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Re: 問題17865のポートプライオリティについて

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疑問は「Fa0/21であれば, Prio.Nbr は128.21に, Fa0/24であれば128.24になっているべきでは」と思った次第です。
ぶっちゃけいうとIOSが勝手に割り振ってるので「なっているべき」と言われても「そう言われましてもねぇ…」としか言いようがないです。解説の図も実機を使っているのだと思いますが、機種がなんだかわからないので何が正しいのか、と言われても「Ping-tさんが使った機器ではこのように出力されている」としか読み取りようがないですよね？

とりあえず、私の手元にある環境（Catalyst 3560v2）では、Nbrは広帯域なGigabitEthernet0/1から順に振られているみたいです。
show interface statusの出力順とも関係ないっぽい、としかわかんないです。
Switch#show spanning-tree detail | include Port
 Port 1 (GigabitEthernet0/1) of VLAN0001 is designated forwarding
   Port path cost 4, Port priority 128, Port Identifier 128.1.
 Port 2 (GigabitEthernet0/2) of VLAN0001 is designated forwarding
   Port path cost 4, Port priority 128, Port Identifier 128.2.
 Port 3 (FastEthernet0/1) of VLAN0001 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.3.
 Port 9 (FastEthernet0/7) of VLAN0001 is root forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.9.
 Port 10 (FastEthernet0/8) of VLAN0001 is alternate blocking
   Port path cost 19, Port priority 128, Port Identifier 128.10.
 Port 11 (FastEthernet0/9) of VLAN0001 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.11.
 Port 12 (FastEthernet0/10) of VLAN0001 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.12.
 Port 13 (FastEthernet0/11) of VLAN0001 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.13.
 Port 14 (FastEthernet0/12) of VLAN0001 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.14.
 Port 9 (FastEthernet0/7) of VLAN0010 is root forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.9.
 Port 10 (FastEthernet0/8) of VLAN0010 is alternate blocking
   Port path cost 19, Port priority 128, Port Identifier 128.10.
 Port 11 (FastEthernet0/9) of VLAN0010 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.11.
 Port 12 (FastEthernet0/10) of VLAN0010 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.12.
 Port 9 (FastEthernet0/7) of VLAN0020 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.9.
 Port 10 (FastEthernet0/8) of VLAN0020 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.10.
 Port 11 (FastEthernet0/9) of VLAN0020 is root forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.11.
 Port 12 (FastEthernet0/10) of VLAN0020 is alternate blocking
   Port path cost 19, Port priority 128, Port Identifier 128.12.
 Port 9 (FastEthernet0/7) of VLAN0099 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.9.
 Port 10 (FastEthernet0/8) of VLAN0099 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.10.
 Port 11 (FastEthernet0/9) of VLAN0099 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.11.
 Port 12 (FastEthernet0/10) of VLAN0099 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.12.
 Port 9 (FastEthernet0/7) of VLAN0200 is root forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.9.
 Port 10 (FastEthernet0/8) of VLAN0200 is alternate blocking
   Port path cost 19, Port priority 128, Port Identifier 128.10.
 Port 11 (FastEthernet0/9) of VLAN0200 is alternate blocking
   Port path cost 19, Port priority 128, Port Identifier 128.11.
 Port 12 (FastEthernet0/10) of VLAN0200 is alternate blocking
   Port path cost 19, Port priority 128, Port Identifier 128.12.
※他のスイットとトランク接続してたりするので出力が変に思えるかもしれませんが、今回の話題と関係ないところなので気にしないでください。

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