06-30-2009 01:59 AM - edited 03-06-2019 06:31 AM
Hi,
I am wondering why our 3750's CPU process increased above 90% after enabling HSRP. It used to be a single SVI until it was converted to HSRP. Can you please help me identify the problem? Thanks in advance.
John
06-30-2009 02:24 AM
This typically happens when route is not known on the switch resulting in packets punted to CPU.
Can you paste
1-HSRP Config
2-show standby
3-show ip route.
Are you using SDM ?
Sam
06-30-2009 02:48 AM
interface Vlan50
description access switch management
ip address 8.99.72.50 255.255.255.224
ip pim sparse-dense-mode
standby 50 ip 8.99.72.33
standby 50 timers msec 500 msec 1500
standby 50 preempt delay minimum 120
end
sjo2-3750G#sh standby vlan 50
Vlan50 - Group 50
State is Active
2 state changes, last state change 1d10h
Virtual IP address is 8.99.72.33
Active virtual MAC address is 0000.0c07.ac32
Local virtual MAC address is 0000.0c07.ac32 (v1 default)
Hello time 500 msec, hold time 1500 msec
Next hello sent in 0.374 secs
Preemption enabled, delay min 120 secs
Active router is local
Standby router is 8.99.72.51, priority 72 (expires in 1.416 sec)
Priority 100 (default 100)
IP redundancy name is "hsrp-Vl50-50" (default)
sjo2-3750G#
sjo2-3750G#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 14.59.0.85 to network 0.0.0.0
14.0.0.0/30 is subnetted, 1 subnets
C 14.59.0.84 is directly connected, Vlan20
8.0.0.0/8 is variably subnetted, 10 subnets, 6 masks
C 8.99.73.0/24 is directly connected, Vlan51
C 8.99.72.1/32 is directly connected, Loopback0
S 8.99.72.0/22 is directly connected, Null0
C 8.99.74.0/24 is directly connected, Vlan55
C 8.99.72.32/27 is directly connected, Vlan50
C 8.99.72.64/26 is directly connected, Vlan52
C 8.104.134.148/30 is directly connected, Vlan10
C 8.99.72.128/27 is directly connected, Vlan53
C 8.99.72.160/27 is directly connected, Vlan54
C 8.99.72.192/26 is directly connected, Vlan1
B* 0.0.0.0/0 [170/0] via 14.59.0.85, 2w6d
sjo2-3750G#
We are just using the default SDM template.
06-30-2009 02:57 AM
are you using this command "sdm prefer routing" or "sdm prefer vlan" ?
06-30-2009 02:59 AM
The CPU is below 20% when we were still not using HSRP. This one is the highest process right now.
70 106474785 689475590 154 63.89% 63.65% 63.25% 0 HLFM address lea
I' reading this right now but cannot find the answer.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/cpu_util.html
Thanks.
06-30-2009 03:00 AM
sjo2-3750G#sh sdm prefer
The current template is "desktop default" template.
The selected template optimizes the resources in
the switch to support this level of features for
8 routed interfaces and 1024 VLANs.
number of unicast mac addresses: 6K
number of IPv4 IGMP groups + multicast routes: 1K
number of IPv4 unicast routes: 8K
number of directly-connected IPv4 hosts: 6K
number of indirect IPv4 routes: 2K
number of IPv4 policy based routing aces: 0
number of IPv4/MAC qos aces: 0.5K
number of IPv4/MAC security aces: 1K
sjo2-3750G#
We are using desktop default.
06-30-2009 03:04 AM
It seems like "sdm prefer routing" might allocate some resources switch woudl need. I have not tested it myself so cannot guarantee it will fix ur issue.
Sam
06-30-2009 03:25 AM
Thank you sir. Hopefully I can find what the real issue is.
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