Hp 2910AL User Manual download pdf (Page 499)

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101

Troubleshooting

Unusual Network Activity

Error (Invalid input) when entering an IP address.

When using the “host” option in the command syntax, ensure that you are not

including a mask in either dotted decimal or CIDR format. Using the “host”

option implies a specific host device and therefore does not permit any mask

entry.

Correct.

Incorrect. No mask needed

to specify a single host.

Figure C-2. Examples of Correctly and Incorrectly Specifying a Single Host

Apparent failure to log all “Deny” Matches.

Where the log statement is included in multiple ACEs configured with a “deny”

option, a large volume of “deny” matches generating logging messages in a

short period of time can impact switch performance. If it appears that the

switch is not consistently logging all “deny” matches, try reducing the number

of logging actions by removing the log statement from some ACEs configured

with the “deny” action.

The switch does not allow any routed access from a specific host, group

of hosts, or subnet.

The implicit deny any function that the switch automatically applies as the last

entry in any ACL may be blocking all access by devices not specifically

permitted by an entry in an ACL affecting those sources. If you are using the

ACL to block specific hosts, a group of hosts, or a subnet, but want to allow

any access not specifically permitted, insert permit any as the last explicit entry

in the ACL.

The switch is not performing routing functions on a VLAN

Two possible causes of this problem are:

■ Routing is not enabled. If show running indicates that routing is not

enabled, use the ip routing command to enable routing.

■ On a switch covered in this guide, an ACL may be blocking access

to the VLAN. Ensure that the switch’s IP address on the VLAN is not

blocked by one of the ACE entries in an ACL applied to that VLAN. A

common mistake is to either not explicitly permit the switch’s IP

address as a DA or to use a wildcard ACL mask in a deny statement

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Hp 2910AL User Manual Page 499

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