Comware

Hi,

We just enabled the dhcp-snooping on our switch but next day some of our clients could'nt get ip address. When I checked with my pc I also couldnt get ip. But when I check the binding table I see some clients could get ip address. So what can be the problem? Also I do not see any drops in dhcp-snooping stats.

dhcp-snooping

dhcp-snooping vlan 1

interface 10     //this interface goes to the backbone switch (Cisco, and there is an helper address is configured)
dhcp-snooping trust

Software revision  : R.11.30

Switch model 2610

Packet type Action Reason Count
----------- ------- ---------------------------- ---------
server forward from trusted port 16
client forward to trusted port 10606
server drop received on untrusted port 0
server drop unauthorized server 0
client drop destination on untrusted port 0
client drop untrusted option 82 field 0
client drop bad DHCP release request 0
client drop failed verify MAC check 0

Upgraded the switch to  R.11.72.

Still my pc do not get ip address.

My pc on port 2 and has mac 38-EA-A7-5E-5F-4E , I see only dhcp discover messages.

DSNP DHCP INFORM: port 52, vid 1, from D48564-14F1DB, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP DISCOVER: port 2, vid 1, from 38EAA7-5E5F4E, allow: broadcast on
untrusted input port to trusted output ports.
DSNP DHCP DISCOVER: port 2, vid 1, from 38EAA7-5E5F4E, allow: broadcast on
untrusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.

DSNP DHCP DISCOVER: port 2, vid 1, from 38EAA7-5E5F4E, allow: broadcast on
untrusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from D48564-050C3A, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from D48564-0ACC82, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 001517-1936E5, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP DISCOVER: port 2, vid 1, from 38EAA7-5E5F4E, allow: broadcast on
untrusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 18A905-BCD0DC, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP DISCOVER: port 2, vid 1, from 38EAA7-5E5F4E, allow: broadcast on
untrusted input port to trusted output ports.
DSNP DHCP DISCOVER: port 2, vid 1, from 38EAA7-5E5F4E, allow: broadcast on
untrusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 082E5F-1E3F60, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP DISCOVER: port 2, vid 1, from 38EAA7-5E5F4E, allow: broadcast on
untrusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 1CC1DE-B5B35B, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP ACK: port 52, vid 1, from 649EF3-F0D3FF to 002682-92C3B6 from
server-id: x.x.x.x acked: 0.0.0.0, drop: outbound port unknown.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP DISCOVER: port 2, vid 1, from 38EAA7-5E5F4E, allow: broadcast on
untrusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from D48564-14F1DB, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 78E7D1-A1F6A7, allow: broadcast on
trusted input port to trusted output ports.
DSNP DHCP INFORM: port 52, vid 1, from 000FFE-6AE4E6, allow: broadcast on
trusted input port to trusted output ports.