Viewing cached destination information
View the destination cache to see next-hop addresses for destinations.
The destination cache is only populated or updated when IPv6 packets are locally originated on the central processor of the switch.
The main purpose of the destination cache is to store, on a per-destination basis, the dynamic Path MTU value currently used when transmitting packets from the local system to the remote destination. The PMTU value itself is used to calculate how many bytes can fit into an individual packet before fragmentation should be applied.
Before you begin
Change the VRF instance as required to view cached destination information on a specific VRF instance. Not all parameters are configurable on non-default VRFs.
Procedure
- In the navigation tree, expand the following folders:
- Click IPv6.
- Click the Destination Cache tab.
Destination Cache field descriptions
Use the data in the following table to use the Destination Cache tab.
|
Name |
Description |
|---|---|
|
DestAddr |
Shows the IPv6 destination address. |
|
Interface |
Shows the interface number that is used to reach the destination. |
|
NextHop |
Shows the IPv6 address for the next hop to the destination. |
|
IfType |
Specifies the interface type (tunnel, VLAN, or brouter) or virtual circuit (VRRP, RSMLT). |
|
IfData |
Displays additional information about virtual circuits. For instance, for a VRRP or RSMLT the virtual router ID displays. If the interface type is tunnel, VLAN, or brouter, no additional information displays. |
|
Pmtu |
Shows the path maximum transmission unit (MTU) for the destination. |
|
PmtuAge |
Shows the time, in seconds, since an ICMPv6 packet too big message was received. |