Linking a 2950 & 2900XL

cmourning · ‎12-04-2007

Hello.

I have 2 switches, a 2950 & a 2900XL.

Here is the config for port 24 on both:

SW2900XL#sh int fa0/24 sw

Name: Fa0/24

Switchport: Enabled

Administrative mode: static access

Operational Mode: static access

Administrative Trunking Encapsulation: isl

Operational Trunking Encapsulation: isl

Negotiation of Trunking: Disabled

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: NONE

Pruning VLANs Enabled: NONE

SW2900XL#

%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/24

(0), with SW2950 FastEthernet0/24 (1).

SW2950#show int fa0/24 sw

Name: Fa0/24

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: static access

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: native

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk private VLANs: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Appliance trust: none

SW2950#

01:11:31: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEt

hernet0/24 (1), with 2900XL FastEthernet0/24 (2).

SW2950#

I have 5 cisco 2611 routers. all the E0/0 ports on the routers are plugged into the 2950, and the E0/1 into the 2900XL. i have a serial connection between two of the routers. i want to run a few practice labs and pass traffic between the switches through port 24 on both switches. how can i set this up, in light of the above config?

thanks!

ccbootcamp · ‎12-04-2007

Show us your VTP config from both switches and the running config for both ports.

-brad

www.ccbootcamp.com

(please rate the post if this helps!)

ccbootcamp · ‎12-04-2007

nevermind, looks like your doing ISL trunking on one switch and 802.1q trunking on the other switch. fix it - do isl on the 2950! (the XL switch doesnt support dot1q if memory serves) :)

-brad

http://www.ccbootcamp.com

(please rate the post if this helps!)

cmourning · ‎12-06-2007

ok. i've changed the encapsulation type to dot1q on both switches and the error messages have gone away. i did a show cdp neighbor, and the second switch and all 5 routers appear on both switches. perhaps now, i can begin setting up routing protocols for communication between the routers. i plan to do rip, eigrp and ospf. here is another question: will i have to create vlans for each E0/0 & E0/1 port on each router that are plug into the two switches respectively?

here is the new config:

SW2900XL#sho int fa0/24 sw

Name: Fa0/24

Switchport: Enabled

Administrative mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Negotiation of Trunking: Disabled

Access Mode VLAN: 0 ((Inactive))

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Trunking VLANs Active: 1,10,20

Pruning VLANs Enabled: NONE

SW2900XL#

SW2950#show int fa0/24 sw

Name: Fa0/24

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: static access

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: native

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk private VLANs: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Appliance trust: none

SW2950#

SW2950#show cdp nei

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

SW2900XL Fas 0/24 153 S WS-C2924-XFas 0/24

Router Fas 0/13 144 R 2611 Eth 0/0

Router Fas 0/15 144 R 2611 Eth 0/0

Router Fas 0/14 142 R 2611 Eth 0/0

Router Fas 0/12 140 R 2611 Eth 0/0

Router Fas 0/16 150 R 2611 Eth 0/0

SW2950#

SW2900XL>

SW2900XL>show cdp neigh

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater

Device ID Local Intrfce Holdtme Capability Platform Port ID

SW2950 Fas 0/24 159 S I WS-C2950T-Fas 0/24

Router Fas 0/10 154 R 2611 Eth 0/1

Router Fas 0/14 156 R 2611 Eth 0/1

Router Fas 0/13 135 R 2611 Eth 0/1

Router Fas 0/12 137 R 2611 Eth 0/1

Router Fas 0/11 163 R 2611 Eth 0/1

SW2900XL>

all of the routers have no configuration on them, as i just upgraded the IOS to 12.3(23) (fc5)

I want to build a lab. do i need to create vlans to have separate networks that i can use in a lab environment? also, i want to play around with loopbacks interfaces too.

thanks!