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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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