redzone corruption in pptp_tcp_readf().
CSCdu04329
if_dslsar_rcv.c:possible deferencing NULL pointer.
CSCdt92629
Incorrect tx buffers calculation in if_dslsar_tx.c.
CSCdt78390
ADSL Phy retrains on an LOM defect condition.
CSCdt41633
Autoinstall not working.
CSCds59167
Transmit error seen while doing a sh run/version or write mem
CSCds90931
With 2 UBR and 1 VBR PVCs, reset ATM int, UBR PVC unable to transmit.
CSCdu38421
The 827 router unexpectedly reloads when unconfiguring the ATM/Dialer interface.
CSCdt67817
Not passing data well after change to higher profile from DSLAM side.
CSCdt11503
IOS crashes when large OID ( >256 fields ) is received.
CSCds56041
Chassis cardTable not populating.
CSCdt85979
PQUICC-1-TOOBIG:PQUICC(0/1), packet too big with WIC-1ASDL.
CSCds85371
Adding new crypto map instance causes all clear traffic to stop.
CSCds37028
Low performance-on GRE+IPSec /w HW enc card compared to IPSec direct.
CSCdu43931
sv3y image does not boot with 32 MB DRAM and default 25% iomem config.
CSCdt96253
CRC-32 compensation vulnerability.
CSCds69577
Connectivity to some WEB sites is lost when router terminates PPPoE.
CSCdt96253
CRC-32 compensation vulnerability.
CSCdt11503
IOS crashes when large OID ( >256 fields ) is received.
CSCdt03962
ATM interface takes long time to get up.
CSCds69577
Connectivity to some WEB sites is lost when router terminates PPPoE.
CSCdt73791
No IPSEC traffic if PAT/NAT public addr are included in crypto ACLs.
Caveats for Release 12.1(5)YB3
This section describes possibly unexpected behavior by software releases prior to Release 12.1(5)YB3 that have been resolved in Release 12.1(5)YB3 and above as well as possibly unexpected behavior that might occur in Release 12.1(5)YB3.
Resolved Caveats for Release 12.1(5)YB3
This section describes possibly unexpected behavior by software releases prior to Release 12.1(5)YB3 that have been resolved in Release 12.1(5)YB3 and above.
CSCds92106
A Cisco 827-4V router might halt after repeated power cycling due to the TI DSP booting up incorrectly under some conditions. This problem is fixed in Cisco IOS Software Release 12.1(5)YB3.
CSCdt77246
When a router is configured for PPPoE and IP NAT, and an incoming packet does not contain an MSS field or its TCP option field is not terminated by 0, the router might stop routing packets.
CSCdu19022
A router might unexpectedly reset if you remove the IP address from an interface while the interface is still attached to the encryption map. This problem is fixed in Cisco IOS Software Release 12.1(5)YB3.
Unresolved Caveats for Release 12.1(5)YB3
This section describes possibly unexpected behavior by Release 12.1(5)YB3.
CSCdu21252
If you shut down an ATM interface in a Cisco 827 router that is configured with VPDN enabled for the PPPoE client, the router might unexpectedly reset.
Resolved Caveats for Release 12.1(5)YB1
This section describes possibly unexpected behavior by software releases prior to Release 12.1(5)YB1 that have been resolved in Release 12.1(5)YB1 and above.
CSCdt19816
A router retrains when an LOM is detected—a critical condition message is sent out, resulting in an unnecessary reboot. A LOM alone is not sufficient to require a critical condition message or router reset. This problem is fixed in Cisco IOS Software Release 12.1(5)YB1.
CSCdt54144
A Cisco 827-4V router might unexpectedly reset when sending or receiving a fax via a Cisco 2620 router with an ISDN BRI voice card. This problem is fixed in Cisco IOS Software Release 12.1(5)YB1.
Related Documentation
The following sections describe the documentation available for the Cisco 800 Series Routers. Typically, these documents consist of hardware and software installation guides, Cisco IOS configuration and command references, system error messages, feature modules, and other documents.
Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online on Cisco.com and the Documentation CD-ROM.
Use these release notes with the documents listed in the following sections:
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Release-Specific Documents
The following documents are specific to Release 12.1. They are located on Cisco.com and the Documentation CD-ROM:
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Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Release Notes: Cross-Platform Release Notes
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Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Release Notes: Cross-Platform Release Notes
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To reach these documents from Cisco.com, click on this path (under the heading Service & Support):
Technical Documents: Product Bulletins
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The Caveats for Cisco IOS Release 12.1 and Caveats for Cisco IOS Release 12.1 T documents contain caveats applicable to all platforms for all maintenance releases of Release 12.1.
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Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Caveats
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Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Caveats
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Platform-Specific Documents
These documents are available for the Cisco 800 Series Routers on Cisco.com and the Documentation CD-ROM:
Cisco 801-804 Routers
These documents are available for the Cisco 800 series on Cisco.com and the Documentation CD-ROM:
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On Cisco.com at:
Technical Documents: Documentation Home Page: Access Servers and Access Routers: Fixed Access Routers: Cisco 801-804 Routers
On the Documentation CD-ROM at:
Cisco Product Documentation: Access Servers and Access Routers: Fixed Access Routers: Cisco 801-804 Routers
Cisco 805 Routers
These documents are available for the Cisco 805 router on Cisco.com and the Documentation CD-ROM.
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On Cisco.com at:
Service & Support: Documentation Home Page: Access Servers and Access Routers: Fixed Access Routers: Cisco 805 Router
On the Documentation CD-ROM at:
Cisco Product Documentation: Access Servers and Access Routers: Fixed Access Routers: Cisco 805 Router
Cisco 827 Routers
These documents are available for the Cisco 820 series routers on Cisco.com and the Documentation CD-ROM:
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On Cisco.com at:
Technical Documents: Documentation Home Page: Access Servers and Access Routers: Fixed Configuration Access Routers: Cisco 827 Routers
On the Documentation CD-ROM at:
Cisco Product Documentation: Access Servers and Access Routers: Fixed Configuration Access Routers: Cisco 827 Routers
Feature Modules
Feature modules describe new features supported by Release 12.1 and are updates to the Cisco IOS documentation set. A feature module consists of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the feature modules are available online only. Feature module information is incorporated in the next printing of the Cisco IOS documentation set.
To reach the Release 12.1 feature modules:
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Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation: New Features in 12.1-Based Limited Lifetime Releases: New Features in 12.1X Releases: New Features in 12.1(3)X Releases
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Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation: New Features in 12.1-Based Limited Lifetime Releases: New Features in 12.1X Releases: New Features in 12.1(3)X Releases
Feature Navigator
Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a particular set of features and which features are supported in a particular Cisco IOS image. Feature Navigator is available 24 hours a day, 7 days a week.
To access Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, e-mail the Contact Database Administration group at cdbadmin@cisco.com. If you do not have an account on Cisco.com, go to http://www.cisco.com/register and follow the directions to set up an account.
To use Feature Navigator, you must have a JavaScript-enabled web browser such as Netscape 3.0 or later, or Internet Explorer 4.0 or later. Internet Explorer 4.0 always has JavaScript enabled. To enable JavaScript for Netscape 3.x or Netscape 4.x, follow the instructions provided with the web browser. For JavaScript support and enabling instructions for other browsers, check with the browser vendor.
Feature Navigator is updated when major Cisco IOS software releases and technology releases occur. You can access Feature Navigator at the following URL:
http://www.cisco.com/go/fn
Cisco IOS Software Documentation Set
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents that are shipped with your order in electronic form on the Documentation CD-ROM—unless you specifically ordered printed versions.
Documentation Modules
Each module in the Cisco IOS documentation set consists of two types of books: a configuration guide and a corresponding command reference. Chapters in a configuration guide describe protocols, configuration tasks, Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference. The Cisco IOS software documentation set is available on Cisco.com and on the Documentation CD-ROM.
On Cisco.com at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References
Release 12.1 Documentation Set
Table 10 describes the contents of the Cisco IOS Release 12.1 software documentation set, which is available in both electronic and printed form.
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On Cisco.com at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1
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Obtaining Documentation
The following sections provide sources for obtaining documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at the following sites:
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Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
Ordering Documentation
Cisco documentation is available in the following ways:
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http://www.cisco.com/cgi-bin/order/order_root.pl
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http://www.cisco.com/go/subscription
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Documentation Feedback
If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments to the following address:
Cisco Systems, Inc.
Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC website.
Cisco.com
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.
Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
Customers and partners can self-register on Cisco.com to obtain additional personalized information and services. Registered users can order products, check on the status of an order, access technical support, and view benefits specific to their relationships with Cisco.
To access Cisco.com, go to the following website:
http://www.cisco.com
Technical Assistance Center
The Cisco TAC website is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.
Contacting TAC by Using the Cisco TAC Website
If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC website:
http://www.cisco.com/tac
P3 and P4 level problems are defined as follows:
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In each of the above cases, use the Cisco TAC website to quickly find answers to your questions.
To register for Cisco.com, go to the following website:
http://www.cisco.com/register/
If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following website:
http://www.cisco.com/tac/caseopen
Contacting TAC by Telephone
If you have a priority level 1(P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following website:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
P1 and P2 level problems are defined as follows:
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