__特___集__
この記事は、改訂＆リニューアルして『P はプロトコルのP - UDLD を究める』へ移転しました。
UDLD を究める(15)UDLD のデバッグ(1)ネイバー関係の確立
debug コマンドを使って、ポートがリンクアップしてから、Bidirectional となるまでの流れを見ていきます。
※ 本ページでは、Debug コマンドを使用します。
本ページの内容を実際に試される場合は、事前に「Debug コマンドについて」をお読みください。
Catalyst#debug udld events
UDLD events debugging is on
Catalyst#debug udld packets
UDLD packets debugging is on
Catalyst#
ログ中の色づけされた16進数は、以下のとおりです。
- Device ID
Port ID
Echo
Message Interval
Catalyst-A
リンクアップしました。
*Mar 5 22:04:53: UDLD send probe message, flags = rec_timeout | resynch (Gi0/11)①
*Mar 5 22:04:53: Pr (Gi0/11)
*Mar 5 22:04:54: UDLD send probe message, flags = rec_timeout | resynch (Gi0/11)
*Mar 5 22:04:54: Pr (Gi0/11)
*Mar 5 22:04:55: UDLD send probe message, flags = rec_timeout | resynch (Gi0/11)
*Mar 5 22:04:55: Pr (Gi0/11)
*Mar 5 22:04:56: UDLD send probe message, flags = rec_timeout | resynch (Gi0/11)
*Mar 5 22:04:56: Pr (Gi0/11)
*Mar 5 22:04:57: UDLD send probe message, flags = rec_timeout | resynch (Gi0/11)
*Mar 5 22:04:57: Pr (Gi0/11)
*Mar 5 22:04:58: UDLD send probe message, flags = rec_timeout | resynch (Gi0/11)
*Mar 5 22:04:58: Pr (Gi0/11)
*Mar 5 22:04:59: UDLD send probe message, flags = rec_timeout | resynch (Gi0/11)
*Mar 5 22:04:59: Pr (Gi0/11)
*Mar 5 22:05:00: UDLD send probe message, flags = rec_timeout | resynch (Gi0/11)
*Mar 5 22:05:00: Pr (Gi0/11)
*Mar 5 22:05:01: UDLD send probe message, flags = rec_timeout (Gi0/11)②
*Mar 5 22:05:01: P (Gi0/11)
*Mar 5 22:05:08: UDLD send probe message, flags = rec_timeout (Gi0/11)
*Mar 5 22:05:08: P (Gi0/11)
*Mar 5 22:05:15: UDLD send probe message, flags = rec_timeout (Gi0/11)
*Mar 5 22:05:15: P (Gi0/11)
*Mar 5 22:05:22: UDLD send probe message, flags = rec_timeout (Gi0/11)
*Mar 5 22:05:22: P (Gi0/11)
*Mar 5 22:05:29: UDLD send probe message, flags = rec_timeout (Gi0/11)
*Mar 5 22:05:29: P (Gi0/11)
*Mar 5 22:05:36: UDLD send probe message, flags = rec_timeout (Gi0/11)
*Mar 5 22:05:36: P (Gi0/11)
*Mar 5 22:05:43: UDLD send probe message, flags = rec_timeout (Gi0/11)
(中略)
*Mar 5 22:06:49: udld process packet received, length 99 (Gi0/11)③
*Mar 5 22:06:49: 21 01 62 47 00 01 00 0F 43 48 4B 30 36 31 39 57 30 4D 55 00
*Mar 5 22:06:49: 02 00 0A 47 69 30 2F 31 32 00 03 00 08 00 00 00 00 00 04 00 ④
*Mar 5 22:06:49: 05 07 00 05 00 05 05 00 06 00 16 43 61 74 61 6C 79 73 74 33
*Mar 5 22:06:49: 35 35 30 2D 31 32 54 3A 43 00 07 00 08 00 00 00 05
*Mar 5 22:06:49: TLV = 1 TLV length = 15 (Gi0/11)
*Mar 5 22:06:49: item_len[1] = 12 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 58 (Gi0/11)
*Mar 5 22:06:49: TLV = 2 TLV length = 10 (Gi0/11)
*Mar 5 22:06:49: item_len[2] = 7 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 48 (Gi0/11)
*Mar 5 22:06:49: TLV = 3 TLV length = 8 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 40 (Gi0/11)
*Mar 5 22:06:49: TLV = 4 TLV length = 5 (Gi0/11)
*Mar 5 22:06:49: item_len[4] = 1 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 35 (Gi0/11)
*Mar 5 22:06:49: TLV = 5 TLV length = 5 (Gi0/11)
*Mar 5 22:06:49: item_len[5] = 1 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 30 (Gi0/11)
*Mar 5 22:06:49: TLV = 6 TLV length = 22 (Gi0/11)
*Mar 5 22:06:49: item_len[6] = 19 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 8 (Gi0/11)
*Mar 5 22:06:49: TLV = 7 TLV length = 8 (Gi0/11)
*Mar 5 22:06:49: item_len[7] = 4 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 0 (Gi0/11)
*Mar 5 22:06:49: Parse packet info and insert entry (0xD8BA50) into cache. (Gi0/11)
*Mar 5 22:06:49: Cached TLV #1 = CHK0619W0MU, length = 11 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #2 = Gi0/12, length = 6 (Gi0/11)
*Mar 5 22:06:49: udld_handle_bidirdetect_info (Gi0/11)
*Mar 5 22:06:49: udld_handle_bidirdetect_info pairs = 0 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #4 = 7, length = 0 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #5 = 5, length = 0 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #6 = Catalyst3550-12T:C, length = 18 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #7, val = 3 length = 5 (Gi0/11)
*Mar 5 22:06:49: New_entry = D8BA50 (Gi0/11)
*Mar 5 22:06:49: Device Index = 1 (Gi0/11)
*Mar 5 22:06:49: First entry (Gi0/11)
*Mar 5 22:06:49: Probe packet (Gi0/11)
*Mar 5 22:06:49: Zero IDs in 2way conn list (Gi0/11)
*Mar 5 22:06:49: Non-RSY new neighbor (Gi0/11)
*Mar 5 22:06:49: Udld entering detection phase. (Gi0/11)
*Mar 5 22:06:49: UDLD send echo message, flags = 0 (Gi0/11)
*Mar 5 22:06:49: E (Gi0/11) ⑤
*Mar 5 22:06:49: Zero IDs in 2way conn list (Gi0/11)
*Mar 5 22:06:49: Zero IDs in 2way conn list (Gi0/11)
*Mar 5 22:06:49: UDLD FSM updated port, bi-flag udld_empty_echo, phase udld_detection (Gi0/11) ⑥
*Mar 5 22:06:49: Udld receive packet *END*. (Gi0/11)
*Mar 5 22:06:49: udld process packet received, length 120 (Gi0/11) ⑦
*Mar 5 22:06:49: 22 00 C9 95 00 01 00 0F 43 48 4B 30 36 31 39 57 30 4D 55 00
*Mar 5 22:06:49: 02 00 0A 47 69 30 2F 31 32 00 03 00 1D 00 00 00 01 00 0B 46
*Mar 5 22:06:49: 41 41 30 35 34 39 53 30 41 54 00 06 47 69 30 2F 31 31 00 04
*Mar 5 22:06:49: 00 05 07 00 05 00 05 05 00 06 00 16 43 61 74 61 6C 79 73 74
*Mar 5 22:06:49: 33 35 35 30 2D 31 32 54 3A 43 00 07 00 08 00 00 00 01
*Mar 5 22:06:49: TLV = 1 TLV length = 15 (Gi0/11)
*Mar 5 22:06:49: item_len[1] = 12 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 79 (Gi0/11)
*Mar 5 22:06:49: TLV = 2 TLV length = 10 (Gi0/11)
*Mar 5 22:06:49: item_len[2] = 7 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 69 (Gi0/11)
*Mar 5 22:06:49: TLV = 3 TLV length = 29 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 40 (Gi0/11)
*Mar 5 22:06:49: TLV = 4 TLV length = 5 (Gi0/11)
*Mar 5 22:06:49: item_len[4] = 1 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 35 (Gi0/11)
*Mar 5 22:06:49: TLV = 5 TLV length = 5 (Gi0/11)
*Mar 5 22:06:49: item_len[5] = 1 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 30 (Gi0/11)
*Mar 5 22:06:49: TLV = 6 TLV length = 22 (Gi0/11)
*Mar 5 22:06:49: item_len[6] = 19 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 8 (Gi0/11)
*Mar 5 22:06:49: TLV = 7 TLV length = 8 (Gi0/11)
*Mar 5 22:06:49: item_len[7] = 4 (Gi0/11)
*Mar 5 22:06:49: Bytes left = 0 (Gi0/11)
*Mar 5 22:06:49: Parse packet info and insert entry (0x1141168) into cache. (Gi0/11)
*Mar 5 22:06:49: Cached TLV #1 = CHK0619W0MU, length = 11 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #2 = Gi0/12, length = 6 (Gi0/11)
*Mar 5 22:06:49: udld_handle_bidirdetect_info (Gi0/11)
*Mar 5 22:06:49: udld_handle_bidirdetect_info pair left = 1 (Gi0/11)
*Mar 5 22:06:49: FAA0549S0AT device (Gi0/11)
*Mar 5 22:06:49: udld_handle_bidirdetect_info: good packet (Gi0/11)
*Mar 5 22:06:49: Cached TLV #4 = 7, length = 0 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #5 = 5, length = 0 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #6 = Catalyst3550-12T:C, length = 18 (Gi0/11)
*Mar 5 22:06:49: Cached TLV #7, val = 3 length = 1 (Gi0/11)
*Mar 5 22:06:49: New_entry = 1141168 (Gi0/11)
*Mar 5 22:06:49: Found an entry from same device (Gi0/11)
*Mar 5 22:06:49: Cached entries = 2 (Gi0/11)
*Mar 5 22:06:49: Entry (0xD8BA50) deleted: 1 entries cached
*Mar 5 22:06:49: Cached entries = 1 (Gi0/11)
*Mar 5 22:06:49: Echo packet (Gi0/11)
*Mar 5 22:06:49: Checking if multiple neighbors (Gi0/11)
*Mar 5 22:06:49: Single neighbor detected (Gi0/11)
*Mar 5 22:06:49: Checking if link is bidirectional (Gi0/11)
*Mar 5 22:06:49: Found my own ID pair in 2way conn list (Gi0/11)
*Mar 5 22:06:49: Checking if multiple neighbors (Gi0/11)
*Mar 5 22:06:49: Single neighbor detected (Gi0/11)
*Mar 5 22:06:49: Checking if link is bidirectional (Gi0/11)
*Mar 5 22:06:49: Found my own ID pair in 2way conn list (Gi0/11)
*Mar 5 22:06:49: UDLD FSM updated port, bi-flag udld_bidir_detected, phase udld_detection (Gi0/11)⑨
*Mar 5 22:06:49: Udld receive packet *END*. (Gi0/11)
*Mar 5 22:06:50: timeout timer = 4 (Gi0/11)
*Mar 5 22:06:50: UDLD send echo message, flags = 0 (Gi0/11)
*Mar 5 22:06:50: E (Gi0/11)⑧
（中略）
*Mar 5 22:06:54: Phase set to udld_advertisement from phase udld_detection. (Gi0/11)⑩
*Mar 5 22:06:54: Phase set to udld_advertisement after timer_expired. (Gi0/11)
① 1秒間隔で、Probe を送信しています。 Recommended Timeout とReSynch フラグがセットされています。Pr はProbe を意味します。
② 8秒経過すると、以後のProbe はRe-Synch フラグをリセットし、7秒間隔で送信されます。
③ 対向機器からのUDLD PDU をGigabitEthernet0/11 で受信しました。
④ Echo TLV は空
⑤ ここまでが一つのUDLD PDU です。E はEcho を意味します。
⑥ Detection フェイズへ移行します。
⑦ 次のUDLD PDU を受信しました。Echo TLV から、対向機器が自分のUDLD PDU を受信できていることがわかります（対向機器もDetection フェイズへ移行しているはずです)。
Message Interval は7になっています。
⑧ ここまでが一つのUDLD PDU です。E はEcho を意味します。
⑨ Bidirectional になりました。
⑩ Advertisement フェイズへ移行します。
UDLD を究める (1) はじめに
UDLD を究める (2)Bidirectional とUnidirectional
UDLD を究める (3)UDLD とAuto Negotiation
UDLD を究める (4)UDLD の基本動作
UDLD を究める (5)UDLD のパケットフォーマット
UDLD を究める (6)UDLD のタイマー
UDLD を究める (7)Bidirectional State
UDLD を究める (8)Operartional State
UDLD を究める (9)UDLD のアルゴリズム(1)ネイバー関係の確立
UDLD を究める(10)UDLD のアルゴリズム(2)Unidirectional を検知する
UDLD を究める(11)UDLD アグレッシブモード
UDLD を究める(12)UDLD ノーマルモードとアグレッシブモードの互換性
UDLD を究める(13)設定用コマンド
UDLD を究める(14)show コマンド
UDLD を究める(15)UDLD のデバッグ(1)ネイバー関係の確立
UDLD を究める(16)UDLD のデバッグ(2)Unidirectional を検知する
UDLD を究める(17)UDLD のテスト環境を構築する
UDLD を究める(付録) UDLD の状態遷移を時系列で観察する
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