Switching

Hi Guys,

I have a 3750 cisco switch connected to a juniper EX3300 through a trunk.(LAG/LACP)

I have setup the trunk to allow all Vlans.same on my ae0 port.

An Ip was assigned on the sisco side to Vlan 100 with default gateway the juniper IP.

I'm not able to manage the Cisco through it's IP, could you please drive me on what is missing .

Thanks

If it is possible to have a look at configuration and some "show" "show vlan, show interfaces, show ethernet switching table or so on, first have to validate that LAG/LACP are up and good behaving, then have a look at vlan configuration I guess.

This is my configuration:

Juniper Configuration
juniper# show ae0
description "linkagg to 3750 stack";
aggregated-ether-options {
lacp {
active;
}
}
unit 0 {
family ethernet-switching {
port-mode trunk;
vlan {
members [ Lan_z Lan_a all ];
}
}
}

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

juniper# show vlans
Lan_c {
vlan-id 6;
}
Lan_d {
vlan-id 4;
l3-interface vlan.4;
}
Lan_x {
vlan-id 2;
l3-interface vlan.2;
}
Lan_y{
vlan-id 8;
l3-interface vlan.8;
}
Lan_z {
vlan-id 7;
l3-interface vlan.7;
}
Lan_a {
vlan-id 5;
l3-interface vlan.5;
}
Lan_b {
vlan-id 3;
l3-interface vlan.3;
}
default {
l3-interface vlan.0;

------

juniper# run show lacp interfaces
Aggregated interface: ae0
LACP state: Role Exp Def Dist Col Syn Aggr Timeout Activity
ge-0/0/1 Actor No No Yes Yes Yes Yes Fast Active
ge-0/0/1 Partner No No Yes Yes Yes Yes Slow Active
ge-1/0/1 Actor No No Yes Yes Yes Yes Fast Active
ge-1/0/1 Partner No No Yes Yes Yes Yes Slow Active
LACP protocol: Receive State Transmit State Mux State
ge-0/0/1 Current Slow periodic Collecting distributing
ge-1/0/1 Current Slow periodic Collecting distributing

------
juniper# show interfaces ge-0/0/1
description "ae0 linkagg to 3750";
ether-options {
802.3ad ae0;
}
------------
juniper# show interfaces ge-1/0/1
description "ae0 linkagg to 3750";
ether-options {
802.3ad ae0;
}

Cisco Side:

Cisco# show run 

interface Port-channel1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 5,7,100
switchport mode trunk
spanning-tree portfast trunk

---------

cisco#show running-config interface gigabitEthernet 2/0/1
Building configuration...

Current configuration : 197 bytes
!
interface GigabitEthernet2/0/1 
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 5,7,100
switchport mode trunk
channel-group 1 mode active
spanning-tree portfast trunk
end

-----

Same as for interface gi1/0/1 that participate for port-channel.

cisco#show running-config interface vlan 100

!
interface Vlan100
ip address x.x.x.150 255.255.255.240
end

 -----

ip default gateway (juniper ip adress )

Let me know if you need more Info.

Thanks for your help.

Not sure if I well understand, but Juniper does not have vlan 100?

In this case, if you try to reach it through the Juniper ae, it won't work?

You said you set up defulat gw of Cisco as Juniper IP, but in the other way you don't have a way to reach Cisco IP on vlan100?

Correct I have just added Vlan 100 on the juniper side and assigned interface ae0 to it.

------

Junper#sh vlans

Name Tag Interfaces
Admin 100
ae0.0*

-----

When I do a show vlan terse I got the follwoing:

vlan.0 up down inet
vlan.2 up up inet  x.x.x.x/28
vlan.3 up up inet  x.x.x.x/25
vlan.4 up up inet  x.x.x.x/28

do I need to setup an ip for that newly create Vlan 100 ?

Thanks

I guess so, you have to configure for interface vlan.100 the IP you set up as GW for Cisco, regarding your setup?

But this one already exist on the juniper side as Unit 2,

Juniper#sh interface vlan

unit 2 {
description Int;
family inet {
address junipIP/28;

and 

juniper#sh interfaces terse

vlan.2                  up    up   inet     junipIP/28

Once again, not sure I correctly understood your setup but:

Lan_x {
vlan-id 2;
l3-interface vlan.2;

On one side, and vlan 100 on cisco side? There is a tag mismatch here no? Should be 2 or 100 on both sides

On cisco you specify:

interface GigabitEthernet2/0/1 
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 5,7,100

and Juniper uses tag 2 for the same subnet? Could not work if its that.

Thank you , worked now since I setup the trunk to to allow the same vlan 2 as in juniper.

Yay! Thanks for feedback, always appreciated 🙂