Intervlan Communication - Answer part 1

Create Vlans and assigning interfaces to Vlan

SW2950_A#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW2950_A(config)#vlan 10
SW2950_A(config-vlan)#name ACCOUNTING
SW2950_A(config-vlan)#exit
SW2950_A(config)#vlan 20
SW2950_A(config-vlan)#name SALES
SW2950_A(config-vlan)#exit
SW2950_A(config)#int fa0/13
SW2950_A(config-if)#desc HOST A
SW2950_A(config-if)#sw mode acc
SW2950_A(config-if)#sw acc vlan 10
SW2950_A(config-if)#int fa0/14
SW2950_A(config-if)#desc HOST B
SW2950_A(config-if)#sw mode acc
SW2950_A(config-if)#sw acc vlan 20
SW2950_A(config-if)#^Z

Because of all of the switches are in the same VTP domain,
vlans created in SW_A will show up in SW_B and SW_C

SW12_B>en
Password:
SW12_B#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW12_B(config)#exit
SW12_B#sh vlan brief
5d01h: %SYS-5-CONFIG_I: Configured from console by console

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9, Gi0/1, Gi0/2
10 ACCOUNTING active
20 SALES active
1002 fddi-default act/unsup
1003 trcrf-default act/unsup
1004 fddinet-default act/unsup
1005 trbrf-default act/unsup

SW12_B#sh vtp status
VTP Version : 2
Configuration Revision : 31
Maximum VLANs supported locally : 250
Number of existing VLANs : 7
VTP Operating Mode : Server
VTP Domain Name : CCNP
VTP Pruning Mode : Enabled
VTP V2 Mode : Enabled
VTP Traps Generation : Disabled
MD5 digest : 0xAB 0x67 0x8C 0xDD 0x95 0x8D 0x0F 0xEA
Configuration last modified by 192.168.1.202 at 3-6-93 01:48:40
Local updater ID is 192.168.1.203 on interface Vl1 (lowest numbered VLAN interface found)


I am going to put HOST C and D in vlan 10 and 20 respectively.

SW12_B(config)#
5d01h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up
SW12_B(config)#int fa0/3
SW12_B(config-if)#desc HOST C
SW12_B(config-if)#sw mode acc
SW12_B(config-if)#sw acc vlan 10
SW12_B(config-if)#int fa0/4
SW12_B(config-if)#desc HOST D
SW12_B(config-if)#sw mode acc
SW12_B(config-if)#sw acc vlan 20


Now I am going to test pinging all HOSTS

From HOST A, I am going to ping HOST C
(HOST A and C are in the same vlan 10 - I should be able to ping it)
HostA_R3_2801#ping 10.10.10.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms


From HOST B, I am going to ping HOST D
HOST B and D are in the same vlan 20 - I should be able to ping it)


HostB_r4_3640#ping 20.20.20.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.20.20.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

HOSTS IN VLAN 10 ARE NOT ABLE TO PING HOSTS IN VLAN 20

HostB_r4_3640#ping 10.10.10.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)