help! DHCP in 6509 can't work well

Unanswered Question
Jun 26th, 2010

Hello,everyone!

I have two catlyst 6509(IOS Version 12.2(17a)SX4).And have about 30 vlan.And every vlan have a dhcp pool. cat6509-1 is the dhcp server for each vlan.And two 6509 run HSRP,cat6509-1 is the master .

long long ago, several PCs in vlan16(IP:10.0.15.0/24 , GW:10.0.15.254 in cat6509-1,the real ip is 10.0.15.252 , in cat6509-2 the real ip is 10.0.15.253) sometimes can't obtain IP address,To resolve this we may restart pc or config the static IP address for them.

But yesterday I config  the command in cat6509-1:

(config)#ip dhcp snooping vlan 16

then all PCs in that vlan can't access server (in vlan1 :131.107.0.0/24).And restart several PCs can't obtain IP address from cat6509-1. Then I config the static IP for one of the pc in vlan16 ,and ping 10.0.15.254 timeout  ,ping 10.0.15.252 timeout , ping 10.0.15.253 successful.

To resolve this problem,I cancel this command in cat6509-1:

(config)#no ip dhcp snooping vlan 16

but this can't resolve the problem.

finally , I shutdown interface vlan16 in cat6509-1,and setup a dhcp pool in cat6509-2 ,then cat6509-2 is the master in vlan16 HSRP ,and config a static route in cat6509-1:

(config)#ip route 10.0.15.0 255.255.255.0 10.0.0.2(the manage ip of cat6509-2)

the PCs in vlan16 work well.

but this is the temporary method . I want resolve this problem.

do you know the reason of the problem? And how i resolve it,and reture to normal status?

during this time I find some detail,this maybe helpful.

cat6509-1>show log

Jun 23 19:58:32 CTT: dhcp_snooping_draco2_new_dhcp_pak: failed to setup enqueue,

dropping DHCP packet!

Jun 23 19:58:36 CTT: dhcp_snooping_draco2_new_dhcp_pak: failed to setup enqueue,

dropping DHCP packet!

Jun 23 19:58:42 CTT: dhcp_snooping_draco2_new_dhcp_pak: failed to setup enqueue,

dropping DHCP packet!

Jun 23 19:58:45 CTT: dhcp_snooping_draco2_new_dhcp_pak: failed to setup enqueue,

dropping DHCP packet!

Jun 23 19:58:46 CTT: dhcp_snooping_draco2_new_dhcp_pak: failed to setup enqueue,

dropping DHCP packet!

Jun 23 19:58:47 CTT: dhcp_snooping_draco2_enable_mode_change: dhcp snooping disa

bled for vlan 16

cat6509-1>show int vlan16

Vlan16 is administratively down, line protocol is down

  Hardware is EtherSVI, address is 0011.5d2a.0800 (bia 0011.5d2a.0800)

  Internet address is 10.0.15.252/24

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:01, output 3d00h, output hang never

  Last clearing of "show interface" counters 2d05h

  Input queue: 76/75/556366/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     39569 packets input, 2611554 bytes, 0 no buffer

     Received 317752 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 packets output, 0 bytes, 0 underruns

     0 output errors, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

cat6509-1>

cat6509-1>show ver

Cisco Internetwork Operating System Software

IOS (tm) s72033_rp Software (s72033_rp-PS-M), Version 12.2(17a)SX4, EARLY DEPLOY

MENT RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2004 by cisco Systems, Inc.

Compiled Thu 22-Apr-04 01:44 by pwade

Image text-base: 0x40008FBC, data-base: 0x41C92000

ROM: System Bootstrap, Version 12.2(17r)S2, RELEASE SOFTWARE (fc1)

BOOTLDR: s72033_rp Software (s72033_rp-PS-M), Version 12.2(17a)SX4, EARLY DEPLOY

MENT RELEASE SOFTWARE (fc1)

cat6509-1 uptime is 3 years, 18 weeks, 6 days, 3 hours, 20 minutes

Time since cat6509-1 switched to active is 3 years, 18 weeks, 6 days, 3 hours, 1

9 minutes

System returned to ROM by unknown reload cause - suspect boot_data[BOOT_COUNT] 0

x0, BOOT_COUNT 0, BOOTDATA 19 (SP by power-on)

System restarted at 18:50:07 CTT Thu Feb 15 2007

System image file is "sup-bootflash:s72033-ps-mz.122-17a.SX4.bin"

cisco WS-C6509 (R7000) processor (revision 3.0) with 458752K/65536K bytes of mem

ory.

Processor board ID SAL0825ALSS

SR71000 CPU at 600Mhz, Implementation 0x504, Rev 1.2, 512KB L2 Cache

Last reset from power-on

X.25 software, Version 3.0.0.

Bridging software.

53 Virtual Ethernet/IEEE 802.3  interface(s)

82 Gigabit Ethernet/IEEE 802.3 interface(s)

1917K bytes of non-volatile configuration memory.

8192K bytes of packet buffer memory.

65536K bytes of Flash internal SIMM (Sector size 512K).

Configuration register is 0x2102

cat6509-1>

Thanks in advance

pengyu

I have this problem too.
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