Re: bgp neighbor and ISL trunk

*You should go through your configuration one step at a time and verify
each step after configuring it:*

* *

*On R1*

R1(config)#*int f0/0*

R1(config-if)#*IP addr 10.10.10.1 255.255.255.0*

R1(config-if)#*No shut*

*On SW1*

SW1(config)#*Int F0/1*

SW1(config-if)#*Swi mode acc*

SW1(config-if)#*Swi acc v 10*

SW1(config-if)#*No shut*

SW1(config-if)#*Int F0/20*

SW1(config-if)#*Swi trunk encapsulation isl*

SW1(config-if)#*Swi mode trunk*

SW1(config-if)#*No shut*

SW1(config)#*VTP domain test*

Changing VTP domain name from NULL to test

*On SW2*

Sw2(config)#*Int F0/20*

Sw2(config-if)#*Swi trunk encapsulation isl*

Sw2(config-if)#*Swi mode trunk*

Sw2(config-if)#*No shut*

*Try to verify the configuration:*

*On SW1*

SW1#*Show int trunk*

Port Mode Encapsulation Status Native vlan

Fa0/20 on isl trunking 1

Port Vlans allowed on trunk

Fa0/20 1-4094

Port Vlans allowed and active in management domain

Fa0/20 1,10

Port Vlans in spanning tree forwarding state and not pruned

Fa0/20 10

*On SW2*

Sw2#*Show int trunk*

Port Mode Encapsulation Status Native vlan

Fa0/20 on isl trunking 1

Port Vlans allowed on trunk

Fa0/20 1-4094

Port Vlans allowed and active in management domain

Fa0/20 1,10

Port Vlans in spanning tree forwarding state and not pruned

Fa0/20 1,10

*On SW2*

Sw2(config)#*Int vlan 10*

Sw2(config-if)#*IP address 10.10.10.2 255.255.255.0*

Sw2#*Show ip int br | exc unass*

Interface IP-Address OK? Method Status Protocol

*Vlan10 10.10.10.2 YES manual up up***

*To test the configuration:*

* *

*On R1*

R1#*Ping 10.10.10.2*

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:

*..!!!*

*Success rate is 60 percent (3/5), round-trip min/avg/max = 1/2/4 ms*

*Now lets configure BGP:*

*On R1*

R1(config)#*Router bgp 100*

R1(config-router)#*No* *au*

R1(config-router)#*Neighbor 10.10.10.2 remote 200*

*On SW2*

R1(config)#*Router bgp 100*

R1(config-router)#*No* *au*

R1(config-router)#*Neighbor 10.10.10.1 remote 100*

*You should see the following console message:*

*%BGP-5-ADJCHANGE: neighbor 10.10.10.1 Up*

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
> >>
> >>
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>

--
*Narbik Kocharians
*CCSI#30832, CCIE# 12410 (R&S, SP, Security)
*www.MicronicsTraining.com* <http://www.micronicstraining.com/>
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