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Один из наших читателей (пожелавший остаться анонимом) прислал нам по мылу конфигурацию для схемы с Juniper MX80, в которой прокидывается vlan через trunk проходящий через 80тые Juniper`ы.
Спасибо ему за инфу, т.к. она точно будет полезна всем кто столкнется с подобной задачей.

Топология

MX80-client [ge-1/0/2] <—> [ge-1/0/4] MX80-1 [ge-1/0/1] <—> [ge-1/0/7] MX80-2 [ge-1/1/1] <—> [ge-2/0/0] M120-client

Описание топологии

Access port   <—>    (Trunk port back to back)  <—>    Access port

IP-адрес на MX80-client (слева) — 200.200.200.1/30
IP-адрес на M120-client  (справа) — 200.200.200.2/30

Конфиги

MX80-1

root@MX80-1# show interfaces ge-1/0/1

flexible-vlan-tagging;
native-vlan-id 100;
encapsulation flexible-ethernet-services;
unit 2 {
    encapsulation vlan-bridge;
    vlan-id 10;
}

root@MX80-1# show interfaces ge-1/0/4

encapsulation ethernet-bridge;
unit 0 {
    family bridge;
}

root@MX80-1# show bridge-domains

DEV {
    domain-type bridge;
    vlan-id 10;
    interface ge-1/0/1.2;
    interface ge-1/0/4.0;
}

MX80-2

root@MX80-2# show interfaces ge-1/0/7

flexible-vlan-tagging;
encapsulation flexible-ethernet-services;
unit 2 {
    encapsulation vlan-bridge;
    vlan-id 10;
}

root@MX80-2# show interfaces ge-1/1/1

encapsulation ethernet-bridge;
unit 0 {
    family bridge;
}

root@MX80-2# show bridge-domains

DEV {
     domain-type bridge;
     vlan-id 10;
     interface ge-1/0/7.2;
     interface ge-1/1/1.0;
}

MX80-client

root@MX80-client# show interfaces ge-1/0/2

unit 0 {
    family inet {
        address 200.200.200.1/30;
    }
}

root@MX80-client# run show interfaces ge-1/0/2

Physical interface: ge-1/0/2, Enabled, Physical link is Up
Interface index: 160, SNMP ifIndex: 514
Link-level type: Ethernet, MTU: 1514, Speed: 1000mbps, BPDU Error:
None, MAC-REWRITE Error: None, Loopback: Disabled,
Source filtering: Disabled, Flow control: Enabled, Auto-negotiation:
Enabled, Remote fault: Online, Speed-negotiation: Disabled,
Auto-MDIX: Enabled
Device flags   : Present Running
Interface flags: SNMP-Traps Internal: 0x0
Link flags     : None
CoS queues     : 8 supported, 8 maximum usable queues
Current address: 80:71:1f:c2:05:62, Hardware address: 80:71:1f:c2:05:62
Last flapped   : 2011-01-19 13:12:48 UTC (17:20:05 ago)
Input rate     : 0 bps (0 pps)
Output rate    : 0 bps (0 pps)
Active alarms  : None
Active defects : None

Logical interface ge-1/0/2.0 (Index 71) (SNMP ifIndex 656)
Flags: SNMP-Traps 0x0 Encapsulation: ENET2
Input packets : 30
Output packets: 9
Protocol inet, MTU: 1500
Flags: Sendbcast-pkt-to-re
Addresses, Flags: Is-Preferred Is-Primary
Destination: 200.200.200.0/30, Local: 200.200.200.1,
Broadcast: 200.200.200.3
Protocol multiservice, MTU: Unlimited

M120-client

root@M120# show interfaces ge-2/0/0

unit 0 {
    family inet {
        address 200.200.200.2/30;
    }
}

root@M120# run show interfaces ge-2/0/0

Physical interface: ge-2/0/0, Enabled, Physical link is Up
Interface index: 143, SNMP ifIndex: 523
Link-level type: Ethernet, MTU: 1514, Speed: 1000mbps, Loopback:
Disabled, Source filtering: Disabled, Flow control: Enabled,
Auto-negotiation: Enabled, Remote fault: Online
Device flags   : Present Running
Interface flags: SNMP-Traps Internal: 0x4000
Link flags     : None
CoS queues     : 8 supported, 8 maximum usable queues
Current address: 00:19:e2:67:f3:fc, Hardware address: 00:19:e2:67:f3:fc
Last flapped   : 2011-01-19 18:32:34 UTC (17:19:47 ago)
Input rate     : 0 bps (0 pps)
Output rate    : 0 bps (0 pps)
Active alarms  : None
Active defects : None

Logical interface ge-2/0/0.0 (Index 87) (SNMP ifIndex 310)
Flags: SNMP-Traps Encapsulation: ENET2
Input packets : 7
Output packets: 2430
Protocol inet, MTU: 1500
Flags: None
Addresses, Flags: Is-Preferred Is-Primary
Destination: 200.200.200.0/30, Local: 200.200.200.2,
Broadcast: 200.200.200.3

Проверка ICMP запросами

root@M120# run ping 200.200.200.1

PING 200.200.200.1 (200.200.200.1): 56 data bytes
64 bytes from 200.200.200.1: icmp_seq=0 ttl=64 time=0.541 ms
64 bytes from 200.200.200.1: icmp_seq=1 ttl=64 time=0.499 ms
64 bytes from 200.200.200.1: icmp_seq=2 ttl=64 time=0.496 ms
64 bytes from 200.200.200.1: icmp_seq=3 ttl=64 time=0.505 ms
^C
--- 200.200.200.1 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.496/0.510/0.541/0.018 ms

root@MX80-client# run ping 200.200.200.2

PING 200.200.200.2 (200.200.200.2): 56 data bytes
64 bytes from 200.200.200.2: icmp_seq=0 ttl=64 time=0.652 ms
64 bytes from 200.200.200.2: icmp_seq=1 ttl=64 time=0.511 ms
64 bytes from 200.200.200.2: icmp_seq=2 ttl=64 time=0.445 ms
64 bytes from 200.200.200.2: icmp_seq=3 ttl=64 time=0.504 ms
^C
--- 200.200.200.2 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.445/0.528/0.652/0.076 ms

Таблица MAC адресов на MX80`ых расположенных в центре по топологии

root@MX80-1# run show bridge mac-table

MAC flags (S -static MAC, D -dynamic MAC,
SE -Statistics enabled, NM -Non configured MAC)

Routing instance : default-switch
Bridging domain : DEV, VLAN : 10
MAC                 MAC      Logical
address             flags    interface
00:19:e2:67:f3:fc   D        ge-1/0/1.2
80:71:1f:c2:05:62   D        ge-1/0/4.0

root@MX80-2# run show bridge mac-table

MAC flags (S -static MAC, D -dynamic MAC,
SE -Statistics enabled, NM -Non configured MAC)

Routing instance : default-switch
Bridging domain : DEV, VLAN : 10
MAC                 MAC      Logical
address             flags    interface
00:19:e2:67:f3:fc   D        ge-1/1/1.0
80:71:1f:c2:05:62   D        ge-1/0/7.2

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