configure stpd max-hop-count
ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
ExtremeWare XOS 11.5 Command Reference Guide
1185
configure stpd max-hop-count
configure stpd <stpd_name> max-hop-count <hopcount>
Description
Specifies the maximum hop count of a BPDU until the BPDU is discarded in the specified MSTP STP
domain.
Syntax Description
Default
The default hop count of a BPDU is 20 hops.
Usage Guidelines
This command is applicable only in an MSTP environment.
If your STPD has the same name as another component, for example a VLAN, Extreme Networks
recommends that you specify the identifying keyword as well as the name. If your STPD has a name
unique only to that STPD, the keyword
stpd
is optional.
You should not configure any STP parameters unless you have considerable knowledge and experience
with STP. The default STP parameters are adequate for most networks.
The range for the
<hopcount>
parameter is 6 through 40 hops.
In an MSTP environment, the hop count has the same purpose as the maxage timer for 802.1D and
802.1w environments.
The main responsibility of the CIST is to exchange or propagate BPDUs across regions. The switch
assigns the CIST an instance ID of 0, which allows the CIST to send BPDUs for itself in addition to all of
the MSTIs within an MSTP region. Inside a region, the BPDUs contain CIST records and piggybacked
M-records. The CIST records contain information about the CIST, and the M-records contain information
about the MSTIs. Boundary ports only exchange CIST record BPDUs.
On boundary ports, only CIST record BPDUs are exchanged. In addition, if the other end is an 802.1D
or 802.1w bridge, the maxage timer is used for interoperability between the protocols.
Example
The following command sets the hop of the MSTP STPD, STPD2, to 30 hops:
configure stpd stpd2 max-hop-count 30
stpd_name
Specifies an STPD name on the switch.
hopcount
Specifies the number of hops required to age out information and notify
changes in the topology. The default is 20 hops, and the range is 6 to 40
hops.
