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October 1st, 2024 12:10
shutting down a port on a N1548 switch should turn it off, right? :)
So i have a stack with 2x N1548 and one N1524P. One of the N1548 is the master.
A certain server is connected to port Gi/1/0/38 there.
I have double checked that the mac of the IP of that server is right there.
So i do
enable
conf
interface Gigabitethernet Gi1/0/38
shutdown
But the IP still answers ping. What could be wrong?
When i check with this
show interfaces gigabitethernet 1/0/38
It says
...
Link status... shut /None
...
No Events found!
DELL-Chris H
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October 1st, 2024 18:49
Alexander-36725
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October 3rd, 2024 07:35
Its still pingable... And yes, it (that server) sure has other connections going on, its a server serving and doing stuff :)
But does this mean that "shutdown" simply doesnt work? I mean, in essence i kinda have to turn the server off to disable the port (?), which very much defeats the purpose.
DELL-Erman O
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October 3rd, 2024 09:10
Hmm... just thinking, switch might still remember the server’s IP address and link it to the server’s MAC address, even though the server is turned off. This could be causing the connection issues. Could it be related with arp list? You can check "no arp ip access-list acl-name" or "arp delete <IP address>" commands.
Alexander-36725
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October 4th, 2024 07:00
Ok, so i tried just "show arp", and it only shows 3 IPs (that server is not one of them).
It should show many more IPs by the way, there is a bunch of servers connected to that switch (stack).
All these 3 are management IPs (the first two are know to me, and the last third is some internal mgm IP i guess?)
Also, i seem to have "arp purge" and not "arp delete" on this switch. Its an N1548 switch.
mlmsw4-1>show arp
Static ARP entries are only active
when the IP address is reachable on a local subnet
Age Time (seconds)............................. 600
Response Time (seconds)........................ 1
Retries........................................ 4
Cache Size..................................... 893
Dynamic Renew Mode ............................ Enable
Total Entry Count Current / Peak .............. 2 / 2
Static Entry Count Configured / Active / Max .. 0 / 0 / 16
IP Address MAC Address Interface Type Age
--------------- ----------------- -------------- -------- -----------
10.10.253.1 CC96.E5EB.04B6 Vl1 Gateway 0h 0m 18s
10.10.253.41 684F.6453.1912 Vl1 Local n/a
250.251.252.254 0202.BC80.0002 Management Dynamic n/a
DELL-Erman O
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October 4th, 2024 08:42
Thanks for checking it. You mentioned stack, if there is any redundancy or alternative paths in your network, traffic can reach the server via a different route. This comes to my mind though not sure.