Hi,
I am having a problem when LDP attempts to setup a session.
According to Wikipedia's LDP page
<https://en.wikipedia.org/wiki/Label_Distribution_Protocol>, LDP first
exchanges packets on UDP and then start a session by setting up TCP
connection.
UDP packets from control plane to data plane are sent, but the TCP
connection is not set up.
Here is what show trace shows:
==================
UDP
==================
Packet 8
00:10:18:346891: dpdk-input
GigabitEthernet13/0/0 rx queue 0
buffer 0x6468: current data 14, length 70, free-list 0, clone-count 0,
totlen-nifb 0, trace 0x7
ext-hdr-valid
l4-cksum-computed l4-cksum-correct l2-hdr-offset 0
l3-hdr-offset 14
PKT MBUF: port 0, nb_segs 1, pkt_len 84
buf_len 2176, data_len 84, ol_flags 0x0, data_off 128, phys_addr
0x3fd91a80
packet_type 0x10 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
Packet Types
RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
IP4: 00:0c:29:3a:39:d7 -> 01:00:5e:00:00:02
UDP: 192.168.1.1 -> 224.0.0.2
tos 0xc0, ttl 1, length 70, checksum 0xc20e
fragment id 0x152d, flags DONT_FRAGMENT
UDP: 646 -> 646
length 50, checksum 0x245a
00:10:18:346913: ip4-input
UDP: 192.168.1.1 -> 224.0.0.2
tos 0xc0, ttl 1, length 70, checksum 0xc20e
fragment id 0x152d, flags DONT_FRAGMENT
UDP: 646 -> 646
length 50, checksum 0x245a
00:10:18:346925: ip4-mfib-forward-lookup
fib 0 entry 6
00:10:18:346931: ip4-mfib-forward-rpf
entry 6 itf -1 flags
====================
TCP
====================
Packet 12
00:10:21:474191: dpdk-input
GigabitEthernet13/0/0 rx queue 0
buffer 0x6441: current data 14, length 60, free-list 0, clone-count 0,
totlen-nifb 0, trace 0xb
ext-hdr-valid
l4-cksum-computed l4-cksum-correct l2-hdr-offset 0
l3-hdr-offset 14
PKT MBUF: port 0, nb_segs 1, pkt_len 74
buf_len 2176, data_len 74, ol_flags 0x0, data_off 128, phys_addr
0x3fd910c0
packet_type 0x10 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
Packet Types
RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
IP4: 00:0c:29:3a:39:d7 -> 00:0c:29:d6:93:93
TCP: 1.1.1.1 -> 2.2.2.2
tos 0xc0, ttl 255, length 60, checksum 0x74f6
fragment id 0x0000, flags DONT_FRAGMENT
TCP: 646 -> 57413
seq. 0xbb729c35 ack 0x6382b56c
flags 0x12 SYN ACK, tcp header: 40 bytes
window 28960, checksum 0x5590
00:10:21:474204: ip4-input
TCP: 1.1.1.1 -> 2.2.2.2
tos 0xc0, ttl 255, length 60, checksum 0x74f6
fragment id 0x0000, flags DONT_FRAGMENT
TCP: 646 -> 57413
seq. 0xbb729c35 ack 0x6382b56c
flags 0x12 SYN ACK, tcp header: 40 bytes
window 28960, checksum 0x5590
00:10:21:474216: ip4-lookup
fib 0 dpo-idx 0 flow hash: 0x00000000
TCP: 1.1.1.1 -> 2.2.2.2
tos 0xc0, ttl 255, length 60, checksum 0x74f6
fragment id 0x0000, flags DONT_FRAGMENT
TCP: 646 -> 57413
seq. 0xbb729c35 ack 0x6382b56c
flags 0x12 SYN ACK, tcp header: 40 bytes
window 28960, checksum 0x5590
00:10:21:474231: ip4-drop
TCP: 1.1.1.1 -> 2.2.2.2
tos 0xc0, ttl 255, length 60, checksum 0x74f6
fragment id 0x0000, flags DONT_FRAGMENT
TCP: 646 -> 57413
seq. 0xbb729c35 ack 0x6382b56c
flags 0x12 SYN ACK, tcp header: 40 bytes
window 28960, checksum 0x5590
00:10:21:474233: error-drop
ip4-input: valid ip4 packets
what is the problem??
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