1-25
# Enable the loop guard function on Ethernet 1/0/2 to Ethernet 1/0/4 in system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp interface Ethernet 1/0/2 to Ethernet 1/0/4 loop-protection
stp max-hops
Syntax
stp max-hops
hops
undo stp
max-hops
View
System view
Parameters
hops
: Maximum hop count to be set. This argument ranges from 1 to 40.
Description
Use the
stp max-hops
command to set the maximum hop count for the MST region the current switch
belongs to.
Use the
undo stp max-hops
command to restore the maximum hop count to the default.
By default, the maximum hop count of an MST region is 20.
The maximum hop count configured on the region roots of an MST region limits the size of the MST
region.
A configuration BPDU contains a field that maintains the remaining hops of the configuration BPDU.
And a switch discards the configuration BPDUs whose remaining hops are 0. After a configuration
BPDU reaches a root bridge of a spanning tree in a MST region, the value of the remaining hops field in
the configuration BPDU is decreased by 1 every time the configuration BPDU passes one switch. Such
a mechanism disables the switches that are beyond the maximum hops from participating in spanning
tree calculation, and thus limits the size of an MST region.
With such a mechanism, the maximum hops configured on the switch operating as the root bridge of the
CIST or an MSTI in a MST region becomes the network diameter of the spanning tree, which limits the
size of the spanning tree in the current MST region. The switches that are not root bridges in an MST
region adopt the maximum hop settings of the root bridge.
Examples
# Set the maximum hop count of the current MST region to 35.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp max-hops 35
stp mcheck
Syntax
z
Ethernet port view:
Summary of Contents for 5500-EI PWR
Page 43: ...2 6...
Page 76: ...1 17...
Page 228: ...ii stp transmit limit 1 44 vlan mapping modulo 1 45 vlan vpn tunnel 1 46...
Page 477: ...5 24 Sysname vlan 2 Sysname vlan2 service type multicast...
Page 503: ...2 3 System View return to User View with Ctrl Z Sysname dot1x url http 192 168 19 23...
Page 519: ...iii...
Page 597: ...2 2 security policy server 192 168 0 1 user name format without domain...
Page 648: ...1 9 Examples Clear static ARP entries Sysname reset arp static...
Page 663: ...4 3 Sysname resilient arp interface vlan interface 2...
Page 767: ...1 28 From 12 00 Jan 1 2008 to 12 00 Jun 1 2008...
Page 1111: ...ii xmodem get 3 18...
Page 1314: ...A 44 Z...