H3C Technologies H3C S6300 Series Switches - Manual (Page 18)

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shorter Hello interval consumes more system resources. The adjacency holding time is obtained by
multiplying the Hello interval by the Hello multiplier. The RB advertises the adjacency holding time
to neighbors through Hello frames. If a neighbor does not receive any Hello frame from the RB
before the adjacency holding time expires, it removes the TRILL adjacency with the RB.
• Inhibition time—An RB that acts as the AVF of a VLAN guarantees that frames from the VLAN have
only one incoming port or one outgoing port along a link. When other RBs receive frames from the
VLAN, they do not perform any processing. However, when the RB detects that a root bridge
change occurs on a link or that the AVF advertised by other RBs conflicts with the local AVF, the RB
inhibits the local AVF for a certain time to avoid loops. When the inhibition time expires, if the RB
is still the AVF of the VLAN, the RB restores the role of AVF.
• CSNP interval—On a broadcast network, the DRB advertises CSNPs at the CSNP interval to
perform network-wide LSDB synchronization. A CSNP records all LSP digests of the local LSDB.
When an RB receives a CSNP, the RB compares the CSNP against the local LSDB to verify whether
some LSPs are aged out or missing. If the CSNP has an LSP digest that the local LSDB does not have,
the RB sends a PSNP packet to request the LSP.
To configure TRILL timers:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet
or aggregate interface
view.
interface interface-type
interface-number
N/A
3. Set the Hello interval. trill timer hello interval
The default setting is 10 seconds.
This command sets the Hello interval for the
RB. The Hello interval of the DRB is 1/3 of the
Hello interval of the RB, so that the DRB
failures can be quickly detected.
4. Set the Hello multiplier. trill timer holding-multiplier
count
The default setting is 3.
5. Set the inhibition time. trill timer avf-inhibited time The default setting is 30 seconds.
6. Set the CSNP interval. trill timer csnp interval The default setting is 10 seconds.
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.
• Maximum length of an LSP originated by an RB—The actual maximum LSP length is determined by
the smallest of following values:
{
The configured value.