Hello all,
Cisco does it again...
[1] How can i see if a port has autonegotiated to a certain speed and duplex, and not been configured for a fixed speed or duplex ?
I am trying to determine how the server connected to this port is configured (can be 1000 fixed, or auto-neg)
Eth125/1/20 SRV xxxx S connected 1000 full 1000 --
The port config is:
interface Ethernet125/1/20
description SRV xxxx S
switchport access vlan 1000
spanning-tree guard root
So, I assume this one has autonegotiated ?
Where is the a-full a-1000 in the sh int status then ?
I have to use the command:"sh run int eth125/1/20 all" ?
interface Ethernet125/1/20
description SRV xxxx S
lacp port-priority 32768
lacp rate normal
lldp transmit
lldp receive
no switchport block unicast
no switchport block multicast
no hardware multicast hw-hash
cdp enable
switchport
switchport mode access
no switchport dot1q ethertype
no switchport priority extend
switchport access vlan 1000
spanning-tree port-priority 128
spanning-tree cost auto
spanning-tree link-type auto
spanning-tree port type edge
spanning-tree bpduguard enable
spanning-tree guard root
no spanning-tree bpdufilter
speed auto
duplex auto
flowcontrol receive off
flowcontrol send on
link debounce
no beacon
snmp trap link-status
logging event port link-status default
logging event port trunk-status default
mdix auto
no shutdown lan
load-interval counter 1 30
load-interval counter 2 300
no load-interval counter 3
no shutdown
So, it must have autonegotated, but it is not clear from "sh int status"
sh int eth125/1/20
Ethernet125/1/20 is up
Hardware: 100/1000 Ethernet, address: 0007.7daf.9f15 (bia 0007.7daf.9f15)
Description: SRV xxxx S
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is access
full-duplex, 1000 Mb/s -> no indication of auto-neg either
Beacon is turned off
Input flow-control is off, output flow-control is on
Switchport monitor is off
EtherType is 0x8100
Last link flapped 2d06h
Last clearing of "show interface" counters 4d15h
30 seconds input rate 80 bits/sec, 10 bytes/sec, 0 packets/sec
30 seconds output rate 1224 bits/sec, 153 bytes/sec, 1 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 104 bps, 0 pps; output rate 1.19 Kbps, 1 pps
RX
0 unicast packets 66859 multicast packets 0 broadcast packets
66859 input packets 5616156 bytes
0 jumbo packets 0 storm suppression packets
0 giants 0 input error 0 short frame 0 overrun 0 underrun
0 watchdog 0 if down drop
0 input with dribble 0 input discard
0 Rx pause
TX
4886 unicast packets 487748 multicast packets 360719 broadcast packets
853353 output packets 97647243 bytes
0 jumbo packets
0 output errors 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble
0 Tx pause
3 interface resets
[2] Do the N2K ports even support auto duplex and half duplex ??
sh int eth125/1/20 cap
Ethernet125/1/20
Model: N2K-C2248TP-1GE
Type (Non SFP): --
Speed: 100,1000,auto
Duplex: full -> doh ? no auto ? no half ? only full supported ?
Trunk encap. type: 802.1Q
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off/on),tx-(off/on)
Rate mode: none
QOS scheduling: rx-(6q1t),tx-(1p6q0t)
CoS rewrite: no
ToS rewrite: no
SPAN: yes
UDLD: no
Link Debounce: yes
Link Debounce Time: yes
MDIX: no
Pvlan Trunk capable: yes
TDR capable: no
Port mode: Switched
FEX Fabric: no
POE capable: no
[3] Once speed is configured, is autonegotiation disabled maybe ?
interface Ethernet125/1/12
description SRV xxxxx S
switchport access vlan 1000
spanning-tree guard root
speed 100
I am getting a lot of errors on this interface:
sh int count error
--------------------------------------------------------------------------------
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards
--------------------------------------------------------------------------------
Eth125/1/12 19101784 30372 0 19132156 0 0
Can only be the case if the other port has been configured 100 full fixed, we would autoneg to 100 half then ? However, how can i see ?
sh run int Eth125/1/12 all
interface Ethernet125/1/12
description SRV xxxxx S
lacp port-priority 32768
lacp rate normal
lldp transmit
lldp receive
no switchport block unicast
no switchport block multicast
no hardware multicast hw-hash
cdp enable
switchport
switchport mode access
no switchport dot1q ethertype
no switchport priority extend
switchport access vlan 1000
spanning-tree port-priority 128
spanning-tree cost auto
spanning-tree link-type auto
spanning-tree port type edge
spanning-tree bpduguard enable
spanning-tree guard root
no spanning-tree bpdufilter
speed 100
duplex auto
flowcontrol receive off
flowcontrol send on
link debounce
no beacon
snmp trap link-status
logging event port link-status default
logging event port trunk-status default
mdix auto
no shutdown lan
load-interval counter 1 30
load-interval counter 2 300
no load-interval counter 3
no shutdown
sh int eth125/1/12
Ethernet125/1/12 is up
Hardware: 100/1000 Ethernet, address: 0007.7daf.9f0d (bia 0007.7daf.9f0d)
Description: SRV xxx S
MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec,
reliability 230/255, txload 16/255, rxload 1/255
Encapsulation ARPA
Port mode is access
full-duplex, 100 Mb/s
--> mmm , doesn't seem the case, it shows "full" duplex, if it is full duplex auto-neg, then the other side is also in auto-neg, and errors can't be happening. Thanks for the inconsistency....
sh version
Software
BIOS: version 1.3.0
loader: version N/A
kickstart: version 5.0(3)N2(1)
system: version 5.0(3)N2(1)
BTW: it seems TDR cable diagnostics can only be run on N5K ports, not N2K ports (even if they are "ethernet"..):
test cable-diagnostics tdr interface eth125/1/12
TDR tests can be run only on ethernet ports
regards,
GN
