extreme switch connected to cisco switch and losing packet

[Siva2]

Hi All



Can someone help me, I have 2 ExtremeXOS 440 switches version 21.1.1.4 connected to cisco switch 6500.

Problem : when I’ doing continues ping I’m getting packet loss and when one switch responding to my pings another will not respond vice vasa .



This is my configuration on extreme switches

create vlan "internal-man-105"

configure vlan internal-man-105 tag 105

configure vlan internal-man-105 add ports 2:24 tagged

configure vlan internal-man-105 ipaddress 1.1.1.1 255.255.255.248

enable ipforwarding vlan internal-man-105

configure ports 2:24 auto on speed 1000 duplex full



this is my configuration on cisco switch



interface GigabitEthernet3

description Extreme-switch Uplink

switchport

switchport mode trunk

logging event link-status

logging event trunk-status

logging event bundle-status

logging event spanning-tree status

logging event subif-link-status

load-interval 30

keepalive 30

speed 1000

duplex full

udld port aggressive

mls qos trust cos

flowcontrol receive on

flowcontrol send on

spanning-tree portfast edge trunk

spanning-tree bpduguard enable



end

[Karthik_Mohando]

configure ports 2:24 auto on speed 1000 duplex full as per the port number 2:24 it looks like a stacking switch to me but anyways can you share the "show switch" output from both the switches ?

[Patrick_Koppen]

Hi Siva,

error counters look normal (pause is strange...). Could you tell us a little more about you problem?

• What is the IP of your laptop?
• Which port is you laptop connected to?
• What are the exact timings of the packet losses (e.g. loss after every 30 seconds, or work for 10 seconds, stopps for 60 seconds....)?

But still... it could be anything...

Regards
Patrick

[Karthik_Mohando]

Siva, Are the two switches(10.1.1.2,10.1.1.3) are in stacking? If so can you post the "show switch" output from both the switches?

[Patrick_Koppen]

Hi Siva,

on EXOS you turned auto-negotiation on and advertise only 1000/full.

Are you sure duplex full and speed 1000 does not turn auto-negotiation off on cisco?
Spanningtree or udld could be a problem. You should look at the error counters, fdb,
spanningtree, link state, ..... Turn on logging on IOS and EXOS. Does any happen?
Link los, errors disable, duplicate ip, arp change, TCN, ...?

show ip int brief
show interface
show controllers GigabitEthernet3
....

Regards
Patrick

[Erik_Auerswald]

Hi Nick,

"speed 1000" on Cisco IOS does not disable auto-negotiation, it just restricts the advertised speeds to gigabit only. This is a trap I have seen many people fall into when trying to interconnect non-Cisco and Cisco switches with a "fixed" speed of 1000.

Thanks,
Erik