Que ocurre si un trunk con switch en modo transparente se convierte en modo servidor

Posted on Actualizado enn

Hola a todos.

He participado en una página de CISCO en un foro acerca VTP y plantean este escenario que os traigo:

transparent_switch

 

 

 

(Hacer clic para agrandar imagen)

El switch en modo transparente esta en medio de las conexiones del trunk, es la única unión entreel switch servidor y el switch cliente.

El switch servidor crea 3 vlans, vlan 10,11 y 12 y el switch transparente tiene la vlan 222.

¿Tu crees que las VLAN creadas en el switch server irán hacia el switch cliente?¿porque?

¿Si el switch en modo transparente se transforma en servidor, ¿que crees que ocurrirá? ¿se sumaran lass VLANs? ¿Se borraran?

Esto ha sido discutido en esta página , partiendo de una pregunta anterior, pero os muestro aquí los resultados.

Conclusión primera pregunta:
3 switches unidos en un tronco en el mismo dominio comparten su VLAN entre servidor y cliente. El switch Transparent no consigue que los cambios los rechacen.

¿Por qué ocurre? Switch de modo transparente: Los switches transparentes -VTP no participan en VTP. Un switch transparente VTP no anuncia su configuración de VLAN y no sincroniza su configuración de VLAN basada en anuncios recibidos, pero los switches transparentes envían anuncios VTP que reciben sus puertos troncal en VTP Versión 2.

Fuente: http: //www.cisco.com/c/en/us/support/docs/lan-switching/vtp/10558-21.html

Conclusión segunda pregunta: Sorpresa para mí. switch transparente quita todo lo que tiene antes y obtiene la información desde el switch servidor . Ahora tenemos 3 switches unidos en un tronco compartiendo la misma información  

Otra sorpresa: He cambiado de nuevo el switch del medio (switch servidor por un momento) para cambiar de nuevo a switch transparente. He recargado. Espero que este cambio de obtener información de vlan.dat información con la vieja información (VLAN 22). Sólo para tratar de recordar la vieja configuración. Imagina que pierdes la configuración de un switch !. Quería crear el primer escenario El resultado es que el switch ha perdido todo lo que tenía como switch transparente. Una vez más, el switch transparente no cambia nada cuando he creado un nuevo vlan en el switch servidor, pero la VLAN 22 está perdida para siempre.


********* INIT OF VALUES PART "BEFORE CONNECT THE LINKS" *********

==================server switch==================

server#sh vtp status

VTP Version                    : 2

Configuration Revision          : 3

Maximum VLANs supported locally : 255

Number of existing VLANs        : 8

VTP Operating Mode              : Server

VTP Domain Name                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0x73 0x40 0x9A 0x93 0x05 0x59 0x4E 0xB1

Configuration last modified by 0.0.0.0 at 3-1-93 00:03:54

Local updater ID is 0.0.0.0 (no valid interface found)

server#sh vl

server#sh vlan brief







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, 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

11  VLAN0011                        active

12  VLAN0012                        active

1002 fddi-default                    active

1003 token-ring-default              active

1004 fddinet-default                  active

1005 trnet-default                    active













================== transparent switch==================







transparent#sh 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                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0xAA 0xB9 0x0C 0xCD 0xD7 0xE8 0xA6 0xE0

Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

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

20  VLAN0020                        active

1002 fddi-default                    active

1003 token-ring-default              active

1004 fddinet-default                  active

1005 trnet-default                    active













================== client switch==================







client#sh vtp status

VTP Version                    : 2

Configuration Revision          : 0

Maximum VLANs supported locally : 255

Number of existing VLANs        : 6

VTP Operating Mode              : Client

VTP Domain Name                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0xAA 0xB9 0x0C 0xCD 0xD7 0xE8 0xA6 0xE0

Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

client#sh vla

client#sh vlan bri

client#sh vlan brief







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, 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

client#




********* END OF VALUES PART "BEFORE CONNECT THE LINKS" *********




********* INIT OF VALUES PART "AFTER CONNECT THE LINKS" *********

==================server switch==================

server#sh vtp status

VTP Version                    : 2

Configuration Revision          : 3

Maximum VLANs supported locally : 255

Number of existing VLANs        : 8

VTP Operating Mode              : Server

VTP Domain Name                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0x73 0x40 0x9A 0x93 0x05 0x59 0x4E 0xB1

Configuration last modified by 0.0.0.0 at 3-1-93 00:03:54

Local updater ID is 0.0.0.0 (no valid interface found)

server#sh vlan br

server#sh vlan brief







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, Fa0/12, 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

11  VLAN0011                        active

12  VLAN0012                        active

1002 fddi-default                    active

1003 token-ring-default              active

1004 fddinet-default                  active

1005 trnet-default                    active

server#







================== transparent switch==================







transparent#sh vtp status

VTP Version                    : 2

Configuration Revision          : 0

Maximum VLANs supported locally : 255

Number of existing VLANs        : 6

VTP Operating Mode              : Transparent

VTP Domain Name                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0xAA 0xB9 0x0C 0xCD 0xD7 0xE8 0xA6 0xE0

Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

transparent#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

20  VLAN0020                        active

1002 fddi-default                    active

1003 token-ring-default              active

1004 fddinet-default                  active

1005 trnet-default                    active

transparent#







================== client switch==================

client#sh vtp status

VTP Version                    : 2

Configuration Revision          : 3

Maximum VLANs supported locally : 255

Number of existing VLANs        : 8

VTP Operating Mode              : Client

VTP Domain Name                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0x73 0x40 0x9A 0x93 0x05 0x59 0x4E 0xB1

Configuration last modified by 0.0.0.0 at 3-1-93 00:03:54

client#sh vla

client#sh vlan bri

client#sh vlan brief







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, Fa0/12, 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

11  VLAN0011                        active

12  VLAN0012                        active

1002 fddi-default                    active

1003 token-ring-default              active

1004 fddinet-default                  active

1005 trnet-default                    active

client#







********* END OF VALUES PART "AFTER CONNECT THE LINKS" *********




























********* INIT OF VALUES PART "TRANSPARENT SWITCH COMES SERVER SWITCH" *********

==================server switch==================













server#sh vtp status

VTP Version                    : 2

Configuration Revision          : 3

Maximum VLANs supported locally : 255

Number of existing VLANs        : 8

VTP Operating Mode              : Server

VTP Domain Name                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0x73 0x40 0x9A 0x93 0x05 0x59 0x4E 0xB1

Configuration last modified by 0.0.0.0 at 3-1-93 00:03:54

Local updater ID is 0.0.0.0 (no valid interface found)

server#sh vla

server#sh vlan bri

server#sh vlan brief







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, Fa0/12, 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  

11  VLAN0011                        active  

12  VLAN0012                        active  

1002 fddi-default                    active  

1003 token-ring-default              active  

1004 fddinet-default                  active  

1005 trnet-default                    active  

server#







================== transparent switch that comes to server switch ==================







transparent#sh vtp status

VTP Version                    : 2

Configuration Revision          : 3

Maximum VLANs supported locally : 255

Number of existing VLANs        : 8

VTP Operating Mode              : Server

VTP Domain Name                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0x73 0x40 0x9A 0x93 0x05 0x59 0x4E 0xB1

Configuration last modified by 0.0.0.0 at 3-1-93 00:03:54

Local updater ID is 0.0.0.0 (no valid interface found)

transparent#sh vl

transparent#sh vlan br

transparent#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  

11  VLAN0011                        active  

12  VLAN0012                        active  

1002 fddi-default                    active  

1003 token-ring-default              active  

1004 fddinet-default                  active  

1005 trnet-default                    active  

transparent#



















================== client switch ==================

client#sh vtp status

VTP Version                    : 2

Configuration Revision          : 3

Maximum VLANs supported locally : 255

Number of existing VLANs        : 8

VTP Operating Mode              : Client

VTP Domain Name                : cisco

VTP Pruning Mode                : Disabled

VTP V2 Mode                    : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0x73 0x40 0x9A 0x93 0x05 0x59 0x4E 0xB1

Configuration last modified by 0.0.0.0 at 3-1-93 00:03:54

client#sh vlan brief







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, Fa0/12, 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  

11  VLAN0011                        active  

12  VLAN0012                        active  

1002 fddi-default                    active  

1003 token-ring-default              active  

1004 fddinet-default                  active  

1005 trnet-default                    active  

client#










********* END OF VALUES PART "TRANSPARENT SWITCH COMES SERVER SWITCH" *********

 


En la pagina de CISCO he escrito en inglés y me he traído la información traduciendo con googletranslate. Lo siento por los errores de traducción.

El ejercicio de la página de CISCO parte de una pregunta de examen acerca el tema perro ligeramente diferente. El escennario que muestro es una pregunta que sale tras trabajar el primer escenario.

 

AUTOR: David Perez Martorell

Nota: Si te sirvió lo que postié, te pido 2 segundos para contestar las encuestas que figuran abajo.

Gracias!

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