ZyXEL Communications ES 3500 Series Troubleshooting Manual page 121

Figure 8
Type "L" refers to local interfaces. This indicates that the switch locally has an
IP interface for this destination address. While type "S" refers to static routes.
This indicates that the destination network is not directly connected to this
switch and network is mostly likely across another gateway.
If the uplink gateway has route to network of client with issue, go to step 7.
If the uplink gateway does not have route to network of client with issue, add static
route to network of client with issue and repeat step 2.
Can the client with issue communicate with destination with
issue?
If ping from client with issue to destination with issue is successful, proceed to the
next agenda.
If ping from client with issue to destination with issue is not successful, go to step 8.
Are there any other uplink gateways in your corporate
network?
We now need to troubleshoot the next neighboring network and uplink gateway.
From the illustration below, we started at LAN A, now we will move on to LAN B with a
different set of downlink device and uplink gateway. The downlink device for LAN B
will be the previous uplink gateway in LAN A. Once done with LAN B, move on to
LAN C and so on.
This process ends when the uplink gateway is managed by a different organization,
such as, Internet Service Providers.
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