08-22-2014 03:43 AM - edited 03-07-2019 08:29 PM
Our Nexus 6K config
6K1:
interface Vlan24
no shutdown
vrf member ggn1
no ip redirects
ip address 192.168.24.4/28
hsrp 24
preempt delay reload 60
priority 150
ip 192.168.24.6
6k1(config)# show run | sec spanning
spanning-tree vlan 1-3967 priority 0
------
6k2:
interface Vlan24
no shutdown
vrf member ggn1
no ip redirects
ip address 192.168.24.5/28
hsrp 24
preempt delay reload 60
priority 5
ip 192.168.24.6
6K2# show run | sec spanning
spanning-tree vlan 1-3967 priority 0
----
Now while Doing a ping from a 192.168.24.x machine we get:
[root@usergate ~]# ping 192.168.24.6
PING 192.168.24.6 (192.168.24.6) 56(84) bytes of data.
64 bytes from 192.168.24.6: icmp_seq=1 ttl=255 time=42.8 ms
64 bytes from 192.168.24.6: icmp_seq=2 ttl=255 time=0.690 ms
64 bytes from 192.168.24.6: icmp_seq=3 ttl=255 time=41.3 ms
64 bytes from 192.168.24.6: icmp_seq=4 ttl=255 time=0.695 ms
64 bytes from 192.168.24.6: icmp_seq=5 ttl=255 time=41.6 ms
64 bytes from 192.168.24.6: icmp_seq=6 ttl=255 time=0.722 ms
64 bytes from 192.168.24.6: icmp_seq=7 ttl=255 time=37.3 ms
64 bytes from 192.168.24.6: icmp_seq=8 ttl=255 time=0.705 ms
Why does my Ping has inconsistent times?
---
All HSRP are active on Nexus 6K1
When I do a traceroute to the HSRP IP of Vlan 108 from a machine in another vlan we get:
[root@usergate ~]# traceroute 192.168.108.1
traceroute to 192.168.108.1 (192.168.108.1), 30 hops max, 60 byte packets
1 192.168.108.40 (192.168.108.40) 3.649 ms 192.168.24.4 (192.168.24.4) 0.478 ms 192.168.108.40 (192.168.108.40) 3.848 ms
[root@usergate ~]# traceroute 192.168.108.1
traceroute to 192.168.108.1 (192.168.108.1), 30 hops max, 60 byte packets
1 192.168.108.40 (192.168.108.40) 2.725 ms 192.168.24.4 (192.168.24.4) 0.449 ms 192.168.108.40 (192.168.108.40) 2.854 ms
[root@usergate ~]# traceroute 192.168.108.1
traceroute to 192.168.108.1 (192.168.108.1), 30 hops max, 60 byte packets
1 192.168.108.40 (192.168.108.40) 3.675 ms 3.835 ms 4.016 ms
[root@usergate ~]# traceroute 192.168.108.1
traceroute to 192.168.108.1 (192.168.108.1), 30 hops max, 60 byte packets
1 192.168.108.40 (192.168.108.40) 2.905 ms 192.168.24.4 (192.168.24.4) 0.586 ms 1.076 ms
08-22-2014 06:51 AM
Hi,
with this output i have to ask my magic 8 ball. sorry.
but if you use vPC why don't you use glbp (don't forget NXOS5.2 and lower GLBP do not support IPV6). My magic 8 ball means that you could maybe have a problem that you forwarding traffic over your vPC-Peerlink.
But i don't know your design or from where do your icmp-request +-reply starts / end. but it seems layer3 (udp33434) has the problem, too.
regards,
flo
08-22-2014 07:48 AM
Just found out that with VPC Peer running it is mandate to have STP priority 0 on both the switches.
But this inconsistent Ping on the Network is really worrying me. The reason I am troubleshooting on this is that at times for a few minutes the network becomes very latent and Ping times to even Internal Network rises and there is a huge latency problem.
CPU, memory on the nexus switches seems to be normal, Interface errors on a few interfaces, but I really cannot nail down the problem to anything specific then I came across this behavior.
08-22-2014 08:16 AM
Even with VPC you still need to define which switch is the root and which one is backup root.
for example: if you want switch 1 to be the primary root for MST instance 1 then you need this command:
spanning-tree mst 1 root primary
and switch 2 secondary
spanning-tree mst 1 root secondary
HTH
08-23-2014 04:04 AM
My spanning Tree configuration on both the switches is:
spanning-tree mode rapid-pvst
spanning-tree pathcost method short
no spanning-tree port type edge default
no spanning-tree port type network default
spanning-tree bridge assurance
no spanning-tree loopguard default
spanning-tree vlan 1-3967
spanning-tree vlan 1-3967 priority 0
spanning-tree vlan 1-3967 hello-time 2
spanning-tree vlan 1-3967 fex-hello-time 12
spanning-tree vlan 1-3967 forward-time 15
spanning-tree vlan 1-3967 max-age 20
What are the recommended configuration changes?
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