bgp：与 79.170.119.177 的会话失败（打开消息错误：不支持的选项参数

网络工程 思科 bgp
2021-07-11 02:44:50

情况如下。我有一个 Nexus 设备 5000 系列和一个带有 Nortel Layer2-3 GbE 交换机模块（光纤）的 IBM 刀片中心。
这两个设备是直接连接的。在 Nexus 上，我有一个 vlan Vlan153 79.170.119.177，在 Nortel 上，我有一个带有 IP IP 的 vlan 153：79.170.119.178。IP是可以ping通的。

一旦我想设置 bgp 会话（is 和 iBGP），我发现了一个问题，这是来自 nortel 设备的日志消息：

bgp: session with 79.170.119.177 failed (OPEN Message Error : Unsupported Opt Param

并且 Nexus 上的 bgp 会话处于空闲状态：

79.170.119.178  4 25286      28      43        0    0    0 00:27:06 Idle

在 Nexus 端使用调试命令我有以下内容：

Nexus1# debug bgp all

Nexus1# 2014 Dec 25 12:16:01.992881 bgp: 25286 [1191] EVT: Executing bgp_damp_timer_callback
2014 Dec 25 12:16:04.192908 bgp: 25286 [1191] EVT: Sent periodic cleanup message to bgp_cleanup_mq
2014 Dec 25 12:16:04.192953 bgp: 25286 [1191] EVT: Starting periodic BRIB processing
2014 Dec 25 12:16:04.192994 bgp: 25286 [1191] (default) BRIB: [IPv4 Unicast] Inspecting prefix 0.0.0.0/0 f or cleanup
2014 Dec 25 12:16:04.193029 bgp: 25286 [1191] (default) BRIB: [IPv4 Unicast] Inspecting prefix 79.170.112. 0/24 for cleanup
2014 Dec 25 12:16:04.193052 bgp: 25286 [1191] (default) EVT: [IPv4 Unicast] Table cleanup refcount 5
2014 Dec 25 12:16:04.193071 bgp: 25286 [1191] (default) EVT: vrf_ctx cleanup: refcount 4
2014 Dec 25 12:16:04.392857 bgp: 25286 [1191] (default) EVT: 79.170.119.178 peer connection retry timer ex pired
2014 Dec 25 12:16:04.393249 bgp: 25286 [1191] (default) EVT: 79.170.119.178 Triggered active open for peer
2014 Dec 25 12:16:04.393294 bgp: 25286 [1191] (default) EVT: 79.170.119.178 went from Idle to Active (Acti ve setup)
2014 Dec 25 12:16:04.395711 bgp: 25286 [1191] (default) EVT: 79.170.119.178 Schedule wait for connect
2014 Dec 25 12:16:04.395730 bgp: 25286 [1191] (default) EVT: 79.170.119.178 Wait (5 sec) for session setup response
2014 Dec 25 12:16:04.967477 bgp: 25286 [1191] (default) EVT: 79.170.119.178 connect to peer is successful
2014 Dec 25 12:16:04.967497 bgp: 25286 [1191] (default) EVT: 79.170.119.178 sending OPEN message to peer
2014 Dec 25 12:16:04.967513 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 Sending OPEN, version 4, AS 25 286, hold-time 180, router-id 79.170.112.13
2014 Dec 25 12:16:04.967527 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending (old) dynamic capabili ty (66/0) to peer
2014 Dec 25 12:16:04.967540 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending dynamic capability (67 /3) to peer
2014 Dec 25 12:16:04.967552 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending (old) route refresh ca pability (128/0) to peer
2014 Dec 25 12:16:04.967565 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending route refresh capabili ty (2/0) to peer
2014 Dec 25 12:16:04.967578 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending [IPv4 Unicast] capabil ity (1/4) to peer
2014 Dec 25 12:16:04.967591 bgp: 25286 [1191] (default) ADJ: my restart time 120 restart state 0
2014 Dec 25 12:16:04.967603 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending graceful restart capab ility (64/6) to peer
2014 Dec 25 12:16:04.967616 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending 4-byte AS capability ( 65/4) to peer
2014 Dec 25 12:16:04.967626 bgp: 25286 [1191] Hexdump at 0x8338d5c, 62 bytes:
2014 Dec 25 12:16:04.967641 bgp: 25286 [1191]      FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
2014 Dec 25 12:16:04.967655 bgp: 25286 [1191]      003E0104 62C600B4 4FAA700D 21021F42
2014 Dec 25 12:16:04.967669 bgp: 25286 [1191]      00430302 01408000 02000104 00010001
2014 Dec 25 12:16:04.967682 bgp: 25286 [1191]      40060078 00010100 41040000 62C6
2014 Dec 25 12:16:04.972618 bgp: 25286 [1191] (default) EVT: 79.170.119.178 went from Active to OpenSent ( Active setup)
2014 Dec 25 12:16:04.972646 bgp: 25286 [1191] (default) EVT: 79.170.119.178 Wait (5 sec) for session setup response
2014 Dec 25 12:16:04.974110 bgp: 25286 [1191] (default) EVT: Peer 79.170.119.178 closed connection
2014 Dec 25 12:16:04.974129 bgp: 25286 [1191] (default) EVT: 79.170.119.178 Error session closed (during s ession open) in session to peer, value 0, state OpenSent
2014 Dec 25 12:16:04.974147 bgp: 25286 [1191] (default) EVT: [IPv4 Unicast] 79.170.119.178 GR state: none, saved flags: 0
2014 Dec 25 12:16:04.974162 bgp: 25286 [1191] (default) EVT: 79.170.119.178 cleaning up active peer setup, thread id 0x0
2014 Dec 25 12:16:04.974224 bgp: 25286 [1191] EVT: Starting fd_close processing 45702
2014 Dec 25 12:16:06.560128 bgp: 25286 [1191] (default) EVT: Connection request from peer 79.170.119.178 p ort 3196 fd 51, vrf default
2014 Dec 25 12:16:06.560944 bgp: 25286 [1191] (default) EVT: 79.170.119.178 went from Idle to Connect (Pas sive setup)
2014 Dec 25 12:16:06.560962 bgp: 25286 [1191] (default) EVT: 79.170.119.178 sending OPEN message to peer
2014 Dec 25 12:16:06.560977 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 Sending OPEN, version 4, AS 25 286, hold-time 180, router-id 79.170.112.13
2014 Dec 25 12:16:06.560990 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending (old) dynamic capabili ty (66/0) to peer
2014 Dec 25 12:16:06.561003 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending dynamic capability (67 /3) to peer
2014 Dec 25 12:16:06.561017 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending (old) route refresh ca pability (128/0) to peer
2014 Dec 25 12:16:06.561030 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending route refresh capabili ty (2/0) to peer
2014 Dec 25 12:16:06.561044 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending [IPv4 Unicast] capabil ity (1/4) to peer
2014 Dec 25 12:16:06.561056 bgp: 25286 [1191] (default) ADJ: my restart time 120 restart state 0
2014 Dec 25 12:16:06.561068 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending graceful restart capab ility (64/6) to peer
2014 Dec 25 12:16:06.561081 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending 4-byte AS capability ( 65/4) to peer
2014 Dec 25 12:16:06.561092 bgp: 25286 [1191] Hexdump at 0x8338d5c, 62 bytes:
2014 Dec 25 12:16:06.561107 bgp: 25286 [1191]      FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
2014 Dec 25 12:16:06.561121 bgp: 25286 [1191]      003E0104 62C600B4 4FAA700D 21021F42
2014 Dec 25 12:16:06.561135 bgp: 25286 [1191]      00430302 01408000 02000104 00010001
2014 Dec 25 12:16:06.561149 bgp: 25286 [1191]      40060078 00010100 41040000 62C6
2014 Dec 25 12:16:06.561386 bgp: 25286 [1191] (default) EVT: 79.170.119.178 went from Connect to OpenSent (Passive setup)
2014 Dec 25 12:16:06.561407 bgp: 25286 [1191] (default) EVT: 79.170.119.178 Wait (5 sec) for session setup response
2014 Dec 25 12:16:06.974556 bgp: 25286 [1191] (default) EVT: 79.170.119.178 Process OPEN message from peer
2014 Dec 25 12:16:06.974575 bgp: 25286 [1191] Hexdump at 0x8338d5c, 29 bytes:
2014 Dec 25 12:16:06.974591 bgp: 25286 [1191]      FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
2014 Dec 25 12:16:06.974604 bgp: 25286 [1191]      001D0104 62C600B4 4FAA77AB 00
2014 Dec 25 12:16:06.974624 bgp: 25286 [1191] (default) ADJ: 79.170.119.178 sending first KEEPALIVE to pee r
2014 Dec 25 12:16:06.976266 bgp: 25286 [1191] (default) EVT: 79.170.119.178 went from OpenSent to OpenConf irm (Passive setup)
2014 Dec 25 12:16:06.976285 bgp: 25286 [1191] (default) EVT: 79.170.119.178 Wait (5 sec) for session setup response
2014 Dec 25 12:16:06.977226 bgp: 25286 [1191] (default) ADJ: Expected first keepalive from 79.170.119.178, got msg type 3
2014 Dec 25 12:16:06.977245 bgp: 25286 [1191] (default) EVT: Received NOTIFICATION unsupported optional pa ram error (0) from 79.170.119.178
2014 Dec 25 12:16:06.977267 bgp: 25286 [1191] (default) EVT: Reset by peer (unsupported optional param err or (0)) in session to 79.170.119.178, value 0, state was OpenConfirm
2014 Dec 25 12:16:06.977284 bgp: 25286 [1191] (default) EVT: [IPv4 Unicast] 79.170.119.178 GR state: none, saved flags: 0
2014 Dec 25 12:16:06.977298 bgp: 25286 [1191] (default) EVT: 79.170.119.178 cleaning up passive peer setup , thread id 0x0
2014 Dec 25 12:16:06.977356 bgp: 25286 [1191] EVT: Starting fd_close processing 45703
q2014 Dec 25 12:16:09.502893 bgp: 25286 [1191] (default) EVT: 212.73.206.121 keepalive timer fired for pee r
2014 Dec 25 12:16:09.502918 bgp: 25286 [1191] (default) ADJ: 212.73.206.121 sending KEEPALIVE
2014 Dec 25 12:16:09.503650 bgp: 25286 [1191] (default) EVT: 212.73.206.121 next keepalive expiry due in 0 0:00:29

        ^
% Invalid command at '^' marker.
Nexus1# 2014 Dec 25 12:16:12.002923 bgp: 25286 [1191] EVT: Executing bgp_damp_timer_callback
2014 Dec 25 12:16:12.549401 bgp: 25286 [1191] (default) ADJ: 212.73.206.121 KEEPALIVE rcvd

Nexus1# 2014 Dec 25 12:16:18.103086 bgp: 25286 [1191] (default) EVT: 79.170.119.162 keepalive timer fired for peer
2014 Dec 25 12:16:18.103107 bgp: 25286 [1191] (default) ADJ: 79.170.119.162 sending KEEPALIVE
2014 Dec 25 12:16:18.109973 bgp: 25286 [1191] (default) EVT: 79.170.119.162 next keepalive expiry due in 0 0:00:59
2014 Dec 25 12:16:18.110002 bgp: 25286 [1191] (default) EVT: 79.170.119.236 keepalive timer fired for peer
2014 Dec 25 12:16:18.110022 bgp: 25286 [1191] (default) ADJ: 79.170.119.236 sending KEEPALIVE
2014 Dec 25 12:16:18.110050 bgp: 25286 [1191] (default) EVT: 79.170.119.236 next keepalive expiry due in 0 0:00:59

这里有没有人遇到过类似的情况并且知道不支持哪些参数？

1个回答

请参阅RFC 4271 第 6.2 节，特别是：

如果 OPEN 消息中的可选参数之一被识别，但格式错误，则错误子码必须设置为 0（非特定）。

理想情况下，来自北电的调试输出在这里会更有用，但很明显北电不喜欢 Nexus 发送的 BGP 功能。除非您从 Nortel 设备获得类似的调试输出，否则没有真正的方法可以判断哪些选项触发了错误，但我会首先在 Nexus 上为该对等点禁用这些可选参数 - 诸如路由刷新和/或 4-字节 ASN。可能还有助于禁用 Nexus 上的所有参数以启动 BGP 会话，然后开始一次启用它们，直到出现错误以找出导致问题的可选功能。

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