Does anyone know the bug ID for 3750 dropping arp packets

astanislaus · ‎01-06-2009

One of my customers sent the following information to me.

Is this a documented bug?

What is the bug ID?

IOS bug on 3750 switches 12.2(37)SE

Switch drops arp packets to certain mac addresses with version 12.2(37)SE.

Wwitches sharing cat3750 architecture may drop arp packets destined to mac addresses that are close to switch own mac address block

Workaround 1

- downgrade to 12.2(35)SE

OR

Workaround 2

- If affected device supports it, change the mac address for which arps are dropped (very likely the mac address affected will also be of Cisco device)

for example

interface e0/0

mac-address 0000.1234.5678

Issue is being investigated

crow930us · ‎01-06-2009

CSCsj19641 Bug Details

Status - Fixed

Severity 2 - severe

Last Modified - In Last Year

Product - Cisco IOS software

Technology - IP Addressing Services

1st Found-In

12.2(37)SE

12.2(35)EX

12.2(35)EX1

12.2(37)EX

12.2(40)EX

12.2(40)EX1

12.2(40)EX2

12.2(35)SE

12.2(35)SE1

12.2(35)SE2

12.2(35)SE3

12.2(35)SE4

12.2(35)SE5

12.2(37)SE

12.2(44)SE

12.2(44)SE1

12.2(44)SE2

Known Affected Versions

Fixed-In

12.2(37)EY

12.2(37)SE1

12.2(40)SE

sbhadrav@cisco.com · ‎05-01-2018

Enabling DAI with Port-Channel breaks ARP processing
DHCP snooping on port-channel breaks.
 
Conditions:
1. Configure the required for DAI, DHCP snooping

2. Setup an DHCP server

3. Setup an Cross-Stack Port-Channel between DHCP and Access switch

4. Enable arp inspection for the client vlan

5. Bring up the Client interface

6. Client would be able to get an ip address, binding added to snooping table 
Run a continous ping from client

7. From the client side clear the arp binding (arp -d) was used

8. Once the ARP cache was cleared from client; client traffic drops

9. Binding table still holds the entry for the client

10.Tried Release / Renew, works fine client can renew ip address still traffic drops

11.Disable "ip arp inspection" for the client vlan - traffic resumes

12.Enable ip arp inspection again ; traffic drops