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Example: chain bridged ethernet

r1: 

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hostname r1
buggy
!
logging file debug ../binTmp/zzz96r1-log.run
!
bridge 1
 exit
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface bvi1
 no description
 vrf forwarding v1
 ipv4 address 1.1.1.1 255.255.255.0
 ipv6 address 1234::1 ffff::
 no shutdown
 no log-link-change
 exit
!
interface ethernet1
 no description
 bridge-group 1
 no shutdown
 no log-link-change
 exit
!
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server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end

r2: 

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hostname r2
buggy
!
logging file debug ../binTmp/zzz96r2-log.run
!
bridge 1
 mac-learn
 exit
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface bvi1
 no description
 vrf forwarding v1
 ipv4 address 1.1.1.2 255.255.255.0
 ipv6 address 1234::2 ffff::
 no shutdown
 no log-link-change
 exit
!
interface ethernet1
 no description
 bridge-group 1
 no shutdown
 no log-link-change
 exit
!
interface ethernet2
 no description
 bridge-group 1
 no shutdown
 no log-link-change
 exit
!
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server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end

r3: 

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hostname r3
buggy
!
logging file debug ../binTmp/zzz96r3-log.run
!
bridge 1
 mac-learn
 exit
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface bvi1
 no description
 vrf forwarding v1
 ipv4 address 1.1.1.3 255.255.255.0
 ipv6 address 1234::3 ffff::
 no shutdown
 no log-link-change
 exit
!
interface ethernet1
 no description
 bridge-group 1
 no shutdown
 no log-link-change
 exit
!
interface ethernet2
 no description
 bridge-group 1
 no shutdown
 no log-link-change
 exit
!
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server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end

r4: 

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hostname r4
buggy
!
logging file debug ../binTmp/zzz96r4-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface ethernet1
 no description
 vrf forwarding v1
 ipv4 address 1.1.1.4 255.255.255.0
 ipv6 address 1234::4 ffff::
 no shutdown
 no log-link-change
 exit
!
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server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end


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r2#
r2#
r2#show bridge 1
r2#show bridge 1
 |~~~~~~~~~~~|~~~~~~|~~~~~~|~~~~~|~~~~~|~~~~~~|~~~~~~|~~~~~~|~~~~~~|~~~~~|
 |                         | packet           | byte               |     |
 | iface     | fwd  | phys | tx  | rx  | drop | tx   | rx   | drop | grp |
 |-----------|------|------|-----|-----|------|------|------|------|-----|
 | brprt bvi |      |      |     |     |      |      |      |      |     |
 | ethernet1 | true | true | 87  | 78  | 0    | 5712 | 5114 | 0    |     |
 | ethernet2 | true | true | 107 | 107 | 0    | 7012 | 7024 | 0    |     |
 |___________|______|______|_____|_____|______|______|______|______|_____|
 |~~~~~~~~~~~~~~~~|~~~~~~~~~~~|~~~~~~~~|~~~~~~~~~~|~~~~|~~~~|~~~~~~|~~~~~~|~~~~~~|~~~~~~|
 |                                     | packet             | byte               |  |
 | addr           | iface     | static | time     | tx | rx | drop | tx   | rx   | drop |
 |----------------|-----------|--------|----------|----|----|------|------|------|------|
 | 0000.0000.4444 | ethernet2 | false  | 00:00:16 | 48 | 53 | 0    | 3168 | 3494 | 0    |
 | 0013.6746.3d29 | bvi       | false  | 00:00:16 | 74 | 78 | 0    | 4824 | 5096 | 0    |
 | 005a.1f6d.7a78 | ethernet1 | false  | 00:00:16 | 75 | 78 | 0    | 4854 | 5114 | 0    |
 | 006c.261d.7826 | ethernet2 | false  | 00:00:16 | 48 | 54 | 0    | 3168 | 3530 | 0    |
 |________________|___________|________|__________|____|____|______|______|______|______|
r2#
r2#

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r2#
r2#
r2#show inter bvi1 full
r2#show inter bvi1 full
bvi1 is up (since 00:00:16, 3 changes)
 description:
 type is bridged, hwaddr=0013.6746.3d29, mtu=1500, bw=100mbps, vrf=v1
 ip4 address=1.1.1.2/24, netmask=255.255.255.0, ifcid=613152601
 ip6 address=1234::2/16, netmask=ffff::, ifcid=1021797668
 received 87 packets (5730 bytes) dropped 0 packets (0 bytes)
 transmitted 78 packets (5096 bytes) promisc=false macsec=false sgt=false
 |~~~~~~~|~~~~|~~~~|~~~~~~|~~~~~|~~~~~|~~~~~~|
 |       | packet         | byte             |
 | time  | tx | rx | drop | tx  | rx  | drop |
 |-------|----|----|------|-----|-----|------|
 | 1sec  | 15 | 15 | 0    | 990 | 990 | 0    |
 | 1min  | 0  | 0  | 0    | 0   | 0   | 0    |
 | 1hour | 0  | 0  | 0    | 0   | 0   | 0    |
 |_______|____|____|______|_____|_____|______|
 |~~~~~~~~|~~~~~~~|~~~~~~~~~|~~~~|~~~~|~~~~~~|~~~~~~|~~~~~~|~~~~~~|
 |                          | packet         | byte               |
 | type   | value | handler | tx | rx | drop | tx   | rx   | drop |
 |--------|-------|---------|----|----|------|------|------|------|
 | ethtyp | 0000  | null    | 0  | 0  | 0    | 0    | 0    | 0    |
 | ethtyp | 0800  | ip4     | 42 | 42 | 0    | 2772 | 2772 | 0    |
 | ethtyp | 0806  | arp4    | 3  | 6  | 0    | 90   | 216  | 0    |
 | ethtyp | 86dd  | ip6     | 33 | 39 | 0    | 2234 | 2742 | 0    |
 |________|_______|_________|____|____|______|______|______|______|
 |~~~~~|~~~~|~~~~|
 | who | tx | rx |
 |-----|----|----|
 |_____|____|____|
 |~~~~~~~|~~~~~~|~~~~~~|
 | proto | pack | byte |
 |-------|------|------|
 | 0     | 3    | 90   |
 | 1     | 42   | 2772 |
 | 58    | 33   | 2234 |
 |_______|______|______|
 |~~~~~~~~~~~~|~~~~|~~~~|~~~~~~|~~~~~~|~~~~~~|~~~~~~|
 |            | packet         | byte               |
 | size       | tx | rx | drop | tx   | rx   | drop |
 |------------|----|----|------|------|------|------|
 | 0-255      | 78 | 87 | 0    | 5096 | 5730 | 0    |
 | 256-511    | 0  | 0  | 0    | 0    | 0    | 0    |
 | 512-767    | 0  | 0  | 0    | 0    | 0    | 0    |
 | 768-1023   | 0  | 0  | 0    | 0    | 0    | 0    |
 | 1024-1279  | 0  | 0  | 0    | 0    | 0    | 0    |
 | 1280-1535  | 0  | 0  | 0    | 0    | 0    | 0    |
 | 1536-1791  | 0  | 0  | 0    | 0    | 0    | 0    |
 | 1792-65535 | 0  | 0  | 0    | 0    | 0    | 0    |
 |____________|____|____|______|______|______|______|
 |~~~~~~~|~~~~~|~~~~~|~~~~~~|~~~~~~|~~~~~~|~~~~~~|
 |       | packet           | byte               |
 | class | cos | exp | prec | cos  | exp  | prec |
 |-------|-----|-----|------|------|------|------|
 | 0     | 78  | 78  | 78   | 5096 | 5096 | 5096 |
 | 1     | 0   | 0   | 0    | 0    | 0    | 0    |
 | 2     | 0   | 0   | 0    | 0    | 0    | 0    |
 | 3     | 0   | 0   | 0    | 0    | 0    | 0    |
 | 4     | 0   | 0   | 0    | 0    | 0    | 0    |
 | 5     | 0   | 0   | 0    | 0    | 0    | 0    |
 | 6     | 0   | 0   | 0    | 0    | 0    | 0    |
 | 7     | 0   | 0   | 0    | 0    | 0    | 0    |
 |_______|_____|_____|______|______|______|______|
         26k|
         23k|   #
         21k|   #
         18k|   #
         15k|   #
         13k|#  #
         10k|#  #
        7920|#  #    #      #
        5280|#  # #  #   #  #
        2640|#  #### #   ## #
           0|# ####### # ####
         bps|0---------10--------20--------30--------40--------50-------- seconds
           1|
           0|
           0|
           0|
           0|
           0|
           0|
           0|
           0|
           0|
           0|
         bps|0---------10--------20--------30--------40--------50-------- minutes
           1|
           0|
           0|
           0|
           0|
           0|
           0|
           0|
           0|
           0|
           0|
         bps|0---------10--------20--------30--------40--------50-------- hours
r2#
r2#

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r2#
r2#
r2#show ipv4 arp bvi1
r2#show ipv4 arp bvi1
 |~~~~~~~~~~~~~~~~|~~~~~~~~~|~~~~~~~~~~|~~~~~~~~|
 | mac            | address | time     | static |
 |----------------|---------|----------|--------|
 | 005a.1f6d.7a78 | 1.1.1.1 | 00:00:15 | false  |
 | 006c.261d.7826 | 1.1.1.3 | 00:00:15 | false  |
 | 0000.0000.4444 | 1.1.1.4 | 00:00:15 | false  |
 |________________|_________|__________|________|
r2#
r2#

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r2#
r2#
r2#show ipv6 neigh bvi1
r2#show ipv6 neigh bvi1
 |~~~~~~~~~~~~~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~~~~~~|~~~~~~~~|~~~~~~~~|
 | mac            | address                  | time     | static | router |
 |----------------|--------------------------|----------|--------|--------|
 | 005a.1f6d.7a78 | 1234::1                  | 00:00:16 | false  | false  |
 | 006c.261d.7826 | 1234::3                  | 00:00:16 | false  | false  |
 | 0000.0000.4444 | 1234::4                  | 00:00:16 | false  | false  |
 | 0000.0000.4444 | fe80::200:ff:fe00:4444   | 00:00:16 | false  | true   |
 | 005a.1f6d.7a78 | fe80::25a:1fff:fe6d:7a78 | 00:00:16 | false  | true   |
 | 006c.261d.7826 | fe80::26c:26ff:fe1d:7826 | 00:00:16 | false  | true   |
 |________________|__________________________|__________|________|________|
r2#
r2#