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Chapter 20: Checking the Status of Routing Tables
the upper frame. For details on using the Table toolbar, see
with Tables" on page
Table 68. DVMRP Routing table fields
Field
Source IP Address
Source Subnet Mask
Upstream Neighbor
IP Interface
Route Metric
Expiration Time
Up Time
Obtaining DVMRP Next Hop Information
Obtain DVMRP Next Hop information if you want to display information about the next
hop to which the SSR is sending IP multicast packets. This information includes details
about a hop's source and indicates whether the hop has downstream neighbors. To access
such information:
1.
If you are not in the Front Panel view, switch to it by clicking the CoreWatch main
window.
2.
Select the Monitor menu, choose Routing State, choose DVMRP State, and then
choose DVMRP Next Hop Table.
A DVMRP Next Hop table similar to the following appears:
424
443.
Indicates the network address of the source for which the table
entry contains multicast routing information. This address is
combined with a source's network mask to identify that
source.
Indicates the network mask of the source for which the table
entry contains multicast routing information. This mask is
combined with a source's network address to identify that
source.
Identifies the address of the upstream neighbor from which
the source's IP packets are received. The upstream neighbor is
a Reverse Path Forwarding (RPF) neighbor. RPF is a routing
technique that finds the next neighbor by determining which
router send the SSR the packet.
Identifies the index of the interface on which IP datagrams
sent by the source are received.
Indicates the hop count to the source's subnet.
Indicates the minimum amount of time remaining before the
route's entry will be deleted from the DVMRP Routing table.
Indicates how long ago the SSR learned of the route.
Appendix A: "Working
Description
CoreWatch User's Manual
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