HP 5300 Informacje Techniczne Pobierz pdf (Strona 372)

Troubleshooting

Unusual Network Activity

1. Configure an ACE that specifically permits authorized traffic from the

remote network.

2. Configure narrowly defined ACEs to block unwanted IP traffic that would

otherwise use the gateway. Such ACEs might deny traffic for a particular

application, particular hosts, or an entire subnet.

3. Configure a “permit any” ACE to specifically allow any IP traffic to move

through the gateway.

Local Gateway Case. If you use the switch as a gateway for traffic you want

routed between subnets, use these general steps to avoid blocking the gateway

for authorized applications:

1. Configure gateway security first for routing with specific permit and deny

statements.

2. Permit authorized traffic.

3. Deny any unauthorized traffic that you have not already denied in step 1.

CDP Problems

The switch does not appear in the CDP Neighbors table of an adjacent

CDP Device. This may be due to any of the following:

■ Either the port connecting the switch to the adjacent device is not a

member of an untagged VLAN or any Untagged VLAN to which the

port belongs does not have an IP address.

■ If there is more than one physical path between the switch and the

other CDP device and STP is running on the switch, then STP will

block the redundant link(s). In this case, the switch port on the

remaining open link may not be a member of an untagged VLAN, or

any untagged VLANs to which the port belongs may not have an IP

address.

■ The adjacent device’s CDP Neighbors table may be full. Refer to the

documentation provided for the adjacent CDP device to determine

the table’s capacity, and then view the device’s Neighbors table to

determine whether it is full.

One or more CDP neighbors appear intermittently or not at all in the

switch’s CDP Neighbors table. This may be caused by more than 60 neigh-

boring devices sending CDP packets to the switch. Exceeding the 60-neighbor

limit can occur, for example, where multiple neighbors are connected to the

switch through non-CDP devices such as many hubs.

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HP 5300 Informacje Techniczne Strona 372