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RFC 2545 has a limitation on third party next-hops where the next hop is propagated unchanged. Due to this limitation, BGP inet6 RR (Route-Reflector) router attaches the BGP neighbor's IPv6 global address and its own IPv6 link-local address as the next-hops while advertising the route to another BGP neighbor.
This could introduce the forwarding issue on the BGP neighbor from other vendors if their device picks up the link-local address as next-hop. This would put the BGP RR router in the traffic forwarding path unexpectedly. This issue will not be seen on Juniper devices because IPv6 link-local address would not be selected as prefix's next hop.
On a Multi-access/Broadcast network, some 3rd party BGP router unexpectedly selects RR router as the prefix nexthop and forwards the IPv6 traffic to this RR router.
BGP inet6 Route-Reflector router attaches the BGP neighbor's IPv6 global address and its own IPv6 link-local address as the next-hops while advertising the route to another BGP neighbor.
This could introduce the forwarding issue on the BGP neighbor from other vendors if their device picks up the link-local address as next-hop. This would put the BGP RR router in the traffic forwarding path unexpectedly.
The DUT <BGP RR> relay inet6 BGP prefixes between its ibgp neighbor and ebgp neighbor. However, when RR advertises the prefix to neighbors, attaches the BGP neighbor's IPv6 global address and its own IPv6 link-local address as the next-hops while advertising the route to another BGP neighbor, this could introduce the forwarding issue on the BGP neighbor from other vendors if their device picks up the link-local address as next-hop. This would put the BGP RR router in the traffic forwarding path unexpectedly.
This issue will not be seen on Juniper devices because IPv6 link-local address would not be selected as prefix's next hop.
In one customer case, the Cisco router <ebgp> picked up RR's link local address as next-hop and forward the IPv6 traffic to RR, which is an unexpected behavior.
Topology:
=========
ibgp ----+---- RR
|
ebgp
Juniper TAC Lab Test:
====================
jtac-mx480-r006 (xe-2/0/0) ----- QFX ----- (xe-0/0/0) jtac-mx80t-r003
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|
jtac-mx80t-r004 (ge-1/0/0)
DUT - RR:
labroot@cyress-re0> show interfaces xe-2/0/0 | match :: Destination: 2001:8003:8a:1700::/64, Local: 2001:8003:8a:1700:1:ae:0:a2 Destination: fe80::/64, Local: fe80::6687:8806:a568:7a94
ibgp neighbor:
labroot@ironhide> show interfaces xe-0/0/0 | match :: Destination: 2001:8003:8a:1700::/64, Local: 2001:8003:8a:1700:4:ae:100:3 Destination: fe80::/64, Local: fe80::223:9c06:a5f8:b918
ebgp neighbor:
labroot@jtac-MX80T-r004> show interfaces ge-1/0/0 | match :: Destination: 2001:8003:8a:1700::/64, Local: 2001:8003:8a:1700:6:52:0:fc01 Destination: fe80::/64, Local: fe80::5e5e:ab06:a50d:3960
DUT:
labroot@cyress-re0> show bgp summary Groups: 2 Peers: 2 Down peers: 0 Table Tot Paths Act Paths Suppressed History Damp State Pending inet6.0 4 2 0 0 0 0 Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped... 2001:8003:8a:1700:4:ae:100:3 64520 23 20 0 1 8:16 Establ inet6.0: 1/2/2/0 2001:8003:8a:1700:6:52:0:fc01 64800 22 20 0 1 8:09 Establ inet6.0: 1/2/2/0 labroot@cyress-re0> monitor traffic interface xe-2/0/0.0 extensive no-resolve [...]
RR (DUT) received prefix - 2001:1111:222:3333::3/128 from IBGP neighbor 2001:8003:8a:1700:4:ae:100:3 (fe80::223:9c06:a5f8:b918)
15:33:45.295706 In Juniper PCAP Flags [Ext, no-L2, In], PCAP Extension(s) total length 16 Device Media Type Extension TLV #3, length 1, value: Flexible-Ethernet-Services (52) Logical Interface Encapsulation Extension TLV #6, length 1, value: Ethernet (14) Device Interface Index Extension TLV #1, length 2, value: 181 Logical Interface Index Extension TLV #4, length 4, value: 338 -----original packet----- PFE proto 6 (ipv6): (class 0xc0, flowlabel 0xf9ef7, hlim 64, next-header: TCP (6), length: 166) 2001:8003:8a:1700:4:ae:100:3.51664 > 2001:8003:8a:1700:1:ae:0:a2.179: P 102:236(134) ack 113 win 16384 <nop,nop,timestamp 152310324 152328051>: BGP, length: 134 Update Message (2), length: 104 Origin (1), length: 1, Flags [T]: IGP 0x0000: 00 AS Path (2), length: 0, Flags [T]: empty Local Preference (5), length: 4, Flags [T]: 100 0x0000: 0000 0064 Multi-Protocol Reach NLRI (14), length: 63, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) nexthop: 2001:8003:8a:1700:4:ae:100:3fe80::223:9c06:a5f8:b918, nh-length: 32, no SNPA 2001:1111:222:3333::3/128 2001:8003:8a:1700::/64 0x0000: 0002 0120 2001 8003 008a 1700 0004 00ae 0x000f: 0100 0003 fe80 0000 0000 0000 0223 9c06 0x001f: a5f8 b918 0080 2001 1111 0222 3333 0000 0x002f: 0000 0000 0003 4020 0180 0300 8a17 00 Update Message (2), length: 30 Multi-Protocol Unreach NLRI (15), length: 3, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) End-of-Rib Marker (empty NLRI) 0x0000: 0002 01
RR (DUT) advertised prefix - 2001:1111:222:3333::3/128 to EBGP neighbor 2001:8003:8a:1700:6:52:0:fc01 with the following nexthops:
IBGP global IPv6 address 2001:8003:8a:1700:4:ae:100:3 and its own link local address fe80::6687:8806:a568:7a94
15:33:52.037895 Out Juniper PCAP Flags [Ext], PCAP Extension(s) total length 16 Device Media Type Extension TLV #3, length 1, value: Flexible-Ethernet-Services (52) Logical Interface Encapsulation Extension TLV #6, length 1, value: Ethernet (14) Device Interface Index Extension TLV #1, length 2, value: 181 Logical Interface Index Extension TLV #4, length 4, value: 338 -----original packet----- 64:87:88:68:7a:94 > 5c:5e:ab:0d:39:60, ethertype 802.1Q (0x8100), length 214: vlan 1701, p 6, ethertype IPv6, (class 0xc0, flowlabel 0x7ba63, hlim 1, next-header: TCP (6), length: 156) 2001:8003:8a:1700:1:ae:0:a2.179 > 2001:8003:8a:1700:6:52:0:fc01.53703: P 83:207(124) ack 83 win 16384 <nop,nop,timestamp 152334794 152315826>: BGP, length: 124 Update Message (2), length: 94 Origin (1), length: 1, Flags [T]: IGP 0x0000: 00 AS Path (2), length: 6, Flags [T]: 64520 0x0000: 0201 0000 fc08 Multi-Protocol Reach NLRI (14), length: 54, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) nexthop: 2001:8003:8a:1700:4:ae:100:3fe80::6687:8806:a568:7a94, nh-length: 32, no SNPA 2001:1111:222:3333::3/128 0x0000: 0002 0120 2001 8003 008a 1700 0004 00ae 0x000f: 0100 0003 fe80 0000 0000 0000 6687 8806 0x001f: a568 7a94 0080 2001 1111 0222 3333 0000 0x002f: 0000 0000 0003 Update Message (2), length: 30 Multi-Protocol Unreach NLRI (15), length: 3, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) End-of-Rib Marker (empty NLRI) 0x0000: 0002 01
RR (DUT) received prefix - 2001:1111:222:3333::2/128 from eBGP neighbor 2001:8003:8a:1700:6:52:0:fc01 (fe80::5e5e:ab06:a50d:3960)
15:33:52.039452 In Juniper PCAP Flags [Ext, no-L2, In], PCAP Extension(s) total length 16 Device Media Type Extension TLV #3, length 1, value: Flexible-Ethernet-Services (52) Logical Interface Encapsulation Extension TLV #6, length 1, value: Ethernet (14) Device Interface Index Extension TLV #1, length 2, value: 181 Logical Interface Index Extension TLV #4, length 4, value: 338 -----original packet----- PFE proto 6 (ipv6): (class 0xc0, flowlabel 0x791ad, hlim 1, next-header: TCP (6), length: 165) 2001:8003:8a:1700:6:52:0:fc01.53703 > 2001:8003:8a:1700:1:ae:0:a2.179: P 83:216(133) ack 83 win 16384 <nop,nop,timestamp 152316029 152334696>: BGP, length: 133 Update Message (2), length: 103 Origin (1), length: 1, Flags [T]: IGP 0x0000: 00 AS Path (2), length: 6, Flags [T]: 64800 0x0000: 0201 0000 fd20 Multi-Protocol Reach NLRI (14), length: 63, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) nexthop: 2001:8003:8a:1700:6:52:0:fc01fe80::5e5e:ab06:a50d:3960, nh-length: 32, no SNPA 2001:1111:222:3333::2/128 2001:8003:8a:1700::/64 0x0000: 0002 0120 2001 8003 008a 1700 0006 0052 0x000f: 0000 fc01 fe80 0000 0000 0000 5e5e ab06 0x001f: a50d 3960 0080 2001 1111 0222 3333 0000 0x002f: 0000 0000 0002 4020 0180 0300 8a17 00 Update Message (2), length: 30 Multi-Protocol Unreach NLRI (15), length: 3, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) End-of-Rib Marker (empty NLRI) 0x0000: 0002 01
RR (DUT) advertised prefix - 2001:1111:222:3333::2/128 to iBGP neighbor 2001:8003:8a:1700:4:ae:100:3 with following nexthops:
EBGP global IPv6 address 2001:8003:8a:1700:6:52:0:fc01 and its own link local address fe80::6687:8806:a568:7a94
15:33:52.244859 Out Juniper PCAP Flags [Ext], PCAP Extension(s) total length 16 Device Media Type Extension TLV #3, length 1, value: Flexible-Ethernet-Services (52) Logical Interface Encapsulation Extension TLV #6, length 1, value: Ethernet (14) Device Interface Index Extension TLV #1, length 2, value: 181 Logical Interface Index Extension TLV #4, length 4, value: 338 -----original packet----- 64:87:88:68:7a:94 > 00:23:9c:f8:b9:18, ethertype 802.1Q (0x8100), length 191: vlan 1701, p 6, ethertype IPv6, (class 0xc0, flowlabel 0x49a28, hlim 64, next-header: TCP (6), length: 133) 2001:8003:8a:1700:1:ae:0:a2.179 > 2001:8003:8a:1700:4:ae:100:3.51664: P 113:214(101) ack 236 win 16384 <nop,nop,timestamp 152335001 152310324>: BGP, length: 101 Update Message (2), length: 101 Origin (1), length: 1, Flags [T]: IGP 0x0000: 00 AS Path (2), length: 6, Flags [T]: 64800 0x0000: 0201 0000 fd20 Local Preference (5), length: 4, Flags [T]: 100 0x0000: 0000 0064 Multi-Protocol Reach NLRI (14), length: 54, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) nexthop: 2001:8003:8a:1700:6:52:0:fc01fe80::6687:8806:a568:7a94, nh-length: 32, no SNPA 2001:1111:222:3333::2/128 0x0000: 0002 0120 2001 8003 008a 1700 0006 0052 0x000f: 0000 fc01 fe80 0000 0000 0000 6687 8806 0x001f: a568 7a94 0080 2001 1111 0222 3333 0000 0x002f: 0000 0000 0002
This issue will not be seen on Juniper devices because IPv6 link-local address would not be selected as prefix's next hop.
IBGP router result:
inet6.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 2001:1111:222:3333::2/128 *[BGP/170] 00:07:06, localpref 100, from 2001:8003:8a:1700:1:ae:0:a2 AS path: 64800 I, validation-state: unverified > to 2001:8003:8a:1700:6:52:0:fc01 via xe-0/0/0.0 2001:1111:222:3333::3/128 *[Direct/0] 00:59:05 > via lo0.0
EBGP router result:
inet6.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 2001:1111:222:3333::2/128 *[Direct/0] 01:21:01 > via lo0.0 2001:1111:222:3333::3/128 *[BGP/170] 00:07:17, localpref 100, from 2001:8003:8a:1700:1:ae:0:a2 AS path: 64520 I, validation-state: unverified > to 2001:8003:8a:1700:4:ae:100:3 via ge-1/0/0.0
PR1402255 - On the multi-access/broadcast network, 3rd party BGP router may unexpectedly select RR router as next-hop to forward the IPv6 traffic resolved the issue.
The Juniper TAC test result listed as follows:
RR (DUT) received prefix - 2001:1111:222:3333::2/128 from eBGP neighbor 2001:8003:8a:1700:6:52:0:fc01 (fe80::5e5e:ab06:a50d:3960)
23:14:04.600868 In
Juniper PCAP Flags [Ext, no-L2, In], PCAP Extension(s) total length 16 Device Media Type Extension TLV #3, length 1, value: Flexible-Ethernet-Services (52) Logical Interface Encapsulation Extension TLV #6, length 1, value: Ethernet (14) Device Interface Index Extension TLV #1, length 2, value: 187 Logical Interface Index Extension TLV #4, length 4, value: 345 -----original packet----- PFE proto 6 (ipv6): (class 0xc0, flowlabel 0x31db5, hlim 1, next-header: TCP (6), length: 165) 2001:8003:8a:1700:6:52:0:fc01.49221 > 2001:8003:8a:1700:1:ae:0:a2.179: P 83:216(133) ack 191 win 16384 <nop,nop,timestamp 957544112 2148451632>: BGP, length: 133 Update Message (2), length: 103 Origin (1), length: 1, Flags [T]: IGP 0x0000: 00 AS Path (2), length: 6, Flags [T]: 64800 0x0000: 0201 0000 fd20 Multi-Protocol Reach NLRI (14), length: 63, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) nexthop: 2001:8003:8a:1700:6:52:0:fc01fe80::5e5e:ab06:a50d:3960, nh-length: 32, no SNPA 2001:1111:222:3333::2/128 2001:8003:8a:1700::/64 0x0000: 0002 0120 2001 8003 008a 1700 0006 0052 0x000f: 0000 fc01 fe80 0000 0000 0000 5e5e ab06 0x001f: a50d 3960 0080 2001 1111 0222 3333 0000 0x002f: 0000 0000 0002 4020 0180 0300 8a17 00 Update Message (2), length: 30 Multi-Protocol Unreach NLRI (15), length: 3, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) End-of-Rib Marker (empty NLRI) 0x0000: 0002 01 0600 0000 6c03 1db5 00a5 0601 2001 8003 008a 1700 0006 0052 0000 fc01 2001 8003 008a 1700 0001 00ae 0000 00a2 c045 00b3 2d12 81c3 28da 0682 8018 4000 4fc0 0000 0101 080a 3912 f6b0 800e c530 ffff ffff ffff ffff ffff ffff ffff ffff 0067 0200 0000 5040 0101 0040 0206 0201 0000 fd20 900e 003f 0002 0120 2001 8003 008a 1700 0006 0052 0000 fc01 fe80 0000 0000 0000 5e5e ab06 a50d 3960 0080 2001 1111 0222 3333 0000 0000 0000 0002 4020 0180 0300 8a17 00ff ffff ffff ffff ffff ffff ffff ffff ff00 1e02 0000 0007 900f 0003 0002 01
RR (DUT) sent prefix - 2001:1111:222:3333::2/128 to iBGP neighbor 2001:8003:8a:1700:4:ae:100:3 with eBGP neighbor global IPv6 address only
23:14:04.802762 Out
Juniper PCAP Flags [Ext], PCAP Extension(s) total length 16 Device Media Type Extension TLV #3, length 1, value: Flexible-Ethernet-Services (52) Logical Interface Encapsulation Extension TLV #6, length 1, value: Ethernet (14) Device Interface Index Extension TLV #1, length 2, value: 187 Logical Interface Index Extension TLV #4, length 4, value: 345 -----original packet----- 64:87:88:68:7a:94 > 00:23:9c:f8:b9:18, ethertype 802.1Q (0x8100), length 175: vlan 1701, p 6, ethertype IPv6, (class 0xc0, flowlabel 0xe1ae0, hlim 64, next-header: TCP (6), length: 117) 2001:8003:8a:1700:1:ae:0:a2.179 > 2001:8003:8a:1700:4:ae:100:3.52860: P 113:198(85) ack 236 win 16384 <nop,nop,timestamp 2148451838 957539312>: BGP, length: 85 Update Message (2), length: 85 Origin (1), length: 1, Flags [T]: IGP 0x0000: 00 AS Path (2), length: 6, Flags [T]: 64800 0x0000: 0201 0000 fd20 Local Preference (5), length: 4, Flags [T]: 100 0x0000: 0000 0064 Multi-Protocol Reach NLRI (14), length: 38, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) nexthop: 2001:8003:8a:1700:6:52:0:fc01, nh-length: 16, no SNPA 2001:1111:222:3333::2/128 0x0000: 0002 0110 2001 8003 008a 1700 0006 0052 0x000f: 0000 fc01 0080 2001 1111 0222 3333 0000 0x001f: 0000 0000 0002 0023 9cf8 b918 6487 8868 7a94 8100 c6a5 86dd 6c0e 1ae0 0075 0640 2001 8003 008a 1700 0001 00ae 0000 00a2 2001 8003 008a 1700 0004 00ae 0100 0003 00b3 ce7c a7a2 bf3e 530f 6ae0 8018 4000 697c 0000 0101 080a 800e c5fe 3912 e3f0 ffff ffff ffff ffff ffff ffff ffff ffff 0055 0200 0000 3e40 0101 0040 0206 0201 0000 fd20 4005 0400 0000 6490 0e00 2600 0201 1020 0180 0300 8a17 0000 0600 5200 00fc 0100 8020 0111 1102 2233 3300 0000 0000 0000 02
RR (DUT) received prefix - 2001:1111:222:3333::3/128 from iBGP neighbor 2001:8003:8a:1700:4:ae:100:3 (fe80::223:9c06:a5f8:b918)
23:14:04.513529 In Juniper PCAP Flags [Ext, no-L2, In], PCAP Extension(s) total length 16 Device Media Type Extension TLV #3, length 1, value: Flexible-Ethernet-Services (52) Logical Interface Encapsulation Extension TLV #6, length 1, value: Ethernet (14) Device Interface Index Extension TLV #1, length 2, value: 187 Logical Interface Index Extension TLV #4, length 4, value: 345 -----original packet----- PFE proto 6 (ipv6): (class 0xc0, flowlabel 0xc11a0, hlim 64, next-header: TCP (6), length: 166) 2001:8003:8a:1700:4:ae:100:3.52860 > 2001:8003:8a:1700:1:ae:0:a2.179: P 102:236(134) ack 113 win 16384 <nop,nop,timestamp 957539312 2148451548>: BGP, length: 134 Update Message (2), length: 104 Origin (1), length: 1, Flags [T]: IGP 0x0000: 00 AS Path (2), length: 0, Flags [T]: empty Local Preference (5), length: 4, Flags [T]: 100 0x0000: 0000 0064 Multi-Protocol Reach NLRI (14), length: 63, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) nexthop: 2001:8003:8a:1700:4:ae:100:3fe80::223:9c06:a5f8:b918, nh-length: 32, no SNPA 2001:1111:222:3333::3/128 2001:8003:8a:1700::/64 0x0000: 0002 0120 2001 8003 008a 1700 0004 00ae 0x000f: 0100 0003 fe80 0000 0000 0000 0223 9c06 0x001f: a5f8 b918 0080 2001 1111 0222 3333 0000 0x002f: 0000 0000 0003 4020 0180 0300 8a17 00 Update Message (2), length: 30 Multi-Protocol Unreach NLRI (15), length: 3, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) End-of-Rib Marker (empty NLRI) 0x0000: 0002 01 0600 0000 6c0c 11a0 00a6 0640 2001 8003 008a 1700 0004 00ae 0100 0003 2001 8003 008a 1700 0001 00ae 0000 00a2 ce7c 00b3 530f 6a5a a7a2 bf3e 8018 4000 4089 0000 0101 080a 3912 e3f0 800e c4dc ffff ffff ffff ffff ffff ffff ffff ffff 0068 0200 0000 5140 0101 0040 0200 4005 0400 0000 6490 0e00 3f00 0201 2020 0180 0300 8a17 0000 0400 ae01 0000 03fe 8000 0000 0000 0002 239c 06a5 f8b9 1800 8020 0111 1102 2233 3300 0000 0000 0000 0340 2001 8003 008a 1700 ffff ffff ffff ffff ffff ffff ffff ffff 001e 0200 0000 0790 0f00 0300 0201
RR (DUT) sent prefix - 2001:1111:222:3333::3/128 to eBGP neighbor 2001:8003:8a:1700:6:52:0:fc01 with IBGP neighbor global IPv6 address only
23:14:04.596745 Out Juniper PCAP Flags [Ext], PCAP Extension(s) total length 16 Device Media Type Extension TLV #3, length 1, value: Flexible-Ethernet-Services (52) Logical Interface Encapsulation Extension TLV #6, length 1, value: Ethernet (14) Device Interface Index Extension TLV #1, length 2, value: 187 Logical Interface Index Extension TLV #4, length 4, value: 345 -----original packet----- 64:87:88:68:7a:94 > 5c:5e:ab:0d:39:60, ethertype 802.1Q (0x8100), length 198: vlan 1701, p 6, ethertype IPv6, (class 0xc0, flowlabel 0xa3db4, hlim 1, next-header: TCP (6), length: 140) 2001:8003:8a:1700:1:ae:0:a2.179 > 2001:8003:8a:1700:6:52:0:fc01.49221: P 83:191(108) ack 83 win 16384 <nop,nop,timestamp 2148451632 957544006>: BGP, length: 108 Update Message (2), length: 30 Multi-Protocol Unreach NLRI (15), length: 3, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) End-of-Rib Marker (empty NLRI) 0x0000: 0002 01 Update Message (2), length: 78 Origin (1), length: 1, Flags [T]: IGP 0x0000: 00 AS Path (2), length: 6, Flags [T]: 64520 0x0000: 0201 0000 fc08 Multi-Protocol Reach NLRI (14), length: 38, Flags [OE]: AFI: IPv6 (2), SAFI: Unicast (1) nexthop: 2001:8003:8a:1700:4:ae:100:3, nh-length: 16, no SNPA 2001:1111:222:3333::3/128 0x0000: 0002 0110 2001 8003 008a 1700 0004 00ae 0x000f: 0100 0003 0080 2001 1111 0222 3333 0000 0x001f: 0000 0000 0003 5c5e ab0d 3960 6487 8868 7a94 8100 c6a5 86dd 6c0a 3db4 008c 0601 2001 8003 008a 1700 0001 00ae 0000 00a2 2001 8003 008a 1700 0006 0052 0000 fc01 00b3 c045 28da 0616 2d12 81c3 8018 4000 ac27 0000 0101 080a 800e c530 3912 f646 ffff ffff ffff ffff ffff ffff ffff ffff 001e 0200 0000 0790 0f00 0300 0201 ffff ffff ffff ffff ffff ffff ffff ffff 004e 0200 0000 3740 0101 0040 0206 0201 0000 fc08 900e 0026 0002 0110 2001 8003 008a 1700 0004 00ae 0100 0003 0080 2001 1111 0222 3333 0000 0000 0000 0003
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