Re: bgp neighbor and ISL trunk

Here is the show int trunk

SW1#sh int trunk

Port Mode Encapsulation Status Native vlan
Et2/2 on isl trunking 1

Port Vlans allowed on trunk
Et2/2 10

Port Vlans allowed and active in management domain
Et2/2 10

Port Vlans in spanning tree forwarding state and not pruned
Et2/2 10

SW2#sh int trunk

Port Mode Encapsulation Status Native vlan
Et2/2 on isl trunking 1

Port Vlans allowed on trunk
Et2/2 10

Port Vlans allowed and active in management domain
Et2/2 10

Port Vlans in spanning tree forwarding state and not pruned
Et2/2 10

SW1#sh run int e2/2
Building configuration...

Current configuration : 206 bytes
!
interface Ethernet2/2
 switchport
 switchport trunk encapsulation isl ------> If i change the encapsulation to
dot1q, then the bgp neighbor comes up.
 switchport trunk allowed vlan 10
 switchport mode trunk
 duplex auto
end

SW2#sh run int e2/2
Building configuration...

Current configuration : 206 bytes
!
interface Ethernet2/2
 description FastEthernet0/23, Connects to SW2 Ethernet2/2
 switchport
 switchport trunk encapsulation isl ------> If i change the encapsulation to
dot1q, then the bgp neighbor comes up.
 switchport trunk allowed vlan 10
 switchport mode trunk
 duplex auto
end

Daniel Barney Briseqo
"El zltimo minuto tambiin tiene 60 segundos"
daniel.barney.b_at_hotmail.com

On Feb 5, 2013, at 10:19 PM, marc abel wrote:

> There is no native vlan, all must be encapsulated. This happens by default.
please post configs from both sides of trunk and a "show int trunk" output.
>
>
> On Tue, Feb 5, 2013 at 10:04 PM, Daniel Barney Briseqo
<daniel.barney.b_at_hotmail.com> wrote:
> Ping is not working with ISL.
> On the trunk vlan 10 is allowed but I have not input a native vlan, why
should this be?
> Thank you
> Saludos Cordiales,
> Daniel Barney BriseC1o
> Sent from my iPhone
>
> On Feb 5, 2013, at 9:00 PM, "Lindsay Hill" <lindsay.k.hill_at_gmail.com>
wrote:
>
> > Without seeing your configs, it's probably related to ISL not having a
native VLAN.
> >
> > Have you verified basic connectivity (i.e. ping) from R1 to the SW2 IP
address when using ISL?
> >
> > On 6/02/2013, at 2:42 PM, Daniel Barney Briseqo
<daniel.barney.b_at_hotmail.com> wrote:
> >
> >> hello...
> >> So i have this topology.
> >>
> >> R1-------SW1----(TRUNK ISL)-----SW2
> >>
> >> On R1 I have on the physical interface the ip 10.10.10.1 and on SW2 over
vlan 10, ip 10.10.10.2
> >> when setting up a e-bgp neighbor from R1 to SW2.... if using dot1q on
the trunk the neighbor comes up, but when I use ISL it does not.
> >>
> >> Could you tell me why is this happening?
> >>
> >>
> >> Daniel Barney Briseqo
> >> "El zltimo minuto tambiin tiene 60 segundos"
> >> daniel.barney.b_at_hotmail.com
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>
>
>
> --
> Marc Abel
> CCIE #35470
> (Routing and Switching)

Blogs and organic groups at http://www.ccie.net
Received on Wed Feb 06 2013 - 11:04:51 ART