■L2モデルのCatalystでL2の基本動作を確認する Cisco 1812JでL2の基本動作の確認する http://labunix.hateblo.jp/entry/20140503/1399046426 S1>show version | include cisco cisco WS-C2970G-24T-E (PowerPC405) processor (revision L0) with 118784K/12280K bytes of memory. ■どのCatalystシリーズがL2かL3かを調べたいなら、 以下の画像が凄くシンプルでわかりやすい。 Cisco Systems社製 スイッチ Catalystシリーズ http://fenics.fujitsu.com/products/cisco_sh/ ■環境は前回同様。 $ tree 172* 172.16.0.0.0-172.31.255.255_255.240.0.0 ├── 172.16.16.200 │ ├── 172.16.16.200 │ ├── 172.16.16.201 │ └── 172.16.16.202 └── 172.31.31.201 ├── 172.31.31.200 ├── 172.31.31.201 └── 172.31.31.202 ■vifにIP設定 「ip routing」が使えないのがL2。 S1>enable Password: S1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. S1(config)#no ip routing ^ % Invalid input detected at '^' marker. S1(config)#interface vlan 1 S1(config-if)#ip address 172.31.31.200 255.255.255.0 S1(config-if)#no shutdown S1(config-if)#end S1#show ip interface brief | include up.*up GigabitEthernet0/13 unassigned YES unset up up GigabitEthernet0/14 unassigned YES unset up up ■L2である代わりに、1Gbpsで24ポート。VLAN系のコマンドが使いやすい。 アクセス層の役割としては十分。 S1#show vlan brief | exclude 100[2-5] VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Gi0/1, Gi0/2, Gi0/3, Gi0/4 Gi0/5, Gi0/6, Gi0/7, Gi0/8 Gi0/9, Gi0/10, Gi0/11, Gi0/12 Gi0/13, Gi0/14, Gi0/15, Gi0/16 Gi0/17, Gi0/18, Gi0/19, Gi0/20 Gi0/21, Gi0/22, Gi0/23, Gi0/24 S1#show vtp status VTP Version : 2 Configuration Revision : 0 Maximum VLANs supported locally : 1005 Number of existing VLANs : 5 VTP Operating Mode : Transparent VTP Domain Name : VTP Pruning Mode : Disabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0x57 0xCD 0x40 0x65 0x63 0x59 0x47 0xBD Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00 ■ping check from debian $ for n in `seq 200 202`;do \ env LANG=C /sbin/ifconfig | grep 172.31.31.${n} || \ traceroute -n 172.31.31.${n} | grep ms; \ done 1 172.31.31.200 0.380 ms * * 1 172.31.31.201 0.135 ms 0.106 ms 0.081 ms inet addr:172.31.31.202 Bcast:172.31.31.255 Mask:255.255.255.0 $ for n in `seq 200 202`;do \ env LANG=C /sbin/ifconfig | grep 172.31.31.${n} || \ traceroute -n 172.31.31.${n} | grep ms; \ done 6 * 172.31.31.200 0.391 ms * inet addr:172.31.31.201 Bcast:172.31.31.255 Mask:255.255.255.0 1 172.31.31.202 0.185 ms 0.186 ms 0.167 ms S1#show ip arp Protocol Address Age (min) Hardware Addr Type Interface Internet 172.31.31.200 - 00xx.xxxx.xxxx ARPA Vlan1 Internet 172.31.31.201 1 00yy.yyyy.yyyy ARPA Vlan1 Internet 172.31.31.202 1 00zz.zzzz.zzzz ARPA Vlan1 Internet 172.16.16.201 3 00ww.wwww.wwww ARPA Vlan1 ■デフォルトGWを設定 ルーティング確認用の「show ip route」が使えないので、コンフィグから直接確認。 S1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. S1(config)#ip default-gateway 172.31.31.201 S1(config)#end S1#show running-config | include default ip default-gateway 172.31.31.201 S1#show interfaces vlan1 | include Internet Internet address is 172.31.31.200/24 ■ルーティングチェック from debian $ env LANG=C /sbin/ifconfig eth1 | grep "inet " inet addr:172.16.16.200 Bcast:172.16.16.255 Mask:255.255.255.0 $ traceroute -n 172.31.31.200 traceroute to 172.31.31.200 (172.31.31.200), 30 hops max, 60 byte packets 1 172.16.16.201 0.336 ms 0.260 ms 0.224 ms 2 172.31.31.200 0.585 ms * * ■ルーティングチェック from WS-C2970G S1#traceroute 172.16.16.200 Type escape sequence to abort. Tracing the route to 172.16.16.200 1 172.31.31.201 0 msec 0 msec 0 msec 2 172.16.16.200 0 msec 0 msec 0 msec S1# ■VLANコマンドはパッと見るだけでも、ルータモデルよりCatalystの方が便利そう。
