04-23-2008 08:19 PM - edited 03-03-2019 09:40 PM
Well, we have in subj mentioned hardware with line module X6724SFP+DFC3C, it works as our border - aggregates full views from 4 uplink providers and propagades it to mpls-core.
There is 30 ebgp/ibgp peers & 6 ip-ip tunnels.
Overall traffic-load is about 1,5Gb/sec.
Therewith cpu-load is about 90%!!!
CEF _is_ enabled )))
#show cef state
CEF Status:
RP instance
common CEF enabled
IPv4 CEF Status:
CEF enabled/running
dCEF enabled/running
CEF switching enabled/running
universal per-destination load sharing algorithm, id 3EA34FD7
IPv6 CEF Status:
CEF disabled/not running
dCEF disabled/not running
universal per-destination load sharing algorithm, id 3EA34FD7
RRP state:
I am standby RRP: no
RF Peer Presence: no
RF PeerComm reached: no
RF Progression blocked: never
Redundancy mode: sso(3)
CEF NSF sync: disabled/not running
CEF ISSU Status:
FIBHWIDB broker
No slots are ISSU capable.
FIBIDB broker
No slots are ISSU capable.
FIBHWIDB Subblock broker
No slots are ISSU capable.
FIBIDB Subblock broker
No slots are ISSU capable.
Adjacency update
No slots are ISSU capable.
IPv4 table broker
No slots are ISSU capable.
CEF push
No slots are ISSU capable.
#show logg
...
Apr 24 00:15:32: %CFIB-SP-7-CFIB_EXCEPTION: FIB TCAM exception, Some entries will be software switched
Apr 24 00:15:34: %CFIB-DFC4-7-CFIB_EXCEPTION: FIB TCAM exception, Some entries will be software switched
...
#show ip route summary
IP routing table name is default (0x0)
IP routing table maximum-paths is 32
Route Source Networks Subnets Replicates Overhead Memory (bytes)
connected 0 37 0 1924 6364
static 8 24 0 1700 5504
ospf 1 1 92 0 6324 17856
Intra-area: 17 Inter-area: 0 External-1: 0 External-2: 76
NSSA External-1: 0 NSSA External-2: 0
bgp 29648 129539 125567 0 13265512 43878232
External: 254935 Internal: 171 Local: 0
internal 3585 10635920
Total 133133 125720 0 13275460 54543876
Where should we seek for resolving?
04-24-2008 05:37 AM
Hi,
The error that you are getting "CFIB-SP-7-CFIB_EXCEPTION" suggests that the amount of available space in the TCAM is exceeded which is resulting in high CPU. This is a FIB TCAM limitation.
Once TCAM is full, a flag will be set and FIB TCAM exception is received. This stops from adding new routes to the TCAM. Therefore, everything will be software switched. The removal of routes does not help resume hardware switching.
Once the TCAM enters the exception state,
the system must be reloaded to get out of that state. So try reloading the router.
The maximum routes that can be installed in TCAM is increased by the mls cef maximum-routes command.
-> Sushil
04-24-2008 10:45 PM
And so?
Do we need to upgrade our RSP&DFC to 3CXL for support of existing routing scheme?
Or we can just buy 1-2 Gb CEF720 memory for pfc/dfc?
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