HP 6125XLG Installation manual

HP 6125XLG Blade Switch
TRILL
Command Reference
Part number: 5998-3742
Software version: Release 2306
Document version: 6W100-20130912

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i
Contents
TRILL commands···························································································································································· 1
display trill adjacent-table ·······································································································································1
display trill brief························································································································································1
display trill fib ···························································································································································2
display trill graceful-restart status····························································································································3
display trill interface·················································································································································5
display trill lsdb ························································································································································6
display trill mfib ingress···········································································································································9
display trill mfib transit·········································································································································· 10
display trill multicast-route ···································································································································· 11
display trill neighbor-table···································································································································· 13
display trill peer····················································································································································· 14
display trill rpf-table··············································································································································· 15
display trill unicast-route ······································································································································· 16
graceful-restart ······················································································································································· 16
graceful-restart interval·········································································································································· 17
log-peer-change enable ········································································································································ 17
multicast-ecmp enable··········································································································································· 18
reset trill ·································································································································································· 19
timer lsp-max-age ·················································································································································· 19
timer lsp-refresh······················································································································································ 20
tree-root priority ····················································································································································· 21
trees calculate ························································································································································ 21
trill ··········································································································································································· 22
trill announcing-vlan ·············································································································································· 22
trill drb-priority ······················································································································································· 23
trill enable ······························································································································································ 24
trill link-type ···························································································································································· 25
trill timer avf-inhibited············································································································································ 26
trill timer csnp························································································································································· 27
trill timer hello ························································································································································ 27
trill timer holding-multiplier ··································································································································· 28
trill timer lsp···························································································································································· 29
Support and other resources ·····································································································································31
Contacting HP ································································································································································ 31
Subscription service ·············································································································································· 31
Related information························································································································································ 31
Documents······························································································································································ 31
Websites································································································································································· 31
Conventions ···································································································································································· 32
Index ···········································································································································································34

1
TRILL commands
display trill adjacent-table
Use display trill adjacent-table to display the TRILL adjacency table.
Syntax
display trill adjacent-table [ count | nickname nickname interface interface-type interface-number ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
count: Displays the number of entries.
nickname nickname: Displays information about the RB specified by its nickname. The nickname is a
hexadecimal number in the range of 0x1 to 0xFFFE. If no RB is specified, the command displays
information about all RBs.
interface interface-type interface-number: Displays information on an interface specified by its type and
number. If no interface is specified, the command displays information about all interfaces.
Examples
# Display all entries in the TRILL adjacency table.
<Sysname> display trill adjacent-table
NextHop MAC address Interface
0x899b 00e0-fc58-123a FGE1/1/1
# Display the number of entries in the TRILL adjacency table.
<Sysname> display trill adjacent-table count
Total number of TRILL ADJ entries: 3
Table 1 Command output
Field Description
NextHop Nickname of the next-hop RB.
MAC address MAC address of the next-hop RB.
Interface Outgoing port of frames.
Total number of TRILL ADJ entries Number of entries in the TRILL adjacency table.
display trill brief
Use display trill brief to display brief TRILL information.

2
Syntax
display trill brief
Views
Any view
Predefined user roles
network-admin
network-operator
Examples
# Display brief TRILL information.
<Sysname> display trill brief
Network entity: 00.00a0.fc00.5806.00
Nickname: 0xfa1b
Tree-root priority: 32768
Cost style: Wide
Maximum allowed LSP received: 1470
Maximum allowed LSP originated: 1470
Timers:
LSP-max-age: 1200s
LSP-refresh: 900s
Interval between SPFs: 10ms
Table 2 Command output
Field Descri
p
tion
Network entity Name of the network entity.
Nickname Nickname of the RB.
Tree-root priority Priority to be a distribution tree root.
Cost style Cost type, which must be Wide.
Maximum allowed LSP received Maximum length of an LSP allowed to be received.
Maximum allowed LSP originated Maximum length of an LSP that can be originated.
Timers TRILL timers.
LSP-max-age LSP maximum age (in seconds).
LSP-refresh LSP refresh interval (in seconds).
Interval between SPFs SPF calculation interval (in milliseconds).
display trill fib
Use display trill fib to display the TRILL FIB.
Syntax
display trill fib [ count | nickname nickname ]

3
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
count: Displays the number of entries.
nickname nickname: Displays information about the RB specified by its nickname. The nickname is a
hexadecimal number in the range of 0x1 to 0xFFFE. If no RB is specified, the command displays
information about all RBs.
Examples
# Display all entries in the TRILL FIB.
<Sysname> display trill fib
Flags: T-Transit, E-Egress
Destination HopCount NextHop Interface Flags
0xfa1b 63 N/A N/A E
0x899b 63 0x2a5c FGE1/1/1 T
# Display the number of entries in the TRILL FIB.
<Sysname> display trill fib count
Total number of TRILL FIB destinations: 5
Total number of TRILL FIB entries: 5
Table 3 Command output
Field Description
Destination Nickname of the destination RB.
HopCount Number of hops to the destination RB.
NextHop Nickname of the next hop RB.
Interface Outgoing port of frames.
Total number of TRILL FIB destinations Number of destination RBs in the TRILL FIB.
Total number of TRILL FIB entries Number of entries in the TRILL FIB.
display trill graceful-restart status
Use display trill graceful-restart status to display GR status information about TRILL.
Syntax
display trill graceful-restart status
Views
Any view
Predefined user roles
network-admin

4
network-operator
Examples
# Display GR status information about TRILL.
<Sysname> display trill graceful-restart status
Restart status: RESTARTING
Restart phase: LSDB synchronization
Restart interval: 300s
T3 remaining time: 140s
Total number of interfaces: 1
Number of waiting LSPs: 3
T2 remaining time: 55s
Interface: FortyGigE1/1/1
T1 remaining time: 2s
RA received: Y
CSNP received: N
T1 expiration number: 1
Table 4 Command output
Field Descri
p
tion
Restart status
Restart status:
•COMPLETE—GR is complete.
•RESTARTING—GR of the Restart type is in process.
•STARTING—GR of the Start type is in process.
Restart phase
Restart phase:
•Finish—GR is complete.
•LSDB synchronization—T2 synchronization phase.
•LSDB generation—LSP generation phase.
•MCS synchronization—Layer 2 multicast data synchronization phase.
•SPF—Route calculation phase.
Restart interval Restart interval (in seconds).
T3 remaining time Remaining time of the T3 timer (in seconds). The initial value is 65535 seconds,
and is updated according to the remaining time in the RA packet.
Total number of interfaces Total number of interfaces in the process.
T2 remaining time
Remaining time of the T2 timer (in seconds). The initial value of the field is fixed
at 60 seconds for GR of the Restart type and is the value (300 seconds by
default) set by using the graceful-restart interval command for GR of the Start
type.
Interface Port name.
T1 remaining time Remaining time of the T1 timer (in seconds). The initial value of the field is 3
seconds.
RA received
RA received flag bit:
•Y—Set.
•N—Not set.

5
Field Descri
p
tion
CSNP received
CSNP received flag bit:
•Y—Set.
•N—Not set.
T1 expiration number Number of T1 timer expirations. The maximum value of the field is 10.
display trill interface
Use display trill interface to display TRILL information about an interface.
Syntax
display trill interface [ interface-type interface-number ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
interface-type interface-number: Specifies an interface by its type and number. If no interface is specified,
the command displays TRILL information about all interfaces.
Examples
# Display TRILL information about all interfaces.
<Sysname> display trill interface
Interface: FortyGigE1/1/1
Protocol state: UP
Nickname: 0xfa1b
MTU: 1470
DRB: Yes
Link type: Access
CSNP timer: 10s
Hello timer: 10s
Hello multiplier: 3
LSP timer: 10ms
LSP transmit-throttle count: 5
Cost: 2000
AVF inhibited timer: 30s
Priority: 64
Active AVF:
1-3, 5, 58
Inhibited AVF: None

6
Table 5 Command output
Field Descri
p
tion
Protocol state
State of TRILL:
•UP.
•DOWN.
Nickname Nickname of the RB.
MTU MTU (in bytes) of the link.
DRB
Whether the RB is elected as a DRB:
•Yes—The RB is elected as a DRB.
•No—The RB is not elected as a DRB.
Link type
TRILL port type:
•Access.
•Hybrid.
•Trunk.
CSNP timer CSNP interval, in seconds.
Hello timer Hello interval, in seconds.
Hello multiplier Hello multiplier.
LSP timer Minimum LSP interval, in milliseconds.
LSP transmit-throttle count Maximum number of LSPs transmitted per time.
Cost Link cost of the port.
AVF inhibited time Inhibition time, in seconds.
Priority DRB priority.
Active AVF VLANs for which the RB is specified as the AVF by the DRB on the port.
None indicates that the RB is not specified as the AVF for any VLAN.
Inhibited AVF VLANs whose AVFs are inhibited on the port. None indicates that no
such VLAN exists on the port.
display trill lsdb
Use display trill lsdb to display TRILL link state database (LSDB) information.
Syntax
display trill lsdb [ local | lsp-id lsp-id | verbose ] *
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
local: Displays information about the locally originated LSPs.

7
lsp-id lsp-id: Displays information about an LSP specified by its ID. The lsp-id argument is in the format of
SYSID.Pseudonode ID-fragment num, where SYSID is the SystemID of the originating node or
pseudo-node and fragment num is the fragment number of the LSP. If no LSP is specified, the command
displays information about all LSPs.
verbose: Displays detailed information. If this keyword is not specified, the command displays brief LSDB
information.
Examples
# Display brief information about the TRILL LSDB.
<Sysname> display trill lsdb
Flags: * - Self LSP
LSP ID Seq num Checksum Holdtime Length Overload
---------------------------------------------------------------------------
00a0.fc00.5806.00-00* 0x00000005 0xd315 361 78 0
# Display detailed information about the TRILL LSDB.
<Sysname> display trill lsdb verbose
LSP ID: 00a0.fc00.5806.00-00*
Sequence number: 0x00000005
Checksum: 0xd315
Holdtime: 1145s
Length: 78
Overload: 0
Source: 00a0.fc00.5806.00
TRILL version: 0x00
Nickname:
Nickname: 0xfa1b
Priority: 64
Tree-root priority: 32768
Trees:
Compute trees number: 1
Max compute trees number: 15
Used trees number: 1
Tree identifiers:
0x899b
Trees used identifiers:
0x899b
Interested VLANs:
Start: 4, End: 4, M4: 0, M6: 0
Start: 5, End: 6, M4: 1, M6: 0
Neighbor:
ID: 00e0.fc58.123a.01, Cost: 2000
Group address:
VLAN ID: 2
Group MAC address: 0100-5e01-0101
Table 6 Command output
Field Descri
p
tion
LSP ID LSP ID. An asterisk (*) after an ID indicates that the LSP is locally originated.

8
Field Descri
p
tion
Seq num/Sequence
number Sequence number of the LSP.
Checksum Checksum of the LSP.
Holdtime Remaining lifetime of the LSP (in seconds).
Length LSP length.
Overload
Whether the Overload flag in the LSP is set:
•0—Not set.
•1—Set.
Source Number of the originating RB.
TRILL version Highest TRILL version supported by the originating RB.
Nickname
Nickname information about the originating RB:
•Nickname—Nickname of the RB.
•Priority—Priority to hold the nickname.
•Tree-root priority—Priority to be a distribution tree root.
Trees
Distribution tree computation information about the originating RB:
•Compute trees number—Number of distribution trees that the RB wants all RBs
to compute.
•Max compute trees number—Maximum distribution trees that the RB can
compute.
•Used trees number—Number of distribution trees to use when the RB is an
ingress RB.
Tree identifiers Distribution trees that the originating RB requires other RBs to compute when the
originating RB has the highest priority to be the distribution tree root.
Trees used identifiers Distribution trees used by the originating RB when the RB is an ingress RB.
Interested VLANs
Information about VLANs that use the originating RB as the AVF:
•Start—Start VLAN ID.
•End—End VLAN ID.
•M4—Whether an IPv4 multicast router exists in the VLAN range:
{0—Exists.
{1—Does not exist.
•M6—Whether an IPv6 multicast router exists in the VLAN range:
{0—Exists.
{1—Does not exist.
Neighbor
Nickname information about the originating RB:
•ID—ID of the neighbor.
•Cost—Cost of the link to the neighbor.
Group address
Multicast MAC address information about the originating RB:
•VLAN ID—ID of the VLAN to which the multicast MAC addresses belong.
•Group MAC address—Multicast group listeners.

9
display trill mfib ingress
Use display trill mfib ingress to display the information about ingress entries in the TRILL MFIB.
Syntax
display trill mfib ingress [ vlan vlan-id [ local-entry | remote-entry ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
vlan vsan-id: Displays the information in the VLAN specified by its VLAN ID. The vlan-id argument is in
the range of 1 to 4094. If no VLAN is specified, the command displays information about all VLANs.
local-entry: Displays information about local ingress entries. The frames sent out of the ports in the local
ingress entries do not need the TRILL encapsulation.
remote-entry: Displays information about remote ingress entries. The frames sent out of the ports in the
remote ingress entries need the TRILL encapsulation.
Usage guidelines
If neither local-entry or remote-entry is specified, this command displays information about local and
remote ingress entries.
Examples
# Display all ingress entries in the TRILL MFIB.
<Sysname> display trill mfib ingress
======================================================================
Ingress type: Local entry
VLAN ID: 1
Ports:
FGE1/1/1
======================================================================
Ingress type: Remote entry
VLAN ID: 1
RootNickName: 0x5092
Ports:
FGE1/1/2
Table 7 Command output
Field Descri
p
tion
Ingress type
Type of ingress entries:
•Local entry.
•Remote entry.
VLAN ID VLAN ID of the entry.

10
Field Descri
p
tion
RootNickName Nickname of the root bridge.
Ports Ports of the entry.
display trill mfib transit
Use display trill mfib transit to display the information about egress entries in the TRILL MFIB.
Syntax
display trill mfib transit [ nickname nickname [ prune-entry | rpf-entry | vlan vlan-id [ mac-address
mac-address ] ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
nickname nickname: Displays information about the RB specified by its nickname. The nickname is a
hexadecimal number in the range of 0x1 to 0xFFFE. If no RB is specified, the command displays
information about all RBs.
prune-entry: Displays information about pruned entries. If this keyword is not specified, the command
displays information about all entries.
rpf-entry: Displays information about RPF entries. If this keyword is not specified, the command displays
information about all entries.
vlan vsan-id: Displays the information in the VLAN specified by its VLAN ID. The vlan-id argument is in
the range of 1 to 4094. If no VLAN is specified, the command displays information about all VLANs.
mac-address mac-address: Displays information about a specified MAC address. If no MAC address is
specified, the command displays information about all MAC addresses.
Examples
# Display all egress entries in the TRILL MFIB.
<Sysname> display trill mfib transit
======================================================================
Transit type: RPF entry
RootNickName: 0x5092
InNickName: 0x5092
Port: FGE1/1/1
======================================================================
Transit type: RB entry
RootNickName: 0x5092
Flag: Egress/Transit
Ports:
FGE1/1/1

11
======================================================================
Transit type: VLAN RB entry
RootNickName: 0x5092
VLAN ID: 1
Flag: Egress/Transit
Ports:
FGE1/1/1
Table 8 Command output
Field Descri
p
tion
Transit type
Type of egress entries:
•RB entry.
•RPF entry.
•VLAN RB entry—RB entries of the specified VLAN.
•MAC VLAN RB entry—RB entries of the specified VLAN and MAC address.
RootNickName Nickname of the root bridge.
InNickName Nickname of the ingress RB of the entry.
VLAN ID VLAN ID of the entry.
MAC address MAC address of the entry.
Flag
Entry type:
•Egress—Egress entries.
•Transit—Transit entries.
•Egress/Transit—Both transit and egress entries.
Port/Ports Ports of the entry.
display trill multicast-route
Use display trill multicast-route to display the TRILL multicast routing table information, which includes the
next-hop outgoing port list for multicast frames, broadcast frames, and unknown unicast frames based on
the multicast distribution trees.
Syntax
display trill multicast-route [ tree-root nickname [ vlan vlan-list [ mac-address mac-address ] ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
tree-root nickname: Displays the TRILL multicast routing table information for the distribution tree rooted
at the specified RB. The nickname argument is a hexadecimal number in the range of 0x0 to 0xFFFF. If
this option is not specified, the command displays information about the TRILL multicast routing table.

12
vlan vlan-list: Displays the information within the specified VLAN. The vlan-list argument specifies
multiple VLANs in the form of { vlan-id [ to vlan-id ] }&<1-10>, where vlan-id is a VLAN ID in the range
of 1 to 4094 and &<1-10> indicates that you can specify up to ten vlan-id [ to vlan-id parameters. If no
VLAN is specified, the command displays information about all VLANs.
mac-address mac-address: Displays information about a specified MAC address. If no MAC address is
specified, the command displays information about all MAC addresses.
Examples
# Display all information about the TRILL multicast routing table.
<Sysname> display trill multicast-route
Root Flag
-------------------------------------
0x899b Valid
# Display the TRILL multicast routing table information for the distribution tree rooted at the RB whose
nickname is 0x899B.
<Sysname> display trill multicast-route tree-root 899b
Root: 0x899b
LocalRcvFlag: True
List of VLANs:
1 to 10, 13, 40, 60 to 85, 200, 1001
List of outgoing ports:
FGE1/1/1
FGE1/1/2
FGE1/1/3
# Display the TRILL multicast routing table information for the distribution tree rooted at the RB whose
nickname is 0x899B in VLAN 1.
<Sysname> display trill multicast-route tree-root 899b vlan 1
Root: 0x899b
VLAN: 1
LocalRcvFlag: False
List of outgoing ports:
FGE1/1/1
FGE1/1/2
FGE1/1/3
List of IPv4 multicast-router ports:
FGE1/1/1
FGE1/1/2
List of IPv6 multicast-router ports:
FGE1/1/2
FGE1/1/3
List of MAC addresses:
0000-1111-00ee
00ff-1111-00ff
00ef-1111-00ef
0000-111f-00ff
# Display the TRILL multicast routing table information about MAC address 0011-11FF-0022 for the
distribution tree rooted at the RB whose nickname is 0x899B in VLAN 1.
<Sysname> display trill multicast-route tree-root 899b vlan 1 mac-address 0011-11ff-0022

13
Root: 0x899b
VLAN: 1
MAC address: 0011-11ff-0022
LocalRcvFlag: True
List of outgoing ports:
FGE1/1/3
FGE1/1/4
Table 9 Command output
Field Descri
p
tion
Root Nickname of the RB acting as the root bridge of the distribution tree.
VLAN ID of the VLAN.
Flag
Whether the root bridge is valid:
•Invalid.
•Valid.
LocalRcvFlag
Local receiving flag:
•False—The local end does not decapsulate the TRILL frame.
•True—The local end decapsulates the TRILL frame and forwards the
frame.
List of outgoing ports Outgoing port list. None indicates that no outgoing port exists.
List of VLANs VLAN list. None indicates that no VLAN exists.
List of IPv4 multicast-router ports Port list of the IPv4 multicast router.
List of IPv6 multicast-router ports Port list of the IPv6 multicast router.
List of MAC addresses MAC address list.
display trill neighbor-table
Use display trill neighbor-table to display the TRILL neighbor table.
Syntax
display trill neighbor-table
Views
Any view
Predefined user roles
network-admin
network-operator
Examples
# Display the TRILL neighbor table.
<Sysname> display trill neighbor-table
NextHop MAC address Interface
--------------------------------------------------------------------------
0x899b 00e0-fc58-123a FGE1/1/1

14
Table 10 Command output
Field Descri
p
tion
NextHop Nickname of the next hop RB.
MAC address MAC address of the next hop.
Interface Outgoing port.
display trill peer
Use display trill peer to display the TRILL neighbor statistics.
Syntax
display trill peer [ interface interface-type interface-number ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
interface interface-type interface-number: Specifies an interface by its type and number. If no interface
is specified, the command displays information about all interfaces.
Examples
# Display the TRILL neighbor statistics of interface FortyGigE 1/1/1.
<Sysname> display trill peer interface fortygige 1/1/1
System ID: 00e0.fc58.123a
Interface: FortyGigE1/1/1
Circuit ID: 00e0.fc58.123a.01
State: Up
HoldTime: 8s
DRB priority: 64
Nickname: 0x899b
Uptime: 00:38:15
Table 11 Command output
Field Descri
p
tion
System ID System ID of the neighbor.
Interface Local TRILL port directly connected to the neighbor.
Circuit ID LSP number of the pseudo node.
State
Neighbor state:
•Up.
•Down.

15
Field Descri
p
tion
Holdtime
Remaining holding time (in seconds) of the adjacency. If no Hello frame is received from
a neighbor within the holding time, the neighbor is considered invalid. When a Hello
frame is received from a neighbor within the holding time, the holding time is restarted.
DRB priority DRB priority of the neighbor port.
Nickname Nickname of the neighbor.
Uptime Time for which the adjacency has been held.
display trill rpf-table
Use display trill rpf-table to display the TRILL RPF check table.
Syntax
display trill rpf-table tree-root nickname
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
tree-root nickname: Displays the TRILL RPF check table information for the distribution tree rooted at the
specified RB. The nickname argument is a hexadecimal number in the range of 0x0 to 0xFFFF.
Usage guidelines
The TRILL RPF check table is used to check whether the incoming port of a broadcast, multicast, or
unknown unicast frame is valid. According to the nicknames of the egress RB (root bridge of the
distribution tree to which the frame belongs) and ingress RB in the frame, the RPF check feature checks
whether the actual incoming port of a frame is the same as the incoming port specified in the RPF entry.
If they are different, the frame is considered invalid and is dropped.
Examples
# Display the TRILL RPF check table information for the distribution tree rooted at the RB whose nickname
is 0x899B.
<Sysname> display trill rpf-table tree-root 899b
Ingress-nickname Expected-rcv-ports
---------------------------------------------
0x1fff FGE1/1/1
0x1ff0 FGE1/1/2
0x0ffe FGE1/1/3
Table 12 Command output
Field Descri
p
tion
Ingress-nickname Nickname of the ingress RB.
Expected-rcv-ports Expected incoming port.

16
display trill unicast-route
Use display trill unicast-route to display the TRILL unicast routing table.
Syntax
display trill unicast-route [ verbose ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
verbose: Displays detailed information. If this keyword is not specified, the command displays brief
information.
Examples
# Display the TRILL unicast routing table information.
<Sysname> display trill unicast-route
Destination Interface NextHop
-----------------------------------------------
0xfa1b N/A N/A
0x899b FGE1/1/1 Direct
# Display the detailed TRILL unicast routing table information.
<Sysname> display trill unicast-route verbose
Destination: 0xfa1b
NextHop count: 0 Neighbor ID: 0x0000
Destination: 0x899b
NextHop count: 2 Neighbor ID: 0x0101
Interface: FGE1/1/1 NextHop: Direct
Table 13 Command output
Field Descri
p
tion
Destination Nickname of the destination RB.
Interface Outgoing port.
NextHop Nickname of the next hop RB.
NextHop count Number of next hops.
Neighbor ID ID of the neighbor associated with the next hop.
graceful-restart
Use graceful-restart to enable GR for TRILL.
Use undo graceful-restart to disable GR for TRILL.

17
Syntax
graceful-restart
undo graceful-restart
Default
GR is disabled for TRILL.
Views
TRILL view
Predefined user roles
network-admin
Examples
# Enable GR for TRILL.
<Sysname> system-view
[Sysname] trill
[Sysname-trill] graceful-restart
graceful-restart interval
Use graceful-restart interval to set the GR restart interval for TRILL.
Use the undo graceful-restart interval to restore the default.
Syntax
graceful-restart interval interval
undo graceful-restart interval
Default
The GR restart interval is 300 seconds for TRILL.
Views
TRILL view
Predefined user roles
network-admin
Parameters
interval: Specifies the GR restart interval for TRILL, which is in the range of 30 to 1800 seconds.
Examples
# Configure the restart interval as 120 seconds for TRILL.
<Sysname> system-view
[Sysname] trill
[Sysname-trill] graceful-restart interval 120
log-peer-change enable
Use log-peer-change enable to enable logging of TRILL neighbor changes.