yestoday,i setup a lab environment:using 8510,2924xl,3548xl and a pc as
sniffer.
2924xl(0/24)----hub------(0/0/1)8510(0/0/0)--------3548xl
|
|
pc(sniffer)
the first , i am using isl encapsulation in 2924 and 3548,vtp
domain:test,
3548 is vtp server and 2924 is vtp client,disable the cdp
**********************************************
2924
interface FastEthernet0/24
description link to 8510
switchport trunk encapsulation dot1q
switchport mode trunk
no cdp enable
3548
interface FastEthernet0/48
switchport trunk encapsulation dot1q
switchport mode trunk
no cdp run
in 8510,i just set up a simple bridge,nothing else:
interface FastEthernet0/0/0
no ip address
no ip directed-broadcast
bridge-group 1
!
interface FastEthernet0/0/1
no ip address
no ip directed-broadcast
bridge-group 1
bridge 1 protocol ieee
then a add a vlan in the 3548,ok,in 2924,i find the vlan i created in
3548,the vtp is span to the 2924
the second ,I change 2924 and 3548's trunk encapsulation to dot1q,and
change both native to vlan 2
the result is same.
at last ,for 8510 does not support support bridging between supinterface
encap dot1q,i change the encap to isl ,and
i roll the sequence of bridging.
interface FastEthernet0/0/0.1
encapsulation isl 1
no ip redirects
no ip directed-broadcast
bridge-group 1
!
interface FastEthernet0/0/0.2
encapsulation isl 2
no ip redirects
no ip directed-broadcast
bridge-group 2
nterface FastEthernet0/0/1.1
encapsulation isl 1
no ip redirects
no ip directed-broadcast
bridge-group 2
!
interface FastEthernet0/0/1.2
encapsulation isl 2
no ip redirects
no ip directed-broadcast
bridge-group 1
out of my thought,the vtp can still span from the 3548 to 2924,
i check the packet captured by the sniffer,and find the reason,
the vtp is always send out from the vlan 1,is independ from the native
vlan,
and in the third lab,the 2924 received the vtp messages from vlan 2,it
also
can identify the vtp info.
i don't know how to output the sniffer captured packet to txt
format,anyone who interest about
it can send you the packet ,or someone who knows the way can tell me
howto output txt format.
thanks for everyone here
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