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Webcast-Catalyst9k
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Config removal on 6500 (IOS) - URGENT

Hello,

I added a static IP/MAC entry on a 6500 MSFC2 daughter card (IOS) but now no longer need it, and wont to remove it. However it wont let me remove it from the config... I can't reload this switch as its a core switch and would have service impact.

6500 code: c6msfc2-dsv-mz.121-26.E6.bin

PORR6501#sh run | in 10.1.163

arp 10.1.163.39 0014.c25e.0c82 ARPA

PORR6501(config)#no arp 10.1.163.39 0014.c25e.0c82 ARPA

PORR6501(config)#

PORR6501#sh run | in 10.1.163

arp 10.1.163.39 0014.c25e.0c82 ARPA

Any ideas how to remove this? As a side point, I have another 6500 running the same code, and this removed the ARPA entry without any problems.

rgds

Phil

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Config removal on 6500 (IOS) - URGENT

Phil,

Looks like you are running into bug id CSCsa98860.

If a static ARP entry is added to a configuration using the arp ip-address mac-address arpa command, then the entry cannot be deleted from the configuration when you use the no arp ip-address mac-address arpa command. This problem occurs when the address of the static entry that belongs to a subnet is configured on a routed interface as secondary. This problem is resolved in Release 12.1(27b)E. (CSCsa98860)

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.1E/hybrid/release/notes/OL_2309.html

So, the fix is a code upgrade. As a workaround you can try this. Create a routed interface , configure a bogus primary IP Address. Then set a secondary IP Address with the same subnet as the arp entry. After that, try deleting the arp entries.

Example workaround:

switch(config)#in lo100

switch(config-if)#ip add 99.99.99.99 255.255.255.255

switch(config-if)#ip add 10.1.163.39 255.255.255.0 secondary

switch(config-if)#exit

switch(config)#no arp 10.1.163.39 0014.c25e.0c82 ARPA

I hope it helps.

Regards,

Arul

** Please rate all helpful posts **

1 REPLY
Cisco Employee

Re: Config removal on 6500 (IOS) - URGENT

Phil,

Looks like you are running into bug id CSCsa98860.

If a static ARP entry is added to a configuration using the arp ip-address mac-address arpa command, then the entry cannot be deleted from the configuration when you use the no arp ip-address mac-address arpa command. This problem occurs when the address of the static entry that belongs to a subnet is configured on a routed interface as secondary. This problem is resolved in Release 12.1(27b)E. (CSCsa98860)

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.1E/hybrid/release/notes/OL_2309.html

So, the fix is a code upgrade. As a workaround you can try this. Create a routed interface , configure a bogus primary IP Address. Then set a secondary IP Address with the same subnet as the arp entry. After that, try deleting the arp entries.

Example workaround:

switch(config)#in lo100

switch(config-if)#ip add 99.99.99.99 255.255.255.255

switch(config-if)#ip add 10.1.163.39 255.255.255.0 secondary

switch(config-if)#exit

switch(config)#no arp 10.1.163.39 0014.c25e.0c82 ARPA

I hope it helps.

Regards,

Arul

** Please rate all helpful posts **

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