CFC linecards on 7600 – traffic punted to RP

7606s-test#show fm sum

Interface: GigabitEthernet6/2 is up
TCAM screening for features: ACTIVE inbound
Interface: Vlan1600 is up
TCAM screening for features: ACTIVE inbound

Gi6/2 is mnagement port on RSP, Vlan1600 is active on Te4/1 in access mode.

!SVI of VLAN active on Te4/1
interface Vlan1600
ip address
no ip redirects
no ip unreachables
no ip proxy-arp
load-interval 30

! null routing of destination IP of packets generated by downstream
device on te4/1
ip route null0

7606s-test#show int vlan 1600
Vlan1600 is up, line protocol is up
30 second input rate 48325000 bits/sec, 100677 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec

CPU utilization for five seconds: 49%/48%; one minute: 48%; five
minutes: 34%

7606s-test#show ibc
Interface information:
Interface IBC0/0(idb 0x18D112A4)
5 minute rx rate 34956000 bits/sec, 72805 packets/sec
5 minute tx rate 0 bits/sec, 0 packets/sec

7606s-test#show netdr captured-packets
——- dump of incoming inband packet ——-
interface Vl1600, routine process_rx_packet_inline, timestamp 03:14:18.723
dbus info: src_vlan 0x640(1600), src_indx 0xC0(192), len 0x40(64)
bpdu 0, index_dir 0, flood 0, dont_lrn 0, dest_indx 0x380(896)
A8020400 06400000 00C00000 40000000 00110524 0E000040 00000000 03802000
destmac 00.21.D8.CB.4B.00, srcmac 00.1B.21.D7.36.74, protocol 0800
protocol ip: version 0x04, hlen 0x05, tos 0x00, totlen 28, identifier 6692
df 0, mf 0, fo 0, ttl 64, src, dst
udp src 3854, dst 10000 len 8 checksum 0x102A

> On 5 Nov 2014, at 18:32, Jiri Prochazka wrote:
>> We will try the same setup with another RSP720-3CXL. I am getting to
>> the point it may be faulty Sup, even it seems very odd for me.
>> Everything works, but uRPF on CFC equipped cards..
> What other features do you have turned on which use up TCAM space?
> It’s sure sounding like a bug, though.
> Also, the output from sh fm sum when the issue is occurring might be
> useful, as well.