注意：这个编辑器搞乱了wireshark捕获的文本对齐
Cisco IOS XR路由器向ODL PCE发送PCEP请求以进行路径计算，并获取PCEP错误消息类型6值1：强制对象丢失，RP对象丢失。
Wireshark显示PCEP客户端（路由器）发送带有RP对象的PCE请求消息，因此错误似乎是矛盾的。虽然我们注意到RP对象正在设置OF标志（对象标志），该标志未在RFC 5440中定义，并且仅在RFC 5541中引入，因此ODL可能因为未报告的标志而拒绝此PCEP请求。
但是，使用Cisco PCE控制器（XTC）时，它可以正常工作。
任何想法可能导致ODL控制器拒绝此PCE请求消息，如果问题是OF标志，如何配置ODL服务器以支持它.... 以下是此PCE请求和回复消息的wirekshare捕获：PCC（Cisco路由器）到PCE（ODL Beryllium）的PCE请求消息
第一个数据包是从PCC（Cisco路由器）到ODL PCE，这是PCE请求
No. Time Source Destination Protocol Length Info
1 2017-11-09 15:39:54.619757083 10.92.224.112 10.93.1.11 PCEP 162 Path Computation Request (PCReq)
Frame 1: 162 bytes on wire (1296 bits), 162 bytes captured (1296 bits) on interface 0
Ethernet II, Src: Cisco_66:aa:3d (70:e4:22:66:aa:3d), Dst: Dell_c9:03:6a (ec:f4:bb:c9:03:6a)
802.1Q Virtual LAN, PRI: 0, CFI: 0, ID: 10
Internet Protocol Version 4, Src: 10.92.224.112, Dst: 10.93.1.11
Transmission Control Protocol, Src Port: 17568, Dst Port: 4189, Seq: 1, Ack: 1, Len: 104
Source Port: 17568
Destination Port: 4189
[Stream index: 0]
[TCP Segment Len: 104]
Sequence number: 1 (relative sequence number)
[Next sequence number: 105 (relative sequence number)]
Acknowledgment number: 1 (relative ack number)
Header Length: 20 bytes
Flags: 0x018 (PSH, ACK)
Window size value: 63986
[Calculated window size: 63986]
[Window size scaling factor: -1 (unknown)]
Checksum: 0x7acc [unverified]
[Checksum Status: Unverified]
Urgent pointer: 0
[SEQ/ACK analysis]
[PDU Size: 104]
Path Computation Element communication Protocol
Path Computation Request (PCReq) Header
RP object
Object Class: RP OBJECT (2)
0001 .... = RP Object-Type: Request Parameters (1)
Flags
Object Length: 20
Reserved: 0x00
Flags: 0x000080
0000 0000 0... .... .... .... = Reserved Flags: Not set
.... .... .0.. .... .... .... = (C) Core-tree computation: Not set
.... .... ..0. .... .... .... = (F) Fragmentation: Not set
.... .... ...0 .... .... .... = (N) P2MP: Not set
.... .... .... 0... .... .... = (E) ERO-compression: Not set
.... .... .... .0.. .... .... = (M) Make-before-break: Not set
.... .... .... ..0. .... .... = (D) Report the request order: Not set
.... .... .... ...0 .... .... = (P) Path Key: Not set
.... .... .... .... 1... .... = (S) Supply OF on response: Set
.... .... .... .... .0.. .... = (V) VSPT: Not set
.... .... .... .... ..0. .... = (L) Strict/Loose: Not set
.... .... .... .... ...0 .... = (B) Bi-directional: Not set
.... .... .... .... .... 0... = (R) Reoptimization: Not set
.... .... .... .... .... .000 = (PRI) Priority: Off
Requested ID Number: 0x0000000c
PATH-SETUP-TYPE
Type: PATH-SETUP-TYPE (28)
Length: 4
Reserved: 0x000000
Path Setup Type: Path is setup using Segment Routing (1)
END-POINT object
LSP object
LSPA object
BANDWIDTH object
METRIC object
第二个数据包是从ODL PCE到PCC（Cisco路由器）的PCE回复：
No. Time Source Destination Protocol Length Info
2 2017-11-09 15:39:54.622698028 10.93.1.11 10.92.224.112 PCEP 66 Error (PCErr)
Frame 2: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) on interface 0
Ethernet II, Src: Dell_c9:03:6a (ec:f4:bb:c9:03:6a), Dst: Cisco_66:aa:3d (70:e4:22:66:aa:3d)
Internet Protocol Version 4, Src: 10.93.1.11, Dst: 10.92.224.112
Transmission Control Protocol, Src Port: 4189, Dst Port: 17568, Seq: 1, Ack: 105, Len: 12
Source Port: 4189
Destination Port: 17568
[Stream index: 0]
[TCP Segment Len: 12]
Sequence number: 1 (relative sequence number)
[Next sequence number: 13 (relative sequence number)]
Acknowledgment number: 105 (relative ack number)
Header Length: 20 bytes
Flags: 0x018 (PSH, ACK)
Window size value: 229
[Calculated window size: 229]
[Window size scaling factor: -1 (unknown)]
Checksum: 0x7621 [unverified]
[Checksum Status: Unverified]
Urgent pointer: 0
[SEQ/ACK analysis]
[PDU Size: 12]
Path Computation Element communication Protocol
Error (PCErr) Header
ERROR object
Object Class: PCEP ERROR OBJECT (13)
0001 .... = PCEP-ERROR Object-Type: PCEP Error (1)
Flags
Object Length: 8
Reserved: 0x00
Flags: 0x00
Error-Type: Mandatory Object Missing (6)
Error-Value: RP object missing (1)