Cisco Router 826 Routers Software Configuration Guide
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3-3 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 3 Basic Router Configuration Configuring Basic Parameters Configuring Global Parameters Use the following table to configure the router for global parameters. For complete information on the global parameter commands, see the Cisco IOS Release 12.2 documentation set. Configuring the Ethernet Interface To configure the Ethernet interface, use the following table, beginning in global configuration mode. For complete information on the Ethernet commands, see the Cisco IOS Release 12.2 documentation set. For more general information on Ethernet concepts, see Chapter 1, “Concepts.” NoteThe SOHO 97 Router Ethernet interface remains in an up state when the connected switchport is down and when no cable is connect to the Ethernet interface. In addition, the switchport that is connected to the SOHO 97 Ethernet port stays up when the SOHO 97 Ethernet port is down. Configuration Example The following example shows the Ethernet interface configuration. You do not need to enter the commands marked “default.” These commands appear automatically in the configuration file generated when you use the show running-config command. Command Purpose Step 1configure terminalEnters configuration mode. Step 2hostname nameSpecifies the name for the router. Step 3enable secret passwordSpecifies an encrypted password to prevent unauthorized access to the router. Step 4ip subnet-zeroConfigures the router to recognize zero subnet range as valid range of addresses. Step 5no ip domain-lookupDisables the router from translating unfamiliar words (typos) entered during a console session into IP addresses. Command Purpose Step 1interface ethernet 0Enters configuration mode for the Ethernet interface. Step 2ip address ip-address maskSets the IP address and subnet mask for the Ethernet interface. Step 3no shutdownEnables the Ethernet interface to change the state from administratively down to up. Step 4exitExits configuration mode for the Ethernet interface.
3-4 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 3 Basic Router Configuration Configuring Basic Parameters ! interface Ethernet0 ip address 192.168.1.1 255.255.255.0 no ip directed-broadcast (default) ! Verifying Your Configuration To verify that you have properly configured the Ethernet interface, enter the show interface ethernet0 command. You should see a verification output like the example shown below. router#show interface eth0 Ethernet0 is up, line protocol is up Hardware is PQUICC Ethernet, address is 0000.Oc13.a4db (bia0010.9181.1281) Internet address is 170.1.4.101/24 MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255., txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Configuring the Dialer Interface Use these commands if you are using PPP encapsulation for the ATM PVC. Use the following table to configure the dialer interface, beginning in global configuration mode. Command Purpose Step 1interface dialer number Enters configuration mode for the dialer interface. Step 2encapsulation pppSpecifies the encapsulation type for the PVC as PPP. Step 3ip address ip-address maskSets the IP address and subnet mask for the dialer interface. Step 4dialer pool numberSpecifies which dialer pool number you are using. Step 5pvc vpi/vciCreates an ATM PVC for each end node with which the router communicates. Step 6encapsulation aal5mux ppp dialerSpecifies the encapsulation type as AAL5MUX PPP. Step 7dialer pool-member numberSpecifies a dialer pool-member. Step 8dialer-group numberSpecifies a dialer group. The dialer group is required to fast-switch outgoing packets. Step 9exitExits configuration mode for the ATM interface.
3-5 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 3 Basic Router Configuration Configuring Basic Parameters Configuration Example The following example shows the dialer interface configuration. You do not need to input the commands marked “default.” These commands appear automatically in the configuration file generated when you use the show running-config command. ! interface atm0 pvc 1/40 encapsulation aal5mux ppp dialer dialer pool-member 1 ! interface dialer 0 ip address 200.200.100.1 255.255.255.0 encapsulation ppp dialer pool 1 ! Verifying Your Configuration To verify that you have properly configured the dialer interface, enter the show interface virtual-access 1 command. Both line protocol and dialer 0 should be up and running. You should see a verification output like the example shown below. router(config-if)#show interface virtual-access 1 Virtual-Access1 is up, line protocol is up Hardware is Virtual Access interface Interface is unnumbered. Using address of Dialer0 (2.2.2.1) MTU 1500 bytes, BW 100000 Kbit, DLY 100000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, loopback not set Virtual-access 1 is up means that the interface is up and running. If you see the output Virtual-access 1 is down, it means that the interface is “administratively down,” and the interface is configured with the shutdown command. To bring the interface up, you must enter the no shutdown command. Configuring the Loopback Interface This section describes configuring the loopback interface. The loopback interface acts as a placeholder for the static IP address and provides default routing information. For complete information on the loopback commands, see the Cisco IOS Release 12.2 documentation set. Configuration Tasks Use the following table to configure the loopback interface. Command Purpose Step 1interface Loopback 0Enters configuration mode for the loopback interface. Step 2ip address ip-address maskSets the IP address and subnet mask for the loopback interface.
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Configuring Basic Parameters
Sample Configuration
The loopback interface in this sample configuration is used to support NAT on the virtual-template
interface. This sample configuration shows the loopback interface configured on the Ethernet interface
with an IP address of 200.200.100.1/24, which acts as a static IP address. The loopback interface points
back to virtual-template1, which has a negotiated IP address.
!
interface Loopback0
ip address 200.200.100.1 255.255.255.0 (static IP address)
ip nat outside
!
interface Virtual-Template1
ip unnumbered loopback0
no ip directed-broadcast
ip nat outside
!
Verifying Your Configuration
To verify that you have properly configured the loopback interface, enter the show interface loopback
0 command. You should see a verification output similar to the following example.
Router #show interface loopback 0
Loopback0 is up, line protocol is up
Hardware is Loopback
Internet address is 200.200.100.1/24
MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation LOOPBACK, loopback not set
Last input never, output never, output hang never
Last clearing of show interface counters never
Queueing strategy: fifo
Output queue 0/0, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Another way to verify the loopback interface is to send multiple ping packets to it:
Router#ping 200.200.100.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.200.100.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
Step 3ip nat outsideSets the interface to be connected to the outside
network.
Step 4exitExits configuration mode for the loopback
interface. Command Purpose
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Configuring Basic Parameters
Configuring the Asynchronous Transfer Mode Interface
To configure the Asynchronous Transfer Mode (ATM) interface, use the following table, beginning in
global configuration mode.
NoteThe default service class for configuring the ATM interface is unspecified bit rate (ubr). You can change
the service class to variable bit rate non-real time (vbr-nrt) or variable bit rate real time (vbr-rt) by using
one of these commands: vbr-nrt or vbr-rt. See the Cisco IOS Release 12.2 documentation set. For more
information on definitions of service classes, see Chapter 1, “Concepts.”
For complete information on the ATM commands, see the Cisco IOS Release 12.2 documentation set.
For more general information on ATM concepts, see Chapter 1, “Concepts.”
AAL5SNAP Encapsulation Configuration Example
The following example shows the ATM interface configuration for AAL5SNAP encapsulation.
You do not need to enter the commands marked “default.” These commands appear automatically in the
configuration file generated when you use the show running-config command.
!
interface ATM0
ip address 200.200.100.1 255.255.255.0
Command Purpose
Step 1interface ATM 0Enters configuration mode for the ATM interface.
Step 2dsl equipment-type {co | cpe} Configures the DSL equipment type, if
applicable.
Step 3dsl linerate {number | auto} Specifies the G.SHDSL line rate, if applicable.
The range of valid numbers is between 72 and
2312.
Step 4dsl operating-mode gshdsl symmetric annex
annexSets the G.SHDSL operating mode, if applicable,
and select the G.991.2 annex.
Step 5ip address ip-address maskSets the IP address and subnet mask for the ATM
interface.
Step 6pvc vpi/vciCreates an ATM PVC for each end node with
which the router communicates.
Step 7protocol ip ip-address broadcastSets the protocol broadcast for the IP address.
Step 8encapsulation protocolSpecifies the encapsulation type for the PVC.
Encapsulations can be specified as AAL5SNAP,
AAL5MUX IP, or AAL5MUX PPP.
1
1. This step is optional. If you specify the AAL5MUX PPP encapsulation, you will need to add an additional step to specify the
dialer pool-member number using the command dialer-pool member number.
Step 9tx-ring-limit numberConfigures the size of the PVC transmit queue.
The default setting is 6.
Step 10no shutdownEnables the ATM interface.
Step 11exitExits configuration mode for the ATM interface.
3-8 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 3 Basic Router Configuration Configuring Basic Parameters no ip directed-broadcast (default) no atm ilmi-keepalive (default) pvc 8/35 encapsulation aal5snap protocol ip 200.200.100.254 broadcast ! Verifying Your Configuration To verify that you have properly configured the ATM interface with AAL5SNAP encapsulation, enter the show interface atm0 command. You should see a verification output like the example shown below. router#sh int atm0 ATM0 is up, line protocol is up Hardware is PQUICC_SAR (with Alcatel ADSL Module) Internet address is 1.1.1.1/24 MTU 1500 bytes, sub MTU 1500, BW 640 Kbit, DLY 80 usec, reliability 113/255. txload 1/255, rxload 1/255 Encapsulation aal5snap, loopback not set Keepalive not supported DTR is pulsed for 5 seconds on reset LCP Closed AAL5MUX PPP Encapsulation Configuration Example The following example shows an ATM interface configuration for an AAL5MUX PPP encapsulation. You do not need to enter the commands marked “default.” These commands appear automatically in the configuration file generated when you use the show running-config command. ! interface ATM0 no ip directed-broadcast (default) no atm ilmi-keepalive (default) pvc 8/35 encapsulation aal5mux ppp dialer dialer pool-member 1 ! Verifying Your Configuration To verify that you have properly configured the ATM interface with AAL5MUX PPP encapsulation, enter the virtual-access 1 command. You should see a verification output like the example shown below. router#sh int virtual-access 1 Virtual-Access1 is up, line protocol is up Hardware is Virtual Access interface Interface is unnumbered. Using address of Dialer0 (2.2.2.1) MTU 1500 bytes, BW 100000 Kbit, DLY 100000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, loopback not set Virtual-access 1 is up means that the interface is up and running. If you see the output Virtual-access 1 is down, it means that the interface is “administratively down,” and the interface is configured with the shutdown command. To bring the interface up, you must enter the no shutdown command.
3-9 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 3 Basic Router Configuration Configuring Bridging Configuring Command-Line Access to the Router To configure parameters to control access to the router, use the following table, beginning in global configuration mode. For complete information on the command line commands, see the Cisco IOS Release 12.2 documentation set. Configuration Example The following configuration shows the command-line access commands. You do not need to input the commands marked “default.” These commands appear automatically in the configuration file generated when you use the show running-config command. ! line con 0 exec-timeout 10 0 password 4youreyesonly login transport input none (default) stopbits 1 (default) line vty 0 4 password secret login ! Configuring Bridging Bridges are store-and-forward devices that use unique hardware addresses to filter traffic that would otherwise travel from one segment to another. You can configure the routers as pure bridges.Command Purpose Step 1line console 0Enters line configuration mode, and specify the console terminal line. Step 2password passwordSpecifies a unique password on the line. Step 3loginEnables password checking at terminal session login. Step 4exec-timeout 10 0Sets the interval that EXEC command interpreter waits until user input is detected. Exec-timeout 10 0 is the default. Step 5line vty 0 4Specifies a virtual terminal for remote console access. Step 6password passwordSpecifies a unique password on the line. Step 7loginEnables password checking at virtual terminal session login. Step 8endExits line configuration mode, and return to privileged EXEC mode.
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Configuring Bridging
To configure bridging, use the following table, beginning in global configuration mode.
For complete information on the bridging commands, see the Cisco IOS Release 12.2 documentation set.
For more general concepts on bridging, see Chapter 1, “Concepts.”
Configuration Example
The following configuration example uses bridging with AAL5SNAP encapsulation. You do not need to
enter the commands marked “default.” These commands appear automatically in the configuration file
generated when you use the show running-config command.
This configuration example shows the Ethernet and ATM interfaces configured. The Ethernet interface
has IP addressing turned off for bridging, and IP directed broadcast is disabled, which prevents the
translation of directed broadcasts to physical broadcasts. The bridge-group number to which the ATM
interface is associated is set to 1. Command Purpose
Step 1no ip routingDisables IP routing.
Step 2bridge number protocol protocolSpecifies the bridge protocol to define the type of
Spanning-Tree Protocol (STP).
Step 3interface ethernet 0Enters configuration mode for the Ethernet
interface.
Step 4bridge-group numberSpecifies the bridge-group number to which the
Ethernet interface belongs.
Step 5no shutdownEnables the Ethernet interface.
Step 6exitExits configuration mode for the Ethernet
interface and the router.
Step 7interface ATM 0Enters configuration mode for the ATM interface.
Step 8dsl equipment-type {co | cpe} Configures the DSL equipment type, if
applicable.
Step 9dsl linerate {number | auto} Specifies the G.SHDSL line rate, if applicable.
The range of valid numbers is between 72 and
2312.
Step 10dsl operating-mode gshdsl symmetric annex
annexSets the G.SHDSL operating mode, if applicable,
and select the G.991.2 annex.
Step 11pvc vpi/vciCreates an ATM PVC for each end node with
which the router communicates.
Step 12encapsulation typeSpecifies the encapsulation type for the PVC.
Step 13bridge-group numberSpecifies the bridge-group number to which the
ATM interface belongs.
Step 14no shutdownEnables the ATM interface.
Step 15end Exits the configuration mode for the ATM
interface.
3-11 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 3 Basic Router Configuration Configuring Bridging The ATM interface has a PVC of 8/35, and the encapsulation is set to AAL5SNAP. The IP address is disabled for bridging and the IP directed broadcast is disabled, which prevents the translation of directed broadcasts to physical broadcasts. The bridge protocol is set to 1 to define the STP. no ip routing ! interface Ethernet0 no ip address no ip directed-broadcast (default) bridge-group 1 ! interface ATM0 no ip address no ip directed-broadcast (default) pvc 8/35 encapsulation aal5snap ! bridge-group 1 ! ip classless (default) ! bridge 1 protocol ieee ! end Verifying Your Configuration To verify that you have properly configured bridging, enter the show spanning-tree command. You should see a verification output like the example shown below. router#show spanning-tree Bridge group 1 is executing the IEEE compatible Spanning Tree protocol Bridge Identifier has priority 32768, address 1205.9356.0000 Configured hello time 2, max age 20, forward delay 15 We are the root of the spanning tree Port Number size is 9 Topology change flag set, detected flag set Times: hold 1, topology change 35, notification 2 hello 2, max age 20, forward delay 15 Timers:hello 1, topology change 34, notification 0 bridge aging time 15 Port 2 (Ethernet0) of Bridge group 1 is forwarding Port path cost 100, Port priority 128 Designated root has priority 32768, address 1205.9356.0000 Designated bridge has priority 32768, address 1205.9356.0000 Designated port is 2, path cost 0 Timers:message age 0, forward delay 0, hold 0 BPDU:sent 0, received 0 Port 3 (ATM0 RFC 1483) of Bridge group 1 is forwarding Port path cost 1562, Port priority 128 Designated root has priority 32768, address 1205.9356.0000 Designated bridge has priority 32768, address 1205.9356.0000 Designated port is 3, path cost 0 Timers:message age 0, forward delay 0, hold 0 BPDU:sent 0, received 0
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Configuring Static Routing
Configuring Static Routing
Static routes are routing information that you manually configure into the router. If the network topology
changes, the static route must be updated with a new route. Static routes are private routes, unless they
are redistributed by a routing protocol. Configuring static routing on the 800-series routers is optional.
To configure static routing, use the following table, beginning in global configuration mode.
For complete information on the static routing commands, see the Cisco IOS Release 12.2
documentation set. For more general information on static routing, see Chapter 1, “Concepts.”
Configuration Example
In the following configuration example, the static route is sending all IP packets with a destination of
1.0.0.0 and a subnet mask of 255.0.0.0 out on the ATM interface to another device with an IP address of
14.0.0.1. Specifically, the packets are being sent to the configured PVC.
You do not need to enter the commands marked “default.” These commands appear automatically in the
configuration file generated when you use the show running-config command.
!
ip classless (default)
ip route 1.0.0.0 255.0.0.0 atm0 14.0.0.1
no ip http server (default)
!
Verifying Your Configuration
To verify that you have properly configured static routing, enter the show ip route command and look
for static routes signified by the “S.”
You should see a verification output like the example shown below.
router#show ip route
Codes:C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS
inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
5* 2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Ethernet0/0
S* 0.0.0.0/0 is directly connected, Ethernet0/0
Command Purpose
Step 1ip classlessSets up a best route for packets destined for
networks unknown by the router.
Step 2ip route network-number mask Specifies the static route for the IP packets.
Step 3endExits router configuration mode.