Tuesday, 28 April 2020

Switching Tshoot - Ticket 1


PC AND LAPTOP BOTH ARE IN THE SAME VLAN 10 (10.1.1.0/24)

WHEREAS SERVER IS IN THE ANOTHER VLAN 20 (10.1.2.0/24)

SW1 is a Layer 3 Switch

SW2 , SW3 AND SW4 are Layer 2 Switches

Issue :-
=================

PC not able to ping laptop and vice versa









SW2#sh int status
Port      Name               Status       Vlan       Duplex  Speed Type
Fa0/1                        connected    1          auto    auto  10/100BaseTX
Fa0/2                        connected    1          auto    auto  10/100BaseTX

From PC

FastEthernet0 Connection:(default port)

   Link-local IPv6 Address.........: FE80::201:64FF:FE0C:9609
   IP Address......................: 10.1.1.2
   Subnet Mask.....................: 255.255.255.0
   Default Gateway.................: 10.1.1.1
 
 
Let try to ping the laptop

C:\>ping 10.1.1.3

Pinging 10.1.1.3 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 10.1.1.3:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

interface FastEthernet0/2
 switchport access vlan 10
 switchport mode access

SW2#sh vlan brief

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/3, Fa0/4, Fa0/5, Fa0/6
                                                Fa0/7, Fa0/8, Fa0/9, Fa0/10
                                                Fa0/11, Fa0/12, Fa0/13, Fa0/14
                                                Fa0/15, Fa0/16, Fa0/17, Fa0/18
                                                Fa0/19, Fa0/20, Fa0/21, Fa0/22
                                                Fa0/23, Fa0/24, Gig0/1, Gig0/2
1002 fddi-default                     active 
1003 token-ring-default               active 
1004 fddinet-default                  active 
1005 trnet-default                    active 
SW2#

NO L2 VLAN 10 IS CREATED

LETS CREATE VLAN 10

SW2#config
Configuring from terminal, memory, or network [terminal]?
Enter configuration commands, one per line.  End with CNTL/Z.
SW2(config)#vlan 10
SW2(config-vlan)#^Z
SW2#
%SYS-5-CONFIG_I: Configured from console by console

SW2#
SW2#sh vlan brief

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/3, Fa0/4, Fa0/5, Fa0/6
                                                Fa0/7, Fa0/8, Fa0/9, Fa0/10
                                                Fa0/11, Fa0/12, Fa0/13, Fa0/14
                                                Fa0/15, Fa0/16, Fa0/17, Fa0/18
                                                Fa0/19, Fa0/20, Fa0/21, Fa0/22
                                                Fa0/23, Fa0/24, Gig0/1, Gig0/2
10   VLAN0010                         active    Fa0/2
1002 fddi-default                     active 
1003 token-ring-default               active 
1004 fddinet-default                  active 
1005 trnet-default                    active 
SW2#


But still not able to ping Laptop

C:\>ping 10.1.1.3

Pinging 10.1.1.3 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 10.1.1.3:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),


Lets check on switch 4

SW4#sh int status
Port      Name               Status       Vlan       Duplex  Speed Type
Fa0/1                        err-disabled 1          auto    auto  10/100BaseTX
Fa0/2                        connected    10         auto    auto  10/100BaseTX

We can see the trunk interface Fa0/1 is in err-disabled

SW4(config)#int fa0/1
SW4(config-if)#sh

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down
SW4(config-if)#no sh

SW4(config-if)#
%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
%SPANTREE-2-BLOCK_BPDUGUARD: Received BPDU on port FastEthernet0/1 with BPDU Guard enabled. Disabling port.

%PM-4-ERR_DISABLE: bpduguard error detected on 0/1, putting 0/1 in err-disable state


%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down

On interface Fa0/1 which is a trunk port BPDU guard is enable which makes it disabled

SW4#sh spanning-tree interface fa0/1
no spanning tree info available for FastEthernet0/1

interface FastEthernet0/1
 switchport mode trunk
 spanning-tree bpduguard enable

SW4(config)#int fa0/1
SW4(config-if)#spanning-tree bpduguard ?
  disable  Disable BPDU guard for this interface
  enable   Enable BPDU guard for this interface
SW4(config-if)#spanning-tree bpduguard disable
SW4(config-if)#^Z
SW4#

SW4(config)#int fa0/1
SW4(config-if)#shut

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down
SW4(config-if)#no shut

SW4(config-if)#
%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up

SW4(config-if)#^Z
SW4#
%SYS-5-CONFIG_I: Configured from console by console

SW4#sh spanning-tree interface fa0/1
Vlan             Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
VLAN0001         Altn LSN 19        128.1     P2p
VLAN0010         Altn LSN 19        128.1     P2p

NOW LETS PING PC TO Laptop
C:\>ping 10.1.1.3

Pinging 10.1.1.3 with 32 bytes of data:

Reply from 10.1.1.3: bytes=32 time=11ms TTL=128
Reply from 10.1.1.3: bytes=32 time<1ms TTL=128
Reply from 10.1.1.3: bytes=32 time=1ms TTL=128
Reply from 10.1.1.3: bytes=32 time<1ms TTL=128

Ping statistics for 10.1.1.3:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 11ms, Average = 3ms


Thanks For Reading !!!!

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