Practical Exercise 8-2 Solution
Examples 8-44 and 8-45 show the bridging configurations of both DSL CPE devices.
Example 8-44 Configuration Output for lab-827A
lab-827A#show running-config Building configuration... Current configuration : 763 bytes ! version 12.2 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname lab-827A ! ip subnet-zero no ip routing ! interface Ethernet0 ip address 10.2.2.2 255.255.255.0 no ip route-cache bridge-group 1 hold-queue 100 out ! interface ATM0 mac-address 0001.96a4.84ac ip address 10.2.2.2 255.255.255.0 no ip route-cache no atm ilmi-keepalive pvc 0/35 encapsulation aal5snap ! dsl operating-mode auto dsl power-cutback 0 bridge-group 1 ! ip classless ip http server ! bridge 1 protocol ieee call rsvp-sync ! line con 0 stopbits 1 line vty 0 4 ! scheduler max-task-time 5000 end
Example 8-45 Configuration Output for lab-827B
lab-827B#show running-config Building configuration... Current configuration : 670 bytes ! version 12.2 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname lab-827B ! no logging console ! ip subnet-zero no ip routing ! interface Ethernet0 ip address 10.2.2.3 255.255.255.0 no ip route-cache bridge-group 1 hold-queue 100 out ! interface ATM0 mac-address 0001.96a4.8fae ip address 10.2.2.3 255.255.255.0 no ip route-cache no atm ilmi-keepalive pvc 0/35 encapsulation aal5snap ! dsl operating-mode auto bridge-group 1 ! ip classless ip http server ip pim bidir-enable ! bridge 1 protocol ieee ! line con 0 stopbits 1 line vty 0 4 ! scheduler max-task-time 5000 end
Example 8-46 shows the bridging configuration of the Cisco 6400.
Example 8-46 Configuration Output for lab-6400NRP
lab-6400NRP#show running-config Building configuration... Current configuration : 907 bytes ! version 12.2 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname lab-6400NRP ! logging rate-limit console 10 except errors no logging console ! redundancy main-cpu auto-sync standard no secondary console enable ip subnet-zero ! bridge irb ! interface ATM0/0/0 no ip address no atm ilmi-keepalive hold-queue 500 in ! interface ATM0/0/0.135 point-to-point pvc 1/35 encapsulation aal5snap ! bridge-group 1 ! interface ATM0/0/0.235 point-to-point pvc 2/35 encapsulation aal5snap ! bridge-group 1 ! interface Ethernet0/0/1 ip address negotiated ! interface Ethernet0/0/0 no ip address shutdown ! interface FastEthernet0/0/0 no ip address half-duplex ! interface BVI1 ip address 10.2.2.1 255.255.255.0 ! ip classless ip http server ! ! ! ! bridge 1 protocol ieee bridge 1 route ip ! line con 0 line aux 0 line vty 0 4 ! end
Example 8-47 shows that Bridge group 1 is running the IEEE Spanning Tree Protocol.
Example 8-47 Displaying the Spanning Tree Protocol (IEEE)
lab-6400NRP#show spanning-tree 1
Bridge group 1 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, address 0000.0c7f.70fc
Configured hello time 2, max age 20, forward delay 15
We are the root of the spanning tree
Topology change flag not set, detected flag not set
Number of topology changes 4 last change occurred 00:35:16 ago
from ATM0/0/0.235
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0, aging 300
Port 6 (ATM0/0/0.135) of Bridge group 1 is forwarding
Port path cost 14, Port priority 128, Port Identifier 128.6.
Designated root has priority 32768, address 0000.0c7f.70fc
Designated bridge has priority 32768, address 0000.0c7f.70fc
Designated port id is 128.6, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 1663, received 2
Port 8 (ATM0/0/0.235) of Bridge group 1 is forwarding
Port path cost 14, Port priority 128, Port Identifier 128.8.
Designated root has priority 32768, address 0000.0c7f.70fc
Designated bridge has priority 32768, address 0000.0c7f.70fc
Designated port id is 128.8, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 1527, received 1
Example 8-48 shows the IP and MAC addresses of lab-827A and lab-827B. show arp is a useful command to verify whether bridging is configured properly.
Example 8-48 Displaying ARP Information
lab-6400NRP#show arp Protocol Address Age (min) Hardware Addr Type Interface Internet 10.2.2.2 31 0001.96a4.84ac ARPA BVI1 Internet 10.2.2.3 31 0001.96a4.8fae ARPA BVI1 Internet 10.2.2.1 - 0050.7359.35a6 ARPA BVI1
Example 8-49 illustrates that both subinterfaces are in the same bridge group (Bridge group 1), and traffic is passed among them. show bridge is another useful command to debug RFC 1483 bridging.
Example 8-49 Displaying Classes of Entries in the Bridge Forwarding Database
lab-6400NRP#show bridge verbose Total of 300 station blocks, 298 free Codes: P - permanent, S - self BG Hash Address Action Interface VC Age RX count TX count 1 21/0 0001.96a4.8fae forward ATM0/0/0.235 2 0 5 5 1 28/0 0001.96a4.84ac forward ATM0/0/0.135 1 0 100 100 Flood ports (BG 1) RX count TX count ATM0/0/0.135 0 0 ATM0/0/0.235 0 0
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