H3C Technologies H3C S6800 Series Switches - Manual (Page 20)

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• Hello interval and Hello multiplier—The RB advertises Hello frames at the Hello interval to maintain
a TRILL adjacency. The shorter the Hello interval, the faster the network convergence. However, a
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
within the adjacency holding time, it removes the TRILL adjacency with the RB.
• AVF inhibition time—As the AVF of a VLAN, the RB guarantees that frames of the VLAN enter and
leave a broadcast network through the same port. Other RBs on the broadcast network do not
process frames from the VLAN.
To avoid loops, the RB suppresses its AVF role during the inhibition time when one of the following
conditions exists:
{
The RB detects a root bridge change on the broadcast network.
{
Other RBs advertise a different AVF for the VLAN.
When the inhibition time expires, the RB restores its AVF role if it is still the AVF of the VLAN.
• CSNP interval—On a broadcast network, the RB advertises CSNPs at the CSNP interval to perform
network-wide LSDB synchronization if it is elected as the DRB. A CSNP records all LSP digests of the
RB's local LSDB. A remote RB compares a received CSNP against its 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 remote 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. Configure the Hello
interval.
trill timer hello interval
The default setting is 10 seconds.
This command sets the Hello interval for an
RB. The Hello interval of a DRB is 1/3 of the
Hello interval of an RB. This allows for DRB
failures to be quickly detected.
4. Configure the Hello
multiplier. trill timer holding-multiplier
count
The default setting is 3.
5. Configure the AVF
inhibition time.
trill timer avf-inhibited time The default setting is 30 seconds.
6. Configure the CSNP
interval.
trill timer csnp interval The default setting is 10 seconds.
Configuring TRILL LSP parameters and features
Setting TRILL LSP parameters
You can set the following LSP parameters: