[cisco-nas] port-channel cef bug?

[Nemeth Laszlo]

Hello

The last night i created a port-channel between the C7206 and a c3550 
switch. The config can working to 10-12 hours, and this morning the cpu 
usage of the 7200 is very high, but the traffic is not change. The users 
is sed, no output traffic, and accounts (l2tp) are dropped.

The MRTG pictures of the traffic and cpu usage are attached to this mail.

So, I rebooted the 7200 (it is in the left side on the 
adsl-gw-cpu-day.png), and now all is work fine, but the uptime is only 
34 minutes.

It's a ios bug?

Thanx
csirek

-----

System image file is "disk2:c7200-is-mz.122-16.B2.bin"
cisco 7206VXR (NPE-G1) processor (revision A) with 245760K/16384K bytes 
of memory.
Processor board ID 16079126
SB-1 CPU at 700Mhz, Implementation 1, Rev 0.2, 512KB L2 Cache
6 slot VXR midplane, Version 2.0



I use the "ip route-cache cef" in all interfaces.

It is the port-channel's config output now:

adsl-gw#sh inter stat
GigabitEthernet0/1
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                Processor    3745450 3758362917      16412    1676485
              Route cache          0          0    3148347  660674574
                    Total    3745450 3758362917    3164759  662351059
GigabitEthernet0/2
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                Processor      18457    2163046      76125    6346517
              Route cache    6440315 1575461944    7523230 3314959607
                    Total    6458772 1577624990    7599355 3321306124
GigabitEthernet0/3
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                Processor    3888697 3734846453      80882    5860900
              Route cache          0          0    3220771  696959297
                    Total    3888697 3734846453    3301653  702820197
Port-channel1
           Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                Processor     105908   42642849      97011    7529484
              Route cache    7616962 3214598751    6439024 1372357638
                    Total    7722870 3257241600    6536035 1379887122


The good conf:

ip cef
!
vpdn enable
vpdn multihop
vpdn logging
vpdn logging local
vpdn logging remote
vpdn logging user
vpdn search-order domain
!
vpdn-group 12
! Default L2TP VPDN group
  accept-dialin
   protocol l2tp
   virtual-template 1
  local name extadslgw
  lcp renegotiation always

interface GigabitEthernet0/1
  ip address 192.168.1.1 255.255.255.0
  ip route-cache cef
  media-type rj45

interface GigabitEthernet0/2
  mtu 1552
  ip address 10.3.0.50 255.255.255.252
  load-interval 30
  duplex auto
  speed auto
  media-type gbic
  negotiation auto
  no cdp enable

interface Virtual-Template1
  mtu 1492
  ip unnumbered GigabitEthernet0/1
  ip nat inside
  ip load-sharing per-packet
  no logging event link-status
  load-interval 30
  peer default ip address pool adsl
  ppp authentication pap


!!!!!!!!!!!!!!!!!!!!!!!!!
and the bad conf (with port-channel):
!!!!!!!!!!!!!!!!!!!!!!!!!

ip cef
vpdn enable
vpdn multihop
vpdn logging
vpdn logging local
vpdn logging remote
vpdn logging user
vpdn search-order domain
!
vpdn-group 12
! Default L2TP VPDN group
  accept-dialin
   protocol l2tp
   virtual-template 1
  local name extadslgw
  lcp renegotiation always
!
interface Port-channel1
  ip address 192.168.1.1 255.255.255.0
  no ip redirects
  no ip proxy-arp
  ip nat outside
  duplex full
  no cdp enable
  hold-queue 150 in
!
interface GigabitEthernet0/1
  no ip address
  load-interval 30
  duplex full
  speed 100
  media-type rj45
  no negotiation auto
  channel-group 1
  no cdp enable
!
interface GigabitEthernet0/2
  mtu 1552
  ip address 10.3.0.50 255.255.255.252
  load-interval 30
  duplex auto
  speed auto
  media-type gbic
  negotiation auto
  no cdp enable
!
interface GigabitEthernet0/3
  no ip address
  load-interval 30
  duplex full
  speed 100
  media-type rj45
  no negotiation auto
  channel-group 1
  no cdp enable
!
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