R21xx-HP FlexFabric 11900 TRILL Configuration Guide

8
Adjusting LSP parameters
You can modify the following LSP parameters:
• LSP maximum age—An LSP originated by an RB uses the maximum age as the remaining lifetime.
When the remaining lifetime of an LSP in the LSDB is 0 seconds, the RB removes the LSP's content,
keeps the LSP's digest, and purges the LSP from the network by advertising the LSP that has the
remaining lifetime set to 0.
• LSP refresh interval—When the remaining lifetime of a locally originated LSP is no greater than
(maximum age – refresh interval), the LSP is refreshed even if no change occurs to it. This
mechanism avoids frequent LSP aging and ensures network stability.
• Minimum LSP interval and maximum number of LSPs transmitted per time—To avoid frequent LSP
aging in the network, RBs periodically advertise LSPs. The actual refresh interval of an LSP is
determined by both the minimum LSP interval and the maximum number of LSPs transmitted per time.
To prevent LSPs from being aged out accidentally, set the LSP maximum age and the LSP refresh
interval appropriately.
To adjust LSP-related parameters:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter TRILL view.
trill N/A
3. Set the LSP maximum
age.
timer lsp-max-age time The default setting is 1200 seconds.
4. Set the LSP refresh
interval.
timer lsp-refresh time The default setting is 900 seconds.
5. Return to system view.
quit N/A
6. Enter Layer 2 Ethernet
or aggregate interface
view.
interface interface-type
interface-number
N/A
7. Configure the minimum
LSP interval and the
maximum number of
LSPs transmitted per
time.
trill timer lsp interval [ count
count ]
By default, the minimum LSP interval is 10
milliseconds, and the maximum number of
LSPs transmitted per time is 5.
Configuring distribution tree parameters
In a TRILL network, RBs compute distribution trees according to the LSDB, and use the distribution trees to
guide the forwarding of multicast, broadcast, and unknown unicast frames. An RB with a higher priority
is selected as the root bridge of a distribution tree.
An LSP carries distribution tree information that includes the number of distribution trees that the RB wants
all RBs to compute, the maximum number of distribution trees that the RB can compute (this number is
fixed at 15), and the number of distribution trees that the RB has computed.
An RB determines the number of distribution trees to compute (n) as follows: select the lower value
between the number of distribution trees that the highest-priority RB wants all RBs to compute and the