Hi
I’m trying to connect a 1GB SFP port on a catalyst 3750 to a Mellanox sn2100 switch.
The ports on the Mellanox switch are all QSFP, so I’ve got a QSFP to SFP adapter module in there as below:
https://www.fs.com/uk/products/75320.html
So then into that I’ve got the following optic:
https://www.fs.com/uk/products/75332.html?attribute=947&id=214720
Then in the port on the cisco 3750 I’ve got the following optic:
https://www.fs.com/uk/products/11774.html
And finally the following fibre between them:
https://www.fs.com/uk/products/43142.html?attribute=240&id=99291
The ports at both ends are configured as 1GB.
The issue I’ve got is that the cisco switch doesn’t seem to recognize that anything is connected to it whereas the Mellanox things that is connected. See below output for the port status, note it has detected the SFP but says line protocol is down:
#show interface gi1/0/26
GigabitEthernet1/0/26 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 001f.caf7.f59a (bia 001f.caf7.f59a)
Description: "Trunk to fsw01-port 7"
MTU 1522 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Auto-duplex, Auto-speed, 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 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
168 packets input, 50240 bytes, 0 no buffer
Received 168 broadcasts (168 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 168 multicast, 0 pause input
0 input packets with dribble condition detected
480706 packets output, 77019048 bytes, 0 underruns
0 output errors, 0 collisions, 1 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
If I then do the equivalent on the Mellanox switch, it thinks it is connected:
net show interface swp7
Name MAC Speed MTU Mode
-- ---- ----------------- ----- ---- ----------
UP swp7 04:3f:72:30:90:04 1G 1500 BondMember
Alias
-----
core3-port26
cl-netstat counters
-------------------
RX_OK RX_ERR RX_DRP RX_OVR TX_OK TX_ERR TX_DRP TX_OVR
----- ------ ------ ------ ----- ------ ------ ------
0 0 0 0 4028 0 0 0
Routing
-------
Interface swp7 is up, line protocol is up
Link ups: 2 last: 2021/04/19 21:02:23.20
Link downs: 14 last: 2021/04/19 21:01:39.11
PTM status: disabled
vrf: default
OS Description: mer-c3750-core3-port26
index 46 metric 0 mtu 1500 speed 1000
flags: <UP,BROADCAST,RUNNING,MULTICAST>
Type: Unknown
HWaddr: 04:3f:72:30:90:04
Interface Type Other
Master interface: bond0
Does anyone have any thoughts on why the catalyst switch won’t recognise that something is connected to the port?
I have enabled the use of non-cisco SFPs with the command “service unsupported-transceiver" but this hasn’t helped.
It’s been suggested that I would need to reboot the switch in order for the “service unsupported-transceiver" to take effect. I can’t reboot the switch at the moment so I’ve arranged a maintenance window next week to try this but in the mean time can anyone advise on anything else that could be causing this issue?
Many thanks
