Este documento descreve como usar a ferramenta incorporada de captura de pacotes, o Ethanalyzer, nos switches Nexus 3000/5000/7000.
Não existem requisitos específicos para este documento.
As informações neste documento são baseadas nos switches Nexus 3000, Nexus 5000 e Nexus 7000.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
O Ethanalyzer é uma ferramenta útil para solucionar problemas de plano de controle e tráfego destinado à CPU do switch. Mgmt é a interface para solucionar problemas de pacotes que acessam a interface mgmt0. Entrada-baixa (eth3) é para tráfego vinculado à CPU de baixa prioridade (ping, telnet, Secure Shell) e entrada-hi (eth4) é para tráfego associado à CPU de alta prioridade (Spanning Tree Protocol (STP), Bridge Protocol Data Units, FIP).
Os filtros de exibição mais usados podem ser encontrados no Wireshark
Os filtros de captura mais usados podem ser encontrados no Wireshark
Nexus# ethanalyzer local interface inbound-low detail display-filter icmp
Capturing on eth3
Frame 16 (102 bytes on wire, 102 bytes captured)
Arrival Time: Sep 7, 2011 15:42:37.081178000
[Time delta from previous captured frame: 0.642560000 seconds]
[Time delta from previous displayed frame: 1315424557.081178000 seconds]
[Time since reference or first frame: 1315424557.081178000 seconds]
Frame Number: 16
Frame Length: 102 bytes
Capture Length: 102 bytes
[Frame is marked: False]
[Protocols in frame: eth:vlan:ip:icmp:data]
Ethernet II, Src: 00:0d:ec:a3:81:bc (00:0d:ec:a3:81:bc),
Dst: 00:05:73:ce:3c:7c (00:05:73:ce:3c:7c)
Destination: 00:05:73:ce:3c:7c (00:05:73:ce:3c:7c)
Address: 00:05:73:ce:3c:7c (00:05:73:ce:3c:7c)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address(factory default)
Source: 00:0d:ec:a3:81:bc (00:0d:ec:a3:81:bc)
Address: 00:0d:ec:a3:81:bc (00:0d:ec:a3:81:bc)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
.... ..0. .... .... .... .... = LG bit: Globally unique address(factory default)
Type: 802.1Q Virtual LAN (0x8100)
802.1Q Virtual LAN
000. .... .... .... = Priority: 0
...0 .... .... .... = CFI: 0
.... 0000 0011 1001 = ID: 57 <<----------
Type: IP (0x0800)
Internet Protocol, Src: 144.1.1.63 (144.1.1.63), Dst: 144.1.1.41 (144.1.1.41)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 84
Identification: 0x1118 (4376)
<snip>
Como você pode ver, o Ethanalyzer indica que o pacote foi recebido na VLAN 57, que é a VLAN interna. No entanto, a VLAN 57 não é a VLAN real, porque 57 não está em hexadecimal. 57 em hex é 0x0039. Esse comando determina a VLAN real em hexadecimal.
Nexus# show system internal fcfwd fwcvidmap cvid | grep 0x0039
0x0039 enet 0x01 0x0090 0100.0000.080a 0100.0000.0809
0x0039 fc 0x01 0x0090 0100.0000.0007 0100.0000.0006
0x0090 é a VLAN real em hexadecimal. Você deve converter o número em decimal, que é 144. Esse cálculo ilustra que a VLAN real no quadro anterior era a VLAN 144, embora o Ethanalyzer indique que ela era 57.
Aqui está um exemplo que captura quadros FIP com o Filtro de Exibição da VLAN.(tipo==0x8914)
Nexus# ethanalyzer local interface inbound-hi display-filter vlan.etype==0x8914
Capturing on eth4
2011-10-18 13:36:47.047492 00:c0:dd:15:d4:41 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:48.313531 00:c0:dd:15:d0:95 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:49.373483 00:0d:ec:a3:81:80 -> 01:10:18:01:00:01 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:49.373868 00:0d:ec:a3:81:80 -> 01:10:18:01:00:01 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:49.374131 00:0d:ec:a3:81:80 -> 01:10:18:01:00:01 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:49.374378 00:0d:ec:a3:81:80 -> 01:10:18:01:00:01 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:49.374618 00:0d:ec:a3:81:80 -> 01:10:18:01:00:01 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:49.374859 00:0d:ec:a3:81:80 -> 01:10:18:01:00:01 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:49.375098 00:0d:ec:a3:81:80 -> 01:10:18:01:00:01 0x8914
PRI: 3 CFI: 0 ID: 56
2011-10-18 13:36:49.375338 00:0d:ec:a3:81:80 -> 01:10:18:01:00:01 0x8914
PRI: 3 CFI: 0 ID: 56
10 packets captured
Program exited with status 0.
Nexus#
Aqui está um exemplo que captura quadros FKA de um CNA específico (vFC1311 ligado ao Po1311). Essa configuração faz com que o Ethanalyzer veja o FKA do host a cada oito segundos, que é o temporizador FKA.
Nexus# show flogi database
--------------------------------------------------------------------------------
INTERFACE VSAN FCID PORT NAME NODE NAME
--------------------------------------------------------------------------------
vfc15 200 0x1e0000 50:0a:09:81:89:4b:84:32 50:0a:09:80:89:4b:84:32
vfc16 200 0x1e0003 50:0a:09:81:99:4b:84:32 50:0a:09:80:89:4b:84:32
vfc17 200 0x1e0002 21:00:00:c0:dd:12:b9:b7 20:00:00:c0:dd:12:b9:b7
vfc18 200 0x1e0006 21:00:00:c0:dd:14:6a:73 20:00:00:c0:dd:14:6a:73
vfc19 200 0x1e0001 21:00:00:c0:dd:11:00:49 20:00:00:c0:dd:11:00:49
vfc20 200 0x1e0007 21:00:00:c0:dd:12:0e:37 20:00:00:c0:dd:12:0e:37
vfc23 200 0x1e0004 10:00:00:00:c9:85:2d:e5 20:00:00:00:c9:85:2d:e5
vfc1311 200 0x1e0008 10:00:00:00:c9:9d:23:73 20:00:00:00:c9:9d:23:73
Total number of flogi = 8.
Nexus# ethanalyzer local interface inbound-hi display-filter "eth.addr==
00:00:c9:9d:23:73 && vlan.etype==0x8914 && frame.len==60"limit-captured-frames 0
Capturing on eth4
2011-10-22 11:06:11.352329 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:06:19.352116 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:06:27.351897 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:06:35.351674 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:06:43.351455 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:06:51.351238 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:06:59.351016 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:07:07.350790 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:07:15.350571 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:07:23.350345 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:07:31.350116 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:07:39.349899 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:07:47.349674 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:07:55.349481 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:08:03.349181 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:08:11.348965 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:08:19.348706 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:08:27.348451 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
2011-10-22 11:08:35.348188 00:00:c9:9d:23:73 -> 00:0d:ec:a3:81:80 0x8914
PRI: 3 CFI: 0 ID: 24
52 packets dropped
Nexus# 19 packets captured
A captura anterior exibe apenas cabeçalhos. Você também pode imprimir um pacote detalhado; mas, quando você usa a opção detail, é melhor gravar a captura em um arquivo e depois abrir o arquivo com o Wireshark.
Nexus# ethanalyzer local interface inbound-hi detail display-filter
vlan.etype==0x8914 write bootflash:flogi.pcap ?
<CR>
> Redirect it to a file
>> Redirect it to a file in append mode
display Display packets even when writing to a file
| Pipe command output to filter
Aqui está um exemplo para capturar quadros LACP:
Nexus# ethanalyzer local interface inbound-hi display-filter slow
Capturing on eth42011-12-05 12:00:08.472289 00:0d:ec:a3:81:92 -> 01:80:c2:00:00:02 LACP Link
Aggregation Control ProtocolVersion 1. Actor Port = 16651 Partner Port = 283
2011-12-05 12:00:16.944912 00:1d:a2:00:02:99 -> 01:80:c2:00:00:02 LACP Link
Aggregation Control ProtocolVersion 1. Actor Port = 283 Partner Port = 16651
2011-12-05 12:00:25.038588 00:22:55:77:e3:ad -> 01:80:c2:00:00:02 LACP Link
Aggregation Control ProtocolVersion 1. Actor Port = 16666 Partner Port = 16643
2011-12-05 12:00:25.394222 00:1b:54:c1:94:99 -> 01:80:c2:00:00:02 LACP Link
Aggregation Control ProtocolVersion 1. Actor Port = 282 Partner Port = 16644
2011-12-05 12:00:26.613525 00:0d:ec:8f:c9:ee -> 01:80:c2:00:00:02 LACP Link
Aggregation Control ProtocolVersion 1. Actor Port = 295 Partner Port = 295
2011-12-05 12:00:26.613623 00:0d:ec:8f:c9:ef -> 01:80:c2:00:00:02 LACP Link
Aggregation Control ProtocolVersion 1. Actor Port = 296 Partner Port = 296
Aqui está um exemplo para capturar todos os quadros originados com um endereço MAC de 00:26:f0 (um filtro curinga).
Nexus# ethanalyzer local interface inbound-hi display-filter
"eth.src[0:3]==00:26:f0" limit-captured-frames 0
Capturing on eth4
2012-06-20 16:37:22.721291 00:26:f0:05:00:00 -> 01:80:c2:00:00:00 STP Conf.
Root = 8192/d0:57:4c:b7:dc:00 Cost = 200 Port = 0x9004
2012-06-20 16:37:22.721340 00:26:f0:05:00:00 -> 01:00:0c:cc:cc:cd STP Conf.
Root = 8192/d0:57:4c:b7:dc:00 Cost = 200 Port = 0x9004
2012-06-20 16:37:22.721344 00:26:f0:05:00:00 -> 01:00:0c:cc:cc:cd STP Conf.
Root = 8192/d0:57:4c:b7:dc:00 Cost = 200 Port = 0x9004
2012-06-20 16:37:22.721348 00:26:f0:05:00:00 -> 01:00:0c:cc:cc:cd STP Conf.
Root = 8192/d0:57:4c:b7:dc:00 Cost = 200 Port = 0x9004
19 packets dropped
Nexus# 4 packets captured
Certifique-se de selecionar a Fila da CPU apropriada (Inbound-hi, inbound-lo ou mgmt).
Aqui estão tipos de tráfego e filas comuns:
Aqui está um exemplo de FIP e FCoE de captura:
ethanalyzer local interface inbound-hi display-filter "vlan.etype==0x8914
|| vlan.etype==0x8906"
Aqui estão alguns filtros ARP:
Nexus# ethanalyzer local interface inbound-low display-filter
arp.src.hw_mac==0013.8066.8ac2
Capturing on eth3
2012-07-12 21:23:54.643346 00:13:80:66:8a:c2 ->
ff:ff:ff:ff:ff:ff ARP Who has 172.18.121.59? Tell 172.18.121.1
NexusF340.24.10-5548-2# 1 packets captured
Nexus# ethanalyzer local interface inbound-low display-filter
arp.src.proto_ipv4==172.18.121.4
Capturing on eth3
2012-07-12 21:25:38.767772 00:05:73:ab:29:fc ->
ff:ff:ff:ff:ff:ff ARP Who has 172.18.121.1? Tell 172.18.121.4
Revisão | Data de publicação | Comentários |
---|---|---|
1.0 |
01-Jul-2013 |
Versão inicial |