[c-nsp] Catalyst 2950G Trunking Issue

Thu Mar 29 13:50:16 EST 2007

Hello Juan:

You would think not.  Just for testing, why not set the default-gateway in opposite directions.  So, set it for .1 on the .2 device and .2 on the .1 device.

Mike

From: Juan C. Crespo R. [mailto:jcposeidon at cantv.net] 
Sent: Thursday, March 29, 2007 11:23 AM
To: Michael K. Smith - Adhost
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Catalyst 2950G Trunking Issue

    Michael, the vlan interface on each switch are different (10.0.0.1, 10.0.0.2), the default-gateway is set to 10.0.0.3, but into my knowledge, there is no need to use one router to allow the ping on each one, if they are on the same subnet.  

Michael K. Smith - Adhost escribió: 

Hello:

Okay, top posting.  J Is the default gateway reachable by both devices?  I didn't see an ARP entry that looked like a default gateway, given that only the remote-switch MAC Address.  If you have the same address for both that's either one of the switches or is not reachable then that may cause issues.

Mike

From: Juan C. Crespo R. [mailto:jcposeidon at cantv.net] 
Sent: Thursday, March 29, 2007 10:18 AM
To: Michael K. Smith - Adhost
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Catalyst 2950G Trunking Issue

Ok

The 2950G Switch is L2, and I have the same default-gateway on both.

Thanks

Michael K. Smith - Adhost escribió: 

Hello Juan:

	-----Original Message-----
	From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
	bounces at puck.nether.net] On Behalf Of Juan C. Crespo R.
	Sent: Thursday, March 29, 2007 6:51 AM
	To: cisco-nsp at puck.nether.net
	Subject: Re: [c-nsp] Catalyst 2950G Trunking Issue

	Reposting....

	SWITCH-A#show interfaces gigabitEthernet 0/1 trunk

	Port        Mode         Encapsulation  Status        Native vlan
	Gi0/1       on           802.1q         trunking      1

	Port      Vlans allowed on trunk
	Gi0/1       1,10-25,354,456,845

	Port        Vlans allowed and active in management domain
	Gi0/1       1

	Port        Vlans in spanning tree forwarding state and not pruned
	Gi0/1       1

	SWITCH-A#show interfaces vlan 1
	Vlan1 is up, line protocol is up
	  Hardware is CPU Interface, address is 03b0.24b1.5180 (bia
	03b0.24b1.5180)
	  Internet address is 10.0.0.1/24
	  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 never, 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 0 bits/sec, 0 packets/sec
	  5 minute output rate 0 bits/sec, 0 packets/sec
	     25 packets input, 3264 bytes, 0 no buffer
	     Received 0 broadcasts (0 IP multicast)
	     0 runts, 0 giants, 0 throttles
	     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
	     164 packets output, 0 bytes, 0 underruns
	     0 output errors, 4 interface resets
	     0 output buffer failures, 0 output buffers swapped out

	SWITCH-A# show arp
	Protocol  Address          Age (min)  Hardware Addr   Type   Interface
	Internet  10.0.0.1                -   03b0.24b1.5180  ARPA   Vlan1

	SWITCH-B#show interfaces gigabitEthernet 0/1 trunk

	Port        Mode         Encapsulation  Status        Native vlan
	Gi0/1       on           802.1q         trunking      1

	Port      Vlans allowed on trunk
	Gi0/1       1,10-25,354,456,845

	Port        Vlans allowed and active in management domain
	Gi0/1       1

	Port        Vlans in spanning tree forwarding state and not pruned
	Gi0/1       1

	SWITCH-B#show interfaces vlan 1
	Vlan1 is up, line protocol is up
	  Hardware is CPU Interface, address is 03b2.24b1.5180 (bia
	03b2.24b1.5180)
	  Internet address is 10.0.0.2/24
	  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 never, 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 0 bits/sec, 0 packets/sec
	  5 minute output rate 0 bits/sec, 0 packets/sec
	     210 packets input, 15072 bytes, 0 no buffer
	     Received 0 broadcasts (0 IP multicast)
	     0 runts, 0 giants, 0 throttles
	     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
	     34 packets output, 0 bytes, 0 underruns
	     0 output errors, 4 interface resets
	     0 output buffer failures, 0 output buffers swapped out

	SWITCH-B# show arp
	Protocol  Address          Age (min)  Hardware Addr   Type   Interface
	Internet  10.0.0.2                -   03b2.24b1.5180  ARPA   Vlan1

	SWITCH-B#ping 10.0.0.1

	Type escape sequence to abort.
	Sending 5, 100-byte ICMP Echos to 10.0.0.1, timeout is 2 seconds:
	.....
	Success rate is 0 percent (0/5)

	SWITCH-A#ping 10.0.0.2

	Type escape sequence to abort.
	Sending 5, 100-byte ICMP Echos to 10.0.0.2, timeout is 2 seconds:
	.....
	Success rate is 0 percent (0/5)
	SWITCH-A#

Depending on whether or not your switch is running in L2 or L3 mode, do
you have either a default route, default-gateway or both?  For testing,
you may want to set the appropriate variable to the other device.

Mike