Firmware 1.4.0.88 for SG300-52 seems to break DHCP relay

My VLAN to end my switches, so I use a DHCP relay with Option82 to distribute addresses for the subnet of the VIRTUAL LAN. After the transition from 1.3.7.18 to 1.4.0.88, DHCP isn't being delivered on my VLAN. Does anyone else have this problem?

I'm just creating DHCP relay for the first time with my SG 300-28, 1.4.0.88 firmware and noticed that the DHCPDISCOVER promulgated by the relay had the same source and destination (67) port, while the original DHCPDISCOVER used 67 & 68. In addition the 1.3.7.18 firmware is not exchange these autour:

Excerpts from Wireshark:

1.4.088-

Original DHCPDISCOVER to the customer:

User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)

Relayed SG300 DHCPDISCOVER:

User Datagram Protocol, Src Port: bootps (67), Dst Port: bootps (67)

This seems a bit suspect to me

1.3.7.18

Original DHCPDISCOVER to the customer:

User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)

Relayed SG300 DHCPDISCOVER:

User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)

I am not sure that this is your problem (it does not solve my problem), but I want to underline the thought

Tags: Cisco Support

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