Tuesday

VTP


 Before you add any switch to the network you need to get in the habit of checking the VTP configuration and make sure the VTP Configuration Revision number is set to 0. You can do this by console in to the switch and type in sho vtp status, if the revision is not 0 then do write erase and reload. This will put your switch to manufacture default. If you don’t do that and the Configuration Revision on your network switches is lower then your new switches  your  Vlan nodes will be down and you just created a big problem.


SW1#sho vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 255
Number of existing VLANs        : 5
VTP Operating Mode              : Server
VTP Domain Name                 : ciscosteps
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x7D 0x5A 0xA6 0x0E 0x9A 0x72 0xA0 0x3A
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 0.0.0.0 (no valid interface found)

VTP Server:
  • Power to change vlan info
  • sends and receive VTP updates
  • saves Vlan config
======================================================

SW2#sho vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 255
Number of existing VLANs        : 5
VTP Operating Mode              : Client
VTP Domain Name                 : ciscosteps
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x7D 0x5A 0xA6 0x0E 0x9A 0x72 0xA0 0x3A
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

VTP Client:
  • can't change vlan info
  • sends and receive VTP updates
  • does not save Vlan config
=======================================================

SW3#sho vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 255
Number of existing VLANs        : 5
VTP Operating Mode              : Transparent
VTP Domain Name                 : ciscosteps
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x7D 0x5A 0xA6 0x0E 0x9A 0x72 0xA0 0x3A
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

VTP Transparent:

  • Power to change vlan info
  • forwards VTP updates
  • does not listen to VTP updates
  • saves Vlan config
Posted by at No comments:

Monday

configuring L3 etherChannel

Configuring L3 ether-channel is almost the same as L2 the only exception is to add L3 protocol . To configure L3 on L2 switch you need to enable the port be a routed port otherwise you will not be able to add the ip address command to the interface .


Switch(config)#inter port-channel 12
Switch(config-if)#no switchport --> This command changes the interface from L2 to L3
Switch(config-if)#ip address 12.0.0.1 255.255.255.0
Switch(config-if)#no shut
Switch(config-if)#end
Switch#

Switch#ping 12.0.0.2--> the other ether-channel on SW2

Sending 5, 100-byte ICMP Echos to 12.0.0.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/5 ms


--------------------------------------------------------------------------


Switch#sho etherchannel
                Channel-group listing:
                ----------------------

Group: 12
----------
Group state = L2
Ports: 2 Maxports = 16
Port-channels: 1 Max Port-channels = 16
Protocol:   LACP
Switch#sho etherchannel summ
Switch#sho etherchannel summary
Flags:  D - down        P - in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port


Number of channel-groups in use: 1
Number of aggregators:           1

Group  Port-channel  Protocol    Ports
------+-------------+-----------+----------------------------------------------

12     Po12(SU)           LACP   Fa0/1(P) Fa0/2(P)

--------------------------------------------------------------------------

Switch#sho interfaces etherchannel
FastEthernet0/1:
Port state    = 1
Channel group = 12          Mode = Active          Gcchange = -
Port-channel  = Po12        GC   =   -             Pseudo port-channel = Po12
Port index    = 0           Load = 0x00            Protocol =   LACP

Flags:  S - Device is sending Slow LACPDUs   F - Device is sending fast LACPDUs

        A - Device is in active mode.        P - Device is in passive mode.

Local information:
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Fa0/1     SA      down      32768         0x0       0x0     0x1         

Partner's information:
                  LACP port                        Admin  Oper   Port    Port
Port      Flags   Priority  Dev ID          Age    key    Key    Number  State
Fa0/1     SA      32768     00E0.B080.DED2         0x0    0x0    0x1     

Age of the port in the current state:  00d:02h:10m:50s

FastEthernet0/2:
Port state    = 1
Channel group = 12          Mode = Active          Gcchange = -
Port-channel  = Po12        GC   =   -             Pseudo port-channel = Po12
Port index    = 0           Load = 0x00            Protocol =   LACP

Flags:  S - Device is sending Slow LACPDUs   F - Device is sending fast LACPDUs

        A - Device is in active mode.        P - Device is in passive mode.

Local information:
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Fa0/2     SA      down      32768         0x0       0x0     0x2         

Partner's information:
                  LACP port                        Admin  Oper   Port    Port
Port      Flags   Priority  Dev ID          Age    key    Key    Number  State
Fa0/2     SA      32768     00E0.B080.DED2         0x0    0x0    0x2     

Age of the port in the current state:  00d:02h:10m:50s

----
Port-channel12:Port-channel12   (Primary aggregator)
Age of the Port-channel   = 00d:00h:30m:58s
Logical slot/port   = 2/12             Number of ports = 2
HotStandBy port = null
Port state          =
Protocol            =   1
Port Security       = Disabled

Ports in the Port-channel:

Index   Load   Port     EC state        No of bits
------+------+------+------------------+-----------
  0     00     Fa0/1    Active             0
  0     00     Fa0/2    Active             0
Time since last port bundled:    00d:02h:10m:50s    Fa0/2




Posted by at No comments:

configuring L2 etherChannel

As you will see here, to utilize all the bandwidth, we created L2 ether-channel by combining both links and the commands to do that are the following:


Switch#config t
Switch(config)#int range fa0/1 - 2
Switch(config-if-range)#channel-protocol ?

  lacp  Prepare interface for LACP protocol
  pagp  Prepare interface for PAgP protocol

Switch(config-if-range)#channel-protocol lacp
Switch(config-if-range)#channel-group 12 ?

  mode  Etherchannel Mode of the interface

Switch(config-if-range)#channel-group 12 mode ?

  active        Enable LACP unconditionally
  auto          Enable PAgP only if a PAgP device is detected
  desirable  Enable PAgP unconditionally
  on            Enable Etherchannel only
  passive    Enable LACP only if a LACP device is detected

Switch(config-if-range)#channel-group 12 mode active ?
  <cr>
Switch(config-if-range)#channel-group 12 mode active

%LINK-5-CHANGED: Interface Port-channel 12, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 12, changed state to up
Switch(config-if-range)#end

------------------------------------------------------------------------------------

Switch#sho ip int b | inc up

Interface              IP-Address      OK? Method Status                Protocol

FastEthernet0/1        unassigned      YES unset  up                    up

FastEthernet0/2        unassigned      YES unset  up                    up
 
Port-channel 12        unassigned      YES unset  up                    up

Switch#

Switch#sho etherchannel
                Channel-group listing:
                ----------------------

Group: 12
----------
Group state = L2
Ports: 2 Maxports = 16
Port-channels: 1 Max Port-channels = 16
Protocol:   LACP


------------------------------------------------------------------------------------

Switch#sho etherchannel port-channel
                Channel-group listing:
                ----------------------

Group: 12
----------
                Port-channels in the group:
                ---------------------------

Port-channel: Po12    (Primary Aggregator)
------------

Age of the Port-channel   = 00d:00h:17m:39s
Logical slot/port   = 2/12      Number of ports = 2
GC                  = 0x00000000      HotStandBy port = null
Port state          = Port-channel
Protocol            =   LACP
Port Security       = Disabled

Ports in the Port-channel:

Index   Load   Port     EC state        No of bits
------+------+------+------------------+-----------
  0     00     Fa0/1    Active             0
  0     00     Fa0/2    Active             0
Time since last port bundled:    00d:00h:15m:41s    Fa0/2
Switch#
Posted by at No comments:

Spanning Tree

This is the spanning tree at its best , it is enable by default , once the spanning tree detect a loop on the topology it will block one of the port to prevent a loop. we can do show spanning-tree command to check.

Switch#sho spanning-tree
VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32769
             Address     00D0.5825.5C01
             Cost        19
             Port        1(FastEthernet0/1)
             Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     00E0.B080.DED2
             Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  20

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/2            Altn BLK 19        128.2    P2p
Fa0/1            Root FWD 19        128.1    P2p





Posted by at No comments:

Basic Vlan config


Switch>en
Switch#config t
Switch(config)#int fa0/12
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 12
% Access VLAN does not exist. Creating vlan 12
Switch(config-if)#int fa0/13
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 13
% Access VLAN does not exist. Creating vlan 13


------------------------------------------------------------------

Switch>en
Switch#config t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#int fa0/1
Switch(config-if)#switchport mode trunk
Switch(config-if)#end
Switch#
Switch#sho interfaces trunk
Port        Mode         Encapsulation  Status        Native vlan
Fa0/1       on           802.1q         trunking      1

Port        Vlans allowed on trunk
Fa0/1       1-1005

Port        Vlans allowed and active in management domain
Fa0/1       1,12,13

Port        Vlans in spanning tree forwarding state and not pruned
Fa0/1       1,12,13

-------------------------------------------------------------------

Switch#sho vlan

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/2, Fa0/3, Fa0/4, Fa0/5
                                                Fa0/6, Fa0/7, Fa0/8, Fa0/9
                                                Fa0/10, Fa0/11, Fa0/14, Fa0/15
                                                Fa0/16, Fa0/17, Fa0/18, Fa0/19
                                                Fa0/20, Fa0/21, Fa0/22, Fa0/23
                                                Fa0/24, Gig1/1, Gig1/2
12   VLAN0012                         active    Fa0/12
13   VLAN0013                         active    Fa0/13
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup
Posted by at No comments:
Subscribe to: Posts (Atom)