05-14-2009 12:55 AM - edited 03-06-2019 05:43 AM
I have a three switch stack consisting of
2 3750G-24s
1 3750G-48p
I am trying to connect a 3750 via the gigabit fiber port to a 7206 NPE-400 Sup Engine gigabit port.
The 3750 is using the 1000base-SX SFP
The 7207 is using the 1000base-SX GBIC
After experimenting with the port config, I was able to get both ends to sh up/up, but the connection is very slow.
Doing a ping from the 7206 interface to the switch vlan svi (or vise versa) results in
!..!!
!!!..
!.!!.
I have two DMX devices connected via the gigabit ports to the 48port switch and it is working fine.
Both GBICs on that connection are the same type the small 1000base-sx SFP.
I am getting the same results on all three swithes reying to upling to the 7206.
I have tried numerous different GBICs and cables.
I have tried using nonegotiate on both ends and also configuring both ends to negotiate the connection with the same results.
7206
interface GigabitEthernet0/0
ip address 10.1.7.1 255.255.255.0
ip nbar protocol-discovery
ip route-cache flow
load-interval 30
duplex auto
speed auto
media-type gbic
negotiation auto
end
3750
interface GigabitEthernet1/0/28
switchport access vlan 7
switchport mode access
spanning-tree portfast
or
7206
interface GigabitEthernet0/0
ip address 10.1.7.1 255.255.255.0
ip nbar protocol-discovery
ip route-cache flow
load-interval 30
duplex full
speed 1000
media-type gbic
no negotiation auto
end
3750
interface GigabitEthernet1/0/28
switchport access vlan 7
switchport mode access
speed nonegotiate
spanning-tree portfast
Any thoughts on what could be the problem?
05-15-2009 02:57 PM
I am confused by the connection of a layer-2 switchport (3750) to a layer-3 routed port (7206). Is the ip address of the 3750's vlan interface a 10.1.7.x address?
And why do you have portfast enabled on a port that will connect to another network device? I thought portfast should only be used where a single, non-routing or bridging host is known to be on the other end.
Excuse my lack of knowledge about other methods, but I would connect the two devices with each end being switchports, either both are trunks or both are access ports; or, I would configure the 3750's port as a layer-3 interface with an IP address in the subnet. And I would not have portfast enabled in any case.
As far as layer-1, it's been my experience that Cisco devices connect to each other just fine when allowed to negotiate freely, and nonegotiate is only useful when the far end does not support Cisco's gig-ethernet protocol. Media converters are one example.
05-15-2009 09:31 PM
"I am confused by the connection of a layer-2 switchport (3750) to a layer-3 routed port (7206). Is the ip address of the 3750's vlan interface a 10.1.7.x address?"
Yes, the switchport is a layer 2 port in vlan 7, which connects the two layer three interfaces (The 3750 has an SVI in vlan 7).
I am not sure I understand your suggestion of connecting both ends as switchports.
If the port on the switch is a switchport, how do I make the router interface with an IP address a switchport, unless subinterfaces are created and encapsulated dot1q?
When removing the fiber connection and connecting the ethernet port of the router the same way, it worked fine (which is how it is connected in production right now).
So I don't think portfast is an issue.
Also in my post, I have an example of what you suggest that exibited the same symptoms:
interface GigabitEthernet0/0
ip address 10.1.7.1 255.255.255.0
ip nbar protocol-discovery
ip route-cache flow
load-interval 30
duplex auto
speed auto
media-type gbic
negotiation auto
end
3750
interface GigabitEthernet1/0/28
switchport access vlan 7
switchport mode access
spanning-tree portfast
05-16-2009 11:17 PM
Sshow interface ?
You might have a faulty fiber patch.
06-04-2009 04:54 PM
paolo,
I have tried numerous cables and modules on both ends.
What I have is
gbic 1000base sx -->to--> 1000base sfp
I am seeing a ton of frame errors on the sx side and the reliability is poor.
Is there a problem going from sx to sfp?
It looks like some sort of incapatability between the two modules.
The 7206 side with the sx bgic:
GigabitEthernet0/0 is up, line protocol is up
Hardware is i82543 (Livengood), address is 0011.bb6d.cf08 (bia 0011.bb6d.cf08)
Description: connected to Lakeland LAN
Internet address is 10.100.202.100/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 153/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is autonegotiation, media type is SX
output flow-control is XON, input flow-control is XON
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:03:16, output 00:00:01, output hang never
Last clearing of "show interface" counters 1d06h
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
575 packets input, 208680 bytes, 0 no buffer
Received 564 broadcasts, 88 runts, 0 giants, 0 throttles
1324597283 input errors, 7 CRC, 1324597188 frame, 0 overrun, 0 ignored
0 watchdog, 437 multicast, 0 pause input
0 input packets with dribble condition detected
10048 packets output, 1015769 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
The 3750 side with the sfp:
GigabitEthernet1/0/28 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0011.9362.f91c (bia 0011.9362.f91c)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:21, output 00:00:11, 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 1000 bits/sec, 1 packets/sec
11491 packets input, 1211198 bytes, 0 no buffer
Received 1833 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 1790 multicast, 0 pause input
0 input packets with dribble condition detected
201282 packets output, 21091511 bytes, 0 underruns
0 output errors, 0 collisions, 4 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
05-15-2009 06:38 PM
I agree. Remove the duplex and speed settings from both sides.
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