Table Of Contents
Release Notes for Cisco 827 Routers
This document describes new and changed information for the Cisco 827 Routers Hardware Installation Guide and the Cisco 827 Routers Software Configuration Guide.
For last-minute updates to this release note, refer to the Cisco 827 routers documentation Web site at http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/index.htm.
ADSL Cable Requirements
The ADSL cable that you connect to the Cisco 827 router must be 10BaseT Category 5, unshielded twisted-pair (UTP) cable. Using regular telephone cable can introduce line errors.
DHCP Client Support
Follow these steps to configure the router for DHCP client support:
Step 1 Configure the BVI interface by entering the ip address dhcp client-id Ethernet 0 command.
Specifying the value client-id ethernet0 means that the MAC address of the Ethernet interface is used as the client ID when the DHCP request is sent. Otherwise, the MAC address of the BVI interface is used as the client ID.
Step 2 Configure NAT:
a. Configure the BVI interface by entering the ip nat outside command.
b. Configure the Ethernet interface by entering the ip nat inside command.
c. Create an access list under NAT by entering the access-list 1 permit ip address command to match all Ethernet IP addresses.
d. Configure the source list under NAT by entering the
ip nat inside source list 1 interface BVI 1 overload command.
Step 3 Configure the Cisco 827 router to act as a DHCP server. This step is optional.
a. At the config-if router prompt, enter the ip dhcp pool server name command.
b. Enter the import all command to have the Cisco 827 router retrieve the Microsoft Windows nameserver (WINS) and domain name system (DNS) server addresses for name resolution.
The following example shows a configuration of the DHCP client.Current configuration:!version 12.0no service padservice timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname c827!!ip subnet-zeroip dhcp excluded-address 10.10.10.1!ip dhcp pool SERVERnetwork 10.10.10.0 255.255.255.0default-router 10.10.10.1import all!bridge irbinterface Ethernet0ip address 10.10.10.1 255.255.255.0no ip directed-broadcastip nat inside!interface ATM0no ip addressno ip directed-broadcastno atm ilmi-keepalivebundle-enablehold-queue 208 in!interface ATM0.1 point-to-pointno ip directed-broadcastpvc 1/100encapsulation aal5snap!bridge-group 1!interface ATM0.2 point-to-pointip address 126.96.36.199 255.0.0.0no ip directed-broadcastpvc 1/101protocol ip 188.8.131.52 broadcastprotocol ip 184.108.40.206 broadcastencapsulation aal5snap!!interface BVI1ip address dhcp client-id Ethernet0no ip directed-broadcastip nat outside!ip nat inside source list 1 interface BVI1 overloadip classlessip route 0.0.0.0 0.0.0.0 BVI1no ip http server!access-list 1 permit 10.10.10.0 0.0.0.255bridge 1 protocol ieeebridge 1 route ip!voice-port 1timing hookflash-in 0!voice-port 2timing hookflash-in 0!voice-port 3timing hookflash-in 0!voice-port 4timing hookflash-in 0!!line con 0exec-timeout 0 0transport input nonestopbits 1line vty 0 4password lablogin!scheduler max-task-time 5000end
Dialer Interface Configuration
The "Configuring the Dialer Interface" section in Chapter 3, "Feature-By-Feature Router Configurations," of the Cisco 827 Routers Software Configuration Guide has an incorrect router prompt in Step 4. The prompt should be Router(config-if).
Easy IP (Phase 1) Configuration
The "Configuring Easy IP (Phase 1)" section in Chapter 3, "Feature-By-Feature Router Configurations," of the Cisco 827 Routers Software Configuration Guide has an incorrect reference in Step 2. The task should refer to the access list defined in Step 1 rather than in Step 2.
The Modem Management Interface (MMI) is software that enables auto-provisioning for the Cisco 827 routers. The MMI uses a fixed PVC to communicate with the Proxy Element (PE) residing on the digital subscriber line access multiplexer (DSLAM). Using MMI, the Cisco 827 router updates the running image and downloads the prescribed configuration using a configuration file or configuration values in a provisioning information database.
Configuring MMI for Auto-Provisioning
The customer premise equipment (CPE) can be automatically configured using the Cisco DSL CPE download, but it can be configured only with the image provisioning feature. The following provisioning configuration files are not supported in this release:
•CDCM objects below the CPE level (that is, the ATM VCC objects)
•propVirtual objects and interface objects (ATMif and Ethernetif)
Follow these steps to configure the router for MMI support in configure-terminal mode:
Step 1 To set the configuration approach for MMI, enter the following command:
no mmi auto-configure
If this parameter is enabled, the router is provisioned by the PE. By default, this parameter is enabled.
If this parameter is disabled, the router is configured by the start up configuration file.
Step 2 To set the polling interval for the router to check the PE for any updated image or configuration files, enter the following command:
mmi polling-interval time
where time is the number of seconds. The polling-interval range is from 1 to 65535, with the default set to 60 seconds.
Step 3 To set the ATM PVC so the MMI communicates with the PE, enter the following command:
mmi pvc vpi/vci
where vpi/vci is the virtual path identifier/virtual channel identifier. The default PVC for MMI is 0/16 ilmi, but if it is not available, you must set the specific PVC for the router to communicate with the PE.
Step 4 To set the timer to monitor the image file download, enter the following command in configure terminal mode:
mmi snmp-timeout time
where time is 1 to 1800 seconds, which is the allowed interval to download any two consecutive blocks. If you enter the no mmi snmp-timeout command, the default time is set to 180 seconds.
Step 5 To eliminate the ADSL line training delay, enter the following command:
dsl operating-mode auto
If the DSLAM is using a Cisco 4xDMT ADI-based card, enter the following command:
dsl operating-mode ansi-dmt
Step 6 To set up the debug process for MMI, enter the following command:
Step 7 Save the configuration file to NVRAM and reload. The router's OK LED on the front panel blinks while the image is being auto-provisioned. The PVC is set up when the reboot occurs.
MMI Configuration Example
The following example shows an MMI configuration:820-voice1#sh runBuilding configuration...Current configuration :947 bytes!version 12.1no service single-slot-reload-enableno service padservice timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname 820-voice1!no logging bufferedno logging bufferedlogging rate-limit console 10 except errors!mmi polling-interval 1000no mmi auto-configuremmi pvc 0/16debug mmiip subnet-zerono ip finger!!!interface Ethernet0no ip addressshutdown!interface Virtual-Template1no ip address!interface ATM0no ip addresspvc 0/101!bundle-enabledsl operating-mode auto!ip classlessno ip http server!snmp-server manager!voice-port 1!voice-port 2!voice-port 3!voice-port 4>line con 0transport input nonestopbits 1line vty 0 4login!scheduler max-task-time 5000end
Notes for the DSL Provider
To use the Cisco automated configuration solution with the Cisco 827 CPEs, follow these steps:
Step 1 Enable the MMI configuration, as described in the previous section.
Step 2 Ping from the DSLAM to the CPE to ensure the DSLAM is a proxy element host.
Step 3 Store the MMI configuration file on an FTP server that acts as the proxy element's image server.
Step 4 Use Cisco DSL CPE Manager (CDCM) to add the configuration file to the proxy element's image table. The image file can also be added to the PE.
Step 5 Use CDCM to deploy the CPE. You can manually deploy it or use autodiscovery to deploy multiple CPE's.
Step 6 Use CDCM to provision an image for each CPE, which associates a specific configuration file to the CPE.
For more information on the Cisco DSL CPE image provisioning, refer to the following documents:
•Cisco DSL CPE Automated Configuration Solution Guide
•Cisco DSL CPE Manager
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.
PPP over AAL5SNAP Encapsulation Support
PPP over AAL5SNAP encapsulation is currently not supported, although the context-sensitive help mentions that it can be configured.
PPP over Ethernet Support
This feature supports the PPP over Ethernet (PPPoE) client on an ATM permanent virtual circuit (PVC). Only one PPPoE client on a single ATM PVC is supported. The PPPoE client over an ATM interface is supported for all 820 platforms.
The following figure depicts a typical deployment scenario for PPPoE support:
Figure 1 PPPoE Deployment Scenarios
A PPPoE session is initiated on the client side by the network described above. If the session has a timeout or is disconnected, the PPPoE client immediately attempts to reestablish the session.
Follow these steps to configure the router for PPPoE client support:
Step 1 If your router is running a Cisco IOS release prior to Cisco IOS release 12.2(13)T, configure the virtual private dialup network (VPDN) group number. If your router is running Cisco IOS release 12.2(13)T or higher, proceed to Step 2.
Note Enabling VPDN is not necessary for routers running Cisco IOS release 12.2(13)T or higher.
a. Enter the vpdn enable command in global configuration mode.
b. Configure the VPDN group by entering the vpdn group tag command.
c. Specify the dialing direction by entering the request-dialin command in the VPDN group.
d. Specify the type of protocol in the VPDN group by entering the protocol pppoe command.
Step 2 Configure the ATM interface with PPPoE support.
a. Configure the ATM interface by entering the interface atm 0 command.
b. Specify the ATM PVC by entering the pvc number command.
c. Configure the PPPoE client and specify the dialer interface to use for cloning by entering the pppoe-client dial-pool-number number command.
Step 3 Configure the dialer interface by entering the int dialer number command.
a. Configure the IP address as negotiated by entering the ip address negotiated command.
b. Configure authentication for your network by entering the ppp authentication protocol command. This step is optional.
c. Configure the dialer pool number by entering the dialer pool number command.
d. Configure the dialer-group number by entering the dialer-group number command.
e. Configure a dialer list corresponding to the dialer-group by entering the dialer-list 1 protocol ip permit command.
Note Multiple PPPoE clients can run on a different PVCs, in which case, each client has to use a separate dialer interface and a separate dialer pool, and the PPP parameters need to be applied on the dialer interface.
If you enter the clear vpdn tunnel pppoe command with a PPPoE client session already established, the PPPoE client session terminates and the PPPoE client immediately tries to reestablish the session.
The following example shows a configuration of a PPPoE client on a router running a Cisco IOS release prior to Cisco IOS release 12.2(13)T.vpdn enablevpdn-group 1request-dialinprotocol pppoeint atm0pvc 1/100pppoe-client dial-pool-number 1int dialer 1ip address negotiatedppp authentication chapdialer pool 1dialer-group 1
The following example shows a configuration of a PPPoE client on a router running Cisco IOS release 12.2(13)T or higher.int atm0pvc 1/100pppoe-client dial-pool-number 1int dialer 1ip address negotiatedppp authentication chapdialer pool 1dialer-group 1
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