Архив рубрики: mpls cw

MPLS CW load-balance drop

Февраль 7, 2019 t3mp Оставить комментарий

Схема, от PE1,11 — PE2,22 тянутся PWE для p2p поверх которого уже натянут BGP, PE2 с BD используется в качестве l2stitching-а. В определенный период начали падать BGP сессии.

                VPLS
+------+                      +------+
|      |    +---------+       |      |
| PE1  +----+         +-------+  PE2 |   +------+
|      |    |         |      ++      +---+      |
+------+    |         |       +------+   |      |
            |   PE2   |                  | CE1  |
+------+    |         |       +------+   |      |
|      |    |         +-------+      +---+      |
| PE11 +----+         |       | PE22 |   +------+
|      |    +---------+       |      |
+------+                      +------+
                MPLS LDP/LU
                 InterAS

VPLS

+------+ +------+

| | +---------+ | |

| PE1 +----+ +-------+ PE2 | +------+

| | | | ++ +---+ |

+------+ | | +------+ | |

| PE2 | | CE1 |

+------+ | | +------+ | |

| | | +-------+ +---+ |

| PE11 +----+ | | PE22 | +------+

| | +---------+ | |

+------+ +------+

MPLS LDP/LU

InterAS

PE1# ping vrf VRF1 192.168.100.195 source 192.168.100.194 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 192.168.100.195, timeout is 2 seconds:
Packet sent with a source address of 192.168.100.194 
!...!...!!!!!!!......!!!!!!!!!...!.!..
Success rate is 52 percent (20/38), round-trip min/avg/max = 16/16/17 ms

PE1# ping vrf VRF1 192.168.100.195 source 192.168.100.194 repeat 100

Type escape sequence to abort.

Sending 100, 100-byte ICMP Echos to 192.168.100.195, timeout is 2 seconds:

Packet sent with a source address of 192.168.100.194

!...!...!!!!!!!......!!!!!!!!!...!.!..

Success rate is 52 percent (20/38), round-trip min/avg/max = 16/16/17 ms

Проблем до Lo (PE2, PE22) нет никаких, потери c (PE1,PE11) сразу до 2х коробок (PE2, PE22), смотрим MACки:

RP/0/RSP0/CPU0:PE2# sh l2vpn forwarding bridge-domain GGSN:APN1 mac-address location 0/0/CPU0
 To Resynchronize MAC table from the Network Processors, use the command...
    l2vpn resynchronize forwarding mac-address-table location <r/s/i>

Mac Address    Type    Learned from/Filtered on    LC learned Resync Age         Mapped to
------------------------------------------------------------------------------------------
f4ea.67b3.1ea2 dynamic (172.16.1.2, 1111)          0/0/CPU0   0d 0h 0m 12s       N/A
f4ea.67b3.1ec0 dynamic (172.16.1.2, 1111)          0/0/CPU0   0d 0h 0m 0s        N/A
4055.39e2.3225 dynamic (172.31.200.188, 1111)      0/0/CPU0   0d 0h 0m 10s       N/A
649e.f39f.e5c0 dynamic (172.16.9.11, 2222)         0/0/CPU0   0d 0h 0m 1s        N/A
c464.1323.69c0 dynamic (172.16.9.120, 2222)        0/0/CPU0   0d 0h 0m 8s        N/A

RP/0/RSP0/CPU0:PE2# sh l2vpn forwarding bridge-domain GGSN:APN1 mac-address location 0/0/CPU0

To Resynchronize MAC table from the Network Processors, use the command...

l2vpn resynchronize forwarding mac-address-table location <r/s/i>

Mac Address Type Learned from/Filtered on LC learned Resync Age Mapped to

------------------------------------------------------------------------------------------

f4ea.67b3.1ea2 dynamic (172.16.1.2, 1111) 0/0/CPU0 0d 0h 0m 12s N/A

f4ea.67b3.1ec0 dynamic (172.16.1.2, 1111) 0/0/CPU0 0d 0h 0m 0s N/A

4055.39e2.3225 dynamic (172.31.200.188, 1111) 0/0/CPU0 0d 0h 0m 10s N/A

649e.f39f.e5c0 dynamic (172.16.9.11, 2222) 0/0/CPU0 0d 0h 0m 1s N/A

c464.1323.69c0 dynamic (172.16.9.120, 2222) 0/0/CPU0 0d 0h 0m 8s N/A

PE в удаленный регион (172.16.9.11, 172.16.9.120):

RP/0/RSP0/CPU0:PE2# sh l2vpn bridge group GGSN bd-name APN1 detail | b 172.16.9.11
    PW: neighbor 172.16.9.11, PW ID 2222, state is up ( established )
      PW class not set, XC ID 0xc000004e
      Encapsulation MPLS, protocol LDP
      Source address 172.16.30.0
      PW type Ethernet, control word disabled, interworking none
      PW backup disable delay 0 sec
      Sequencing not set

      PW Status TLV in use
        MPLS         Local                          Remote
        ------------ ------------------------------ ---------------------------
        Label        24082                          34063
        Group ID     0xe                            0x0
        Interface    Access PW                      unknown
        MTU          1600                           1600
        Control word disabled                       disabled
        PW type      Ethernet                       Ethernet
        VCCV CV type 0x2                            0xa
                     (LSP ping verification)        (LSP ping verification)
                                                    (BFD PW FD/AC status)
        VCCV CC type 0x6                            0x6
                     (router alert label)           (router alert label)
                     (TTL expiry)                   (TTL expiry)
        ------------ ------------------------------ ---------------------------
      Incoming Status (PW Status TLV):
        Status code: 0x0 (Up) in Notification message
      MIB cpwVcIndex: 3221225550
      Create time: 07/02/2019 09:30:19 (02:33:15 ago)
      Last time status changed: 07/02/2019 11:53:34 (00:10:00 ago)
      Last time PW went down: 07/02/2019 11:52:35 (00:10:58 ago)
      MAC withdraw messages: sent 0, received 0
      Static MAC addresses:
      Statistics:
        packets: received 1978 (unicast 1883), sent 2545
        bytes: received 198920 (unicast 192626), sent 245766 
        MAC move: 0
      Storm control drop counters:
        packets: broadcast 0, multicast 0, unknown unicast 0
        bytes: broadcast 0, multicast 0, unknown unicast 0
      MAC learning: enabled
      Flooding:
        Broadcast & Multicast: enabled
        Unknown unicast: enabled
      MAC aging time: 300 s, Type: inactivity
      MAC limit: 4000, Action: none, Notification: syslog
      MAC limit reached: no
      MAC port down flush: enabled
      MAC Secure: disabled, Logging: disabled
      Split Horizon Group: none
      DHCPv4 Snooping: disabled
      DHCPv4 Snooping profile: none
      IGMP Snooping: disabled
      IGMP Snooping profile: none
      MLD Snooping profile: none
      Storm Control: bridge-domain policer
      MAC limit: 4000, Action: none, Notification: syslog

RP/0/RSP0/CPU0:PE2# sh l2vpn bridge group GGSN bd-name APN1 detail | b 172.16.9.11

PW: neighbor 172.16.9.11, PW ID 2222, state is up ( established )

PW class not set, XC ID 0xc000004e

Encapsulation MPLS, protocol LDP

Source address 172.16.30.0

PW type Ethernet, control word disabled, interworking none

PW backup disable delay 0 sec

Sequencing not set

PW Status TLV in use

MPLS Local Remote

------------ ------------------------------ ---------------------------

Label 24082 34063

Group ID 0xe 0x0

Interface Access PW unknown

MTU 1600 1600

Control word disabled disabled

PW type Ethernet Ethernet

VCCV CV type 0x2 0xa

(LSP ping verification) (LSP ping verification)

(BFD PW FD/AC status)

VCCV CC type 0x6 0x6

(router alert label) (router alert label)

(TTL expiry) (TTL expiry)

------------ ------------------------------ ---------------------------

Incoming Status (PW Status TLV):

Status code: 0x0 (Up) in Notification message

MIB cpwVcIndex: 3221225550

Create time: 07/02/2019 09:30:19 (02:33:15 ago)

Last time status changed: 07/02/2019 11:53:34 (00:10:00 ago)

Last time PW went down: 07/02/2019 11:52:35 (00:10:58 ago)

MAC withdraw messages: sent 0, received 0

Static MAC addresses:

Statistics:

packets: received 1978 (unicast 1883), sent 2545

bytes: received 198920 (unicast 192626), sent 245766

MAC move: 0

Storm control drop counters:

packets: broadcast 0, multicast 0, unknown unicast 0

bytes: broadcast 0, multicast 0, unknown unicast 0

MAC learning: enabled

Flooding:

Broadcast & Multicast: enabled

Unknown unicast: enabled

MAC aging time: 300 s, Type: inactivity

MAC limit: 4000, Action: none, Notification: syslog

MAC limit reached: no

MAC port down flush: enabled

MAC Secure: disabled, Logging: disabled

Split Horizon Group: none

DHCPv4 Snooping: disabled

DHCPv4 Snooping profile: none

IGMP Snooping: disabled

IGMP Snooping profile: none

MLD Snooping profile: none

Storm Control: bridge-domain policer

MAC limit: 4000, Action: none, Notification: syslog

Вспоминаем проблему при балансировке когда P,PE пытается посмотреть в MPLS Payload и угадать следующий заголовок для расчета хэша балансировки, в l2vpn MAC-и начинающиеся с 4,6 могут ошибочно быть принятыми за IPv4, IPv6 пакеты как WA перед MPLS Payload добавляем заголовок CW [0000] на обоих PE:

RP/0/RSP0/CPU0:PE2# sh configuration commit changes last 1
!! IOS XR Configuration
l2vpn
 pw-class PWC_ETHER_CW
  encapsulation mpls
   control-word
   transport-mode ethernet
  !
 !
 bridge group GGSN
  bridge-domain APN1
   neighbor 172.31.200.188 pw-id 1111
    pw-class PWC_ETHER_CW
   !
   neighbor 172.16.1.2 pw-id 1111
    pw-class PWC_ETHER_CW
   !
   neighbor 172.16.9.11 pw-id 2222
    pw-class PWC_ETHER_CW
   !
   neighbor 172.16.9.120 pw-id 2222
    pw-class PWC_ETHER_CW
   !
  !
 !
!

RP/0/RSP0/CPU0:PE2# sh configuration commit changes last 1

!! IOS XR Configuration

l2vpn

pw-class PWC_ETHER_CW

encapsulation mpls

control-word

transport-mode ethernet

bridge group GGSN

bridge-domain APN1

neighbor 172.31.200.188 pw-id 1111

pw-class PWC_ETHER_CW

neighbor 172.16.1.2 pw-id 1111

pw-class PWC_ETHER_CW

neighbor 172.16.9.11 pw-id 2222

pw-class PWC_ETHER_CW

neighbor 172.16.9.120 pw-id 2222

pw-class PWC_ETHER_CW

Проверяем:

RP/0/RSP0/CPU0:PE2# sh l2vpn bridge group GGSN bd-name APN1 detail | b 172.16.9.120
    PW: neighbor 172.16.9.120, PW ID 2222, state is up ( established )
      PW class PWC_ETHER_CW, XC ID 0xc000004f
      Encapsulation MPLS, protocol LDP
      Source address 172.16.30.0
      PW type Ethernet, control word enabled, interworking none
      PW backup disable delay 0 sec
      Sequencing not set

      PW Status TLV in use
        MPLS         Local                          Remote
        ------------ ------------------------------ ---------------------------
        Label        24083                          35834
        Group ID     0xe                            0x0
        Interface    Access PW                      unknown
        MTU          1600                           1600
        Control word enabled                        enabled
        PW type      Ethernet                       Ethernet
        VCCV CV type 0x2                            0xa
                     (LSP ping verification)        (LSP ping verification)
                                                    (BFD PW FD/AC status)
        VCCV CC type 0x7                            0x7
                     (control word)                 (control word)
                     (router alert label)           (router alert label)
                     (TTL expiry)                   (TTL expiry)
        ------------ ------------------------------ ---------------------------
      Incoming Status (PW Status TLV):
        Status code: 0x0 (Up) in Notification message
      MIB cpwVcIndex: 3221225551
      Create time: 07/02/2019 11:51:51 (00:13:58 ago)
      Last time status changed: 07/02/2019 12:01:39 (00:04:10 ago)
      Last time PW went down: 07/02/2019 12:00:55 (00:04:55 ago)
      MAC withdraw messages: sent 0, received 0
      Static MAC addresses:
      Statistics:
        packets: received 5689 (unicast 5682), sent 5894
        bytes: received 646775 (unicast 646247), sent 662143
        MAC move: 0
      Storm control drop counters:
        packets: broadcast 0, multicast 0, unknown unicast 0
        bytes: broadcast 0, multicast 0, unknown unicast 0
      MAC learning: enabled
      Flooding:
        Broadcast & Multicast: enabled
        Unknown unicast: enabled
      MAC aging time: 300 s, Type: inactivity
      MAC limit: 4000, Action: none, Notification: syslog

RP/0/RSP0/CPU0:PE2# sh l2vpn bridge group GGSN bd-name APN1 detail | b 172.16.9.120

PW: neighbor 172.16.9.120, PW ID 2222, state is up ( established )

PW class PWC_ETHER_CW, XC ID 0xc000004f

Encapsulation MPLS, protocol LDP

Source address 172.16.30.0

PW type Ethernet, control word enabled, interworking none

PW backup disable delay 0 sec

Sequencing not set

PW Status TLV in use

MPLS Local Remote

------------ ------------------------------ ---------------------------

Label 24083 35834

Group ID 0xe 0x0

Interface Access PW unknown

MTU 1600 1600

Control word enabled enabled

PW type Ethernet Ethernet

VCCV CV type 0x2 0xa

(LSP ping verification) (LSP ping verification)

(BFD PW FD/AC status)

VCCV CC type 0x7 0x7

(control word) (control word)

(router alert label) (router alert label)

(TTL expiry) (TTL expiry)

------------ ------------------------------ ---------------------------

Incoming Status (PW Status TLV):

Status code: 0x0 (Up) in Notification message

MIB cpwVcIndex: 3221225551

Create time: 07/02/2019 11:51:51 (00:13:58 ago)

Last time status changed: 07/02/2019 12:01:39 (00:04:10 ago)

Last time PW went down: 07/02/2019 12:00:55 (00:04:55 ago)

MAC withdraw messages: sent 0, received 0

Static MAC addresses:

Statistics:

packets: received 5689 (unicast 5682), sent 5894

bytes: received 646775 (unicast 646247), sent 662143

MAC move: 0

Storm control drop counters:

packets: broadcast 0, multicast 0, unknown unicast 0

bytes: broadcast 0, multicast 0, unknown unicast 0

MAC learning: enabled

Flooding:

Broadcast & Multicast: enabled

Unknown unicast: enabled

MAC aging time: 300 s, Type: inactivity

MAC limit: 4000, Action: none, Notification: syslog

После все ок:

PE1# ping vrf VRF1 192.168.100.195 source 192.168.100.194 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 192.168.100.195, timeout is 2 seconds:
Packet sent with a source address of 192.168.100.194 
!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 16/17/44 ms

PE1# ping vrf VRF1 192.168.100.195 source 192.168.100.194 repeat 100

Type escape sequence to abort.

Sending 100, 100-byte ICMP Echos to 192.168.100.195, timeout is 2 seconds:

Packet sent with a source address of 192.168.100.194

!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (100/100), round-trip min/avg/max = 16/17/44 ms

l2vpn, mpls, mpls cw, mpls pw

Wireshark, парсинг MPLS Ethernet PW + CW

Февраль 19, 2017 t3mp Оставить комментарий

Смотрим кадр EthPW + CW на транзите:
ARP Request:

# tshark -Vr R1.pcapng -xO "eth"
Frame 1: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface 0
Ethernet II, Src: LucentTe_71:f7:01 (00:05:86:71:f7:01), Dst: LucentTe_71:7d:00 (00:05:86:71:7d:00)
    Destination: LucentTe_71:7d:00 (00:05:86:71:7d:00)
        Address: LucentTe_71:7d:00 (00:05:86:71:7d:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: LucentTe_71:f7:01 (00:05:86:71:f7:01)
        Address: LucentTe_71:f7:01 (00:05:86:71:f7:01)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: MPLS label switched packet (0x8847)
MultiProtocol Label Switching Header, Label: 299776, Exp: 0, S: 0, TTL: 255
MultiProtocol Label Switching Header, Label: 299776, Exp: 0, S: 1, TTL: 255
PW Ethernet Control Word
Ethernet II, Src: 50:00:00:04:00:00 (50:00:00:04:00:00), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: 50:00:00:04:00:00 (50:00:00:04:00:00)
        Address: 50:00:00:04:00:00 (50:00:00:04:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: ARP (0x0806)
Address Resolution Protocol (request)

0000  00 05 86 71 7d 00 00 05 86 71 f7 01 88 47 49 30   ...q}....q...GI0
0010  00 ff 49 30 01 ff 00 00 00 00 ff ff ff ff ff ff   ..I0............
0020  50 00 00 04 00 00 08 06 00 01 08 00 06 04 00 01   P...............
0030  50 00 00 04 00 00 c0 a8 00 01 00 00 00 00 00 00   P...............
0040  c0 a8 00 02                                       ....

# tshark -Vr R1.pcapng -xO "eth"

Frame 1: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface 0

Ethernet II, Src: LucentTe_71:f7:01 (00:05:86:71:f7:01), Dst: LucentTe_71:7d:00 (00:05:86:71:7d:00)

Destination: LucentTe_71:7d:00 (00:05:86:71:7d:00)

Address: LucentTe_71:7d:00 (00:05:86:71:7d:00)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Source: LucentTe_71:f7:01 (00:05:86:71:f7:01)

Address: LucentTe_71:f7:01 (00:05:86:71:f7:01)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Type: MPLS label switched packet (0x8847)

MultiProtocol Label Switching Header, Label: 299776, Exp: 0, S: 0, TTL: 255

MultiProtocol Label Switching Header, Label: 299776, Exp: 0, S: 1, TTL: 255

PW Ethernet Control Word

Ethernet II, Src: 50:00:00:04:00:00 (50:00:00:04:00:00), Dst: Broadcast (ff:ff:ff:ff:ff:ff)

Destination: Broadcast (ff:ff:ff:ff:ff:ff)

Address: Broadcast (ff:ff:ff:ff:ff:ff)

.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)

.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)

Source: 50:00:00:04:00:00 (50:00:00:04:00:00)

Address: 50:00:00:04:00:00 (50:00:00:04:00:00)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Type: ARP (0x0806)

Address Resolution Protocol (request)

0000 00 05 86 71 7d 00 00 05 86 71 f7 01 88 47 49 30 ...q}....q...GI0

0010 00 ff 49 30 01 ff 00 00 00 00 ff ff ff ff ff ff ..I0............

0020 50 00 00 04 00 00 08 06 00 01 08 00 06 04 00 01 P...............

0030 50 00 00 04 00 00 c0 a8 00 01 00 00 00 00 00 00 P...............

0040 c0 a8 00 02 ....

ARP Reply:

Frame 2: 64 bytes on wire (512 bits), 64 bytes captured (512 bits) on interface 0
Ethernet II, Src: LucentTe_71:7d:00 (00:05:86:71:7d:00), Dst: LucentTe_71:f7:01 (00:05:86:71:f7:01)
    Destination: LucentTe_71:f7:01 (00:05:86:71:f7:01)
        Address: LucentTe_71:f7:01 (00:05:86:71:f7:01)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: LucentTe_71:7d:00 (00:05:86:71:7d:00)
        Address: LucentTe_71:7d:00 (00:05:86:71:7d:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: MPLS label switched packet (0x8847)
MultiProtocol Label Switching Header, Label: 299776, Exp: 0, S: 1, TTL: 254
IEEE 802.3 Ethernet
    Destination: 00:00:00_00:50:00 (00:00:00:00:50:00)
        Address: 00:00:00_00:50:00 (00:00:00:00:50:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: LexmarkI_00:50:00 (00:04:00:00:50:00)
        Address: LexmarkI_00:50:00 (00:04:00:00:50:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Length: 5
    Padding: 01080006040002500000050000c0a80002500000040000
    Trailer: c0a80001
Logical-Link Control
Data (1 byte)

0000  00 05 86 71 f7 01 00 05 86 71 7d 00 88 47 49 30   ...q.....q}..GI0
0010  01 fe 00 00 00 00 50 00 00 04 00 00 50 00 00 05   ......P.....P...
0020  00 00 08 06 00 01 08 00 06 04 00 02 50 00 00 05   ............P...
0030  00 00 c0 a8 00 02 50 00 00 04 00 00 c0 a8 00 01   ......P.........

Frame 2: 64 bytes on wire (512 bits), 64 bytes captured (512 bits) on interface 0

Ethernet II, Src: LucentTe_71:7d:00 (00:05:86:71:7d:00), Dst: LucentTe_71:f7:01 (00:05:86:71:f7:01)

Destination: LucentTe_71:f7:01 (00:05:86:71:f7:01)

Address: LucentTe_71:f7:01 (00:05:86:71:f7:01)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Source: LucentTe_71:7d:00 (00:05:86:71:7d:00)

Address: LucentTe_71:7d:00 (00:05:86:71:7d:00)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Type: MPLS label switched packet (0x8847)

MultiProtocol Label Switching Header, Label: 299776, Exp: 0, S: 1, TTL: 254

IEEE 802.3 Ethernet

Destination: 00:00:00_00:50:00 (00:00:00:00:50:00)

Address: 00:00:00_00:50:00 (00:00:00:00:50:00)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Source: LexmarkI_00:50:00 (00:04:00:00:50:00)

Address: LexmarkI_00:50:00 (00:04:00:00:50:00)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Length: 5

Padding: 01080006040002500000050000c0a80002500000040000

Trailer: c0a80001

Logical-Link Control

Data (1 byte)

0000 00 05 86 71 f7 01 00 05 86 71 7d 00 88 47 49 30 ...q.....q}..GI0

0010 01 fe 00 00 00 00 50 00 00 04 00 00 50 00 00 05 ......P.....P...

0020 00 00 08 06 00 01 08 00 06 04 00 02 50 00 00 05 ............P...

0030 00 00 c0 a8 00 02 50 00 00 04 00 00 c0 a8 00 01 ......P.........

Откуда-то появляется IEEE 802.3 LLC, хотя его конечно нет, это связанно с ошибочной интерпретацией снифера данных идущих после MPLS заголовка. EthType может быть 0x8847 или 0x8848, MPLS unicast/multicast соответственно. Тем самым нам приходиться угадывать что лежит ниже MPLS заголовка. В данном случае снифер не видит наличие поля CW и сразу интерпретирует данные как неверный MAC адрес, имеем:
00 00 00 00 50 00 — Ethernet dst
00 04 00 00 50 00 — Ethernet src
00 05 — длинна данных
00 00 08 06 — LLC заголовок
Т.к мы знаем наверняка, что у нас используется PW + CW, укажем это в явном виде опцией -d («decode as») и получаем читаемый вид:

# tshark -Vr R1.pcapng -xO "eth" -d mpls.label==299776,pwethcw
Frame 2: 64 bytes on wire (512 bits), 64 bytes captured (512 bits) on interface 0
Ethernet II, Src: LucentTe_71:7d:00 (00:05:86:71:7d:00), Dst: LucentTe_71:f7:01 (00:05:86:71:f7:01)
    Destination: LucentTe_71:f7:01 (00:05:86:71:f7:01)
        Address: LucentTe_71:f7:01 (00:05:86:71:f7:01)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: LucentTe_71:7d:00 (00:05:86:71:7d:00)
        Address: LucentTe_71:7d:00 (00:05:86:71:7d:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: MPLS label switched packet (0x8847)
MultiProtocol Label Switching Header, Label: 299776, Exp: 0, S: 1, TTL: 254
PW Ethernet Control Word
Ethernet II, Src: 50:00:00:05:00:00 (50:00:00:05:00:00), Dst: 50:00:00:04:00:00 (50:00:00:04:00:00)
    Destination: 50:00:00:04:00:00 (50:00:00:04:00:00)
        Address: 50:00:00:04:00:00 (50:00:00:04:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: 50:00:00:05:00:00 (50:00:00:05:00:00)
        Address: 50:00:00:05:00:00 (50:00:00:05:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: ARP (0x0806)
Address Resolution Protocol (reply)

0000  00 05 86 71 f7 01 00 05 86 71 7d 00 88 47 49 30   ...q.....q}..GI0
0010  01 fe 00 00 00 00 50 00 00 04 00 00 50 00 00 05   ......P.....P...
0020  00 00 08 06 00 01 08 00 06 04 00 02 50 00 00 05   ............P...
0030  00 00 c0 a8 00 02 50 00 00 04 00 00 c0 a8 00 01   ......P.........

# tshark -Vr R1.pcapng -xO "eth" -d mpls.label==299776,pwethcw

Frame 2: 64 bytes on wire (512 bits), 64 bytes captured (512 bits) on interface 0

Ethernet II, Src: LucentTe_71:7d:00 (00:05:86:71:7d:00), Dst: LucentTe_71:f7:01 (00:05:86:71:f7:01)

Destination: LucentTe_71:f7:01 (00:05:86:71:f7:01)

Address: LucentTe_71:f7:01 (00:05:86:71:f7:01)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Source: LucentTe_71:7d:00 (00:05:86:71:7d:00)

Address: LucentTe_71:7d:00 (00:05:86:71:7d:00)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Type: MPLS label switched packet (0x8847)

MultiProtocol Label Switching Header, Label: 299776, Exp: 0, S: 1, TTL: 254

PW Ethernet Control Word

Ethernet II, Src: 50:00:00:05:00:00 (50:00:00:05:00:00), Dst: 50:00:00:04:00:00 (50:00:00:04:00:00)

Destination: 50:00:00:04:00:00 (50:00:00:04:00:00)

Address: 50:00:00:04:00:00 (50:00:00:04:00:00)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Source: 50:00:00:05:00:00 (50:00:00:05:00:00)

Address: 50:00:00:05:00:00 (50:00:00:05:00:00)

.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)

.... ...0 .... .... .... .... = IG bit: Individual address (unicast)

Type: ARP (0x0806)

Address Resolution Protocol (reply)

0000 00 05 86 71 f7 01 00 05 86 71 7d 00 88 47 49 30 ...q.....q}..GI0

0010 01 fe 00 00 00 00 50 00 00 04 00 00 50 00 00 05 ......P.....P...

0020 00 00 08 06 00 01 08 00 06 04 00 02 50 00 00 05 ............P...

0030 00 00 c0 a8 00 02 50 00 00 04 00 00 c0 a8 00 01 ......P.........

Полный список протоколов можно получить:

# tshark -d .
mpls_y1711 (MPLS ITU-T Y.1711 OAM)
mplspwatm11_or_aal5pdu (MPLS PW ATM One-to-One or AAL5 PDU encapsulation)
mplspwatmaal5sdu (MPLS PW ATM AAL5 CPCS-SDU mode encapsulation)
mplspwatmn1cw (MPLS PW ATM N-to-One encapsulation, with CW)
mplspwatmn1nocw (MPLS PW ATM N-to-One encapsulation, no CW)
pw_hdlc_nocw_fr (HDLC PW, FR port mode (no CW))
pw_hdlc_nocw_hdlc_ppp (HDLC-like framing for PPP)
pwcesopsn (CESoPSN basic NxDS0 mode (no RTP support))
pwethcw (PW Ethernet Control Word)
pwethheuristic (Ethernet PW (CW heuristic))
pwethnocw (Ethernet PW (no CW))
pwfr (PW Frame Relay DLCI Control Word)
pwmcw (PW MPLS Control Word (generic/preferred))
<output omitted>

# tshark -d .

mpls_y1711 (MPLS ITU-T Y.1711 OAM)

mplspwatm11_or_aal5pdu (MPLS PW ATM One-to-One or AAL5 PDU encapsulation)

mplspwatmaal5sdu (MPLS PW ATM AAL5 CPCS-SDU mode encapsulation)

mplspwatmn1cw (MPLS PW ATM N-to-One encapsulation, with CW)

mplspwatmn1nocw (MPLS PW ATM N-to-One encapsulation, no CW)

pw_hdlc_nocw_fr (HDLC PW, FR port mode (no CW))

pw_hdlc_nocw_hdlc_ppp (HDLC-like framing for PPP)

pwcesopsn (CESoPSN basic NxDS0 mode (no RTP support))

pwethcw (PW Ethernet Control Word)

pwethheuristic (Ethernet PW (CW heuristic))

pwethnocw (Ethernet PW (no CW))

pwfr (PW Frame Relay DLCI Control Word)

pwmcw (PW MPLS Control Word (generic/preferred))

В Wireshark это делается: Правый клик на кадр, «Decode As», поле «Current» выставляем как: «Ethernet PW (with CW)».

IPv5

Архив рубрики: mpls cw

MPLS CW load-balance drop

Wireshark, парсинг MPLS Ethernet PW + CW

Networking