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Beginner

SPAN + DHCP SNOOPING

Here's the current setup:

 

 

 

WS-C3650 Version 16.3.7

switch as dhcp server for both vlans 900 & 901.

Vlan 900 dhcp snooping disabled, span dhcp packets inbound/outbound  ok.

Vlan 901 dhcp snooping enabled , span dhcp packets inbound ok, outbount nok,

span config:

monitor session 1 source interface Te1/0/19 - 22

monitor session 1 destination interface Gi1/0/14

 

The problem only occurs with dhcp packets, all other type of traffic is mirrored, if i disable the dhcp snooping on vlan 901 i'm able to capture the outbound dhcp packets from vlan 901.

 

Does anyone have any past experience with this use case/bug?

 

I've search the online docs regarding ios xe and span, but there isn't any limitations regarding span and dhcp snooping.

 

Thanks for your help.

 

Everyone's tags (4)
2 REPLIES 2
VIP Advisor

Re: SPAN + DHCP SNOOPING

Hello

What would be the role of that destination port when not in a span session regards dhcp snooping- trusted -untrusted 

 

Notice your destination span port is only 1gb but your sources span ports are 2x10gb when snooping is enabled is the utilization of that destination port being overwhelmed?

 



kind regards
Paul

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Beginner

Re: SPAN + DHCP SNOOPING

The destination port is in trusted state, the amount off traffic is small, 10~50Mbps per te port.

 

Now that i recall, i had this same behavior with the monitor capture feature , with the monitor capture the packets are capture to a buffer(ram) so if the problem happens also it must be a bug/limitation in ios. 

 

I will open a case.

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