Intervlan Communication - Answer part 2

Create SVI interfaces and enable routing on the L3 switch 3550 - SW_C
Check if the Vlans 10 and 20 show up in SW_C
(Vlan10 and 20 should show up because all switches belong to the same VTP domain.

SW3550_C>en
Password:
SW3550_C#sh vlan brief

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/6, Fa0/7, Fa0/11, Fa0/12
Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/19, Fa0/20, Fa0/21
Fa0/23, Fa0/24, Gi0/1, Gi0/2
10 ACCOUNTING active
20 SALES active Fa0/5
1002 fddi-default act/unsup
1003 trcrf-default act/unsup
1004 fddinet-default act/unsup
1005 trbrf-default act/unsup

Enabling routing in L3 switch.

SW3550_C#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW3550_C(config)#ip routing


Creating SVI interfaces.

SW3550_C(config)#int vlan 10
SW3550_C(config-if)#ip add
*Mar 6 01:58:43.513: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to up10.10.10.254 255.255.255.0
SW3550_C(config-if)#no shut
SW3550_C(config-if)#exit
SW3550_C(config)#int vlan 20
SW3550_C(config-if)#ip add 20.20.20.254 255.255.255.0
SW3550_C(config-if)#no shut
SW3550_C(config-if)#^Z

Now let verify.


SW3550_C#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Vlan1 192.168.1.201 YES NVRAM up up
Vlan10 10.10.10.254 YES manual up up
Vlan20 20.20.20.254 YES manual up up
FastEthernet0/1 unassigned YES unset down down
FastEthernet0/2 unassigned YES unset down down
FastEthernet0/3 unassigned YES unset up up
FastEthernet0/4 unassigned YES unset up up
FastEthernet0/5 unassigned YES unset down down
FastEthernet0/6 unassigned YES unset down down
FastEthernet0/7 unassigned YES unset down down
FastEthernet0/8 unassigned YES unset down down
FastEthernet0/9 unassigned YES unset up up
FastEthernet0/10 unassigned YES unset up up
FastEthernet0/11 unassigned YES unset down down
FastEthernet0/12 unassigned YES unset down down
FastEthernet0/13 unassigned YES unset down down
FastEthernet0/14 unassigned YES unset down down
FastEthernet0/15 unassigned YES unset down down
FastEthernet0/16 unassigned YES unset down down
FastEthernet0/17 unassigned YES unset down down
FastEthernet0/18 unassigned YES unset down down
FastEthernet0/19 unassigned YES unset down down
--More--
SW3550_C#sh int vlan 10
Vlan10 is up, line protocol is up
Hardware is EtherSVI, address is 000e.831d.ce80 (bia 000e.831d.ce80)
Internet address is 10.10.10.254/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:01:59, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
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 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
1 packets output, 60 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
SW3550_C#sh int vlan 10 20
Vlan20 is up, line protocol is up
Hardware is EtherSVI, address is 000e.831d.ce80 (bia 000e.831d.ce80)
Internet address is 20.20.20.254/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:06:10, output 00:01:46, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 47
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
27 packets input, 2538 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
8324 packets output, 748820 bytes, 0 underruns
2 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out


Now let verify if HOSTS in vlan 10 are able to ping HOSTS in vlan 20.

HostA_R3_2801#ping 20.20.20.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.20.20.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
HostA_R3_2801#ping 20.20.20.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.20.20.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)


Nothing is working - what is the problem?

The default gateway must be setup on all hosts.
Remember my hosts are routers that I am simulated as PC-

The default gateway for each vlan is the int vlan configured in L3 switch.

HostA_R3_2801#conf t
Enter configuration commands, one per line. End with CNTL/Z.
HostA_R3_2801(config)#ip route 0.0.0.0 0.0.0.0 10.10.10.254
HostA_R3_2801(config)#^Z
HostA_R3_2801#
access_server#2
[Resuming connection 2 to r4 ... ]

HostB_r4_3640#cof t nf t
Enter configuration commands, one per line. End with CNTL/Z.
HostB_r4_3640(config)#ip route 0.0.0.0 0.0.0.0 20.20.20.254
HostB_r4_3640(config)#^Z
HostB_r4_3640#wr
Building configuration...

access_server#3
[Resuming connection 3 to r5 ... ]
[OK]
HostC_R5_3640#
HostC_R5_3640#conf t
Enter configuration commands, one per line. End with CNTL/Z.
HostC_R5_3640(config)#ip route 0.0.0.0 0.0.0.0 10.10.10.254
HostC_R5_3640(config)#^Z
HostC_R5_3640#wr
Building configuration...

access_server#4
[Resuming connection 4 to r6 ... ]

*Mar 21 06:
HostD_R6_3640#conf t
Enter configuration commands, one per line. End with CNTL/Z.
HostD_R6_3640(config)#ip route 0.0.0.0 0.0.0.0 20.20.20.254
HostD_R6_3640(config)#^Z
HostD_R6_3640#wr
Building configuration...


Now is the moment of truth-
Intervlan communication
let ping hosts in different vlan


HostA_R3_2801#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 60 percent (3/5), round-trip min/avg/max = 1/2/4 ms
HostA_R3_2801#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
HostA_R3_2801#
access_server#
[Resuming connection 1 to r3cme ... ]

HostA_R3_2801#ping 20.20.20.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.20.20.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/2/4 ms
HostA_R3_2801#ping 20.20.20.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.20.20.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
HostA_R3_2801#
access_server#4
[Resuming connection 4 to r6 ... ]

HostD_R6_3640#ping 20.20.20.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.20.20.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
HostD_R6_3640#ping 20.20.20.1 10.10.10.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
HostD_R6_3640#ping 10.10.10.1 2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/3/4 ms
HostD_R6_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 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
HostD_R6_3640#