12-04-2007 08:05 PM - last edited on 03-25-2019 03:57 PM by ciscomoderator
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!
12-04-2007 08:17 PM
Show us your VTP config from both switches and the running config for both ports.
-brad
(please rate the post if this helps!)
12-04-2007 08:18 PM
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
(please rate the post if this helps!)
12-06-2007 04:34 PM
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!
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