Trunking - what am I doing wrong??????

Feb 28, 2005 3 Replies

Hello all! What is missing?



Ok here goes?



I wnat to connect two Catalys 2950 in a trunk mode. The connection is made using port 48 from switch LISAN017 to port 20 of switch LISAN006.



Here is the configuration for switch LISAN017



LISAN017#show interface FastEthernet 0/48 switchport Name: Fa0/48 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 2 (interna) 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: 2,100 Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Appliance trust: none


LISAN017#show interfaces trunk



Port Mode Encapsulation Status Native vlan Fa0/48 on 802.1q trunking 2 Po1 on 802.1q trunking 2



Port Vlans allowed on trunk Fa0/48 2,100 Po1 none



Port Vlans allowed and active in management domain Fa0/48 2,100 Po1 none



Port Vlans in spanning tree forwarding state and not pruned Fa0/48 none Po1 none


LISAN017#show interface Vlan 2 Vlan2 is up, line protocol is up Hardware is CPU Interface, address is 0012.d967.b340 (bia 0012.d967.b340) Internet address is 57.227.235.89/23 MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set ARP type: ARPA, ARP Timeout 04:00:00 Last input 1d18h, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 1000 bits/sec, 2 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 432877 packets input, 32298093 bytes, 0 no buffer Received 247647 broadcasts (0 IP multicast) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 225092 ignored 29637 packets output, 2253056 bytes, 0 underruns 0 output errors, 2 interface resets 0 output buffer failures, 0 output buffers swapped out


And for switch LISAN006


LISAN006#show interface FastEthernet 0/20 switchport Name: Fa0/20 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 2 (interna) 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: 2,100 Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Appliance trust: none



LISAN006#show interfaces trunk



Port Mode Encapsulation Status Native vlan Fa0/20 on 802.1q trunking 2 Po1 on 802.1q trunking 2



Port Vlans allowed on trunk Fa0/20 2,100 Po1 none



Port Vlans allowed and active in management domain Fa0/20 2,100 Po1 none



Port Vlans in spanning tree forwarding state and not pruned Fa0/20 2,100 Po1 none



LISAN006#show interface Vlan 2 Vlan2 is up, line protocol is up Hardware is CPU Interface, address is 000f.2479.d8c0 (bia 000f.2479.d8c0) Internet address is 57.227.235.88/23 MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 4000 bits/sec, 6 packets/sec 5 minute output rate 9000 bits/sec, 8 packets/sec 966048 packets input, 75123372 bytes, 0 no buffer Received 256341 broadcasts (0 IP multicast) 0 runts, 0 giants, 13 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 1460405 packets output, 124633446 bytes, 0 underruns 0 output errors, 1 interface resets 0 output buffer failures, 0 output buffers swapped out


Both ligths are grenn and blinking.



I'm able to ping LISAN006 but not LISAN017. WHY????



Best regards and thaknx,



-vcf



Did you use a crossover cable, just wondering?

Pruning VLANs Enabled: 2-1001: if the vlans are pruned on the link how will they communicate ?

This will only allow vlan 1 across the link. To test this theroy disable pruning and use switchport trunk allowed

also confirm that the vlans are in the vlan database (this one has caught me out a few times)

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required