今回はOSPFのRetransmission Packet Pacing Timerについて解説します。
この記事の目次
座学
Retransmission Packet Pacing Timer
OSPFでは再送キューに複数のLSUパケットが存在する場合、Retransmission Packet Pacing Timer間隔でLSUパケットを再送します。
実機での動作確認
検証内容
R1のg2、R2のg2でOSPF Area 0を有効にします。
Network TypeにはPoint-to-Pointを使用します。
Retransmission Packet Pacing Timerのパラメータを確認します。
初期設定
interface GigabitEthernet2
ip address 10.1.1.1 255.255.255.0
ip ospf network point-to-point
!
router ospf 1
router-id 1.1.1.1
network 10.1.1.0 0.0.0.255 area 0
interface GigabitEthernet2
ip address 10.1.1.2 255.255.255.0
ip ospf network point-to-point
!
router ospf 1
router-id 2.2.2.2
network 10.1.1.0 0.0.0.255 area 0
Retransmission Packet Pacing Timerの変更前
OSPFプロセスの状態確認
R1のRetransmission Packet Pacing Timerが66ミリ秒であることが確認できます。
R1
R1#show ip ospf
Routing Process "ospf 1" with ID 1.1.1.1
Start time: 2w1d, Time elapsed: 00:07:51.340
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
Supports NSSA (compatible with RFC 3101)
Supports Database Exchange Summary List Optimization (RFC 5243)
Event-log enabled, Maximum number of events: 1000, Mode: cyclic
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 50 msecs
Minimum hold time between two consecutive SPFs 200 msecs
Maximum wait time between two consecutive SPFs 5000 msecs
Incremental-SPF disabled
Initial LSA throttle delay 50 msecs
Minimum hold time for LSA throttle 200 msecs
Maximum wait time for LSA throttle 5000 msecs
Minimum LSA arrival 100 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
EXCHANGE/LOADING adjacency limit: initial 300, process maximum 300
.
<一部省略>
Retransmission Packet Pacing Timerの変更後
R1のRetransmission Packet Pacing Timerを100ミリ秒に変更します。
追加した設定
Retransmission Packet Pacing Timerはtimers pacing retransmission <milli-second>コマンドで変更可能です。
R1
router ospf 1
timers pacing retransmission 100
OSPFプロセスの状態確認
R1のRetransmission Packet Pacing Timerが100ミリ秒に変化したことが確認できます。
R1
R1#show ip ospf
Routing Process "ospf 1" with ID 1.1.1.1
Start time: 2w1d, Time elapsed: 00:14:50.982
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
Supports NSSA (compatible with RFC 3101)
Supports Database Exchange Summary List Optimization (RFC 5243)
Event-log enabled, Maximum number of events: 1000, Mode: cyclic
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 50 msecs
Minimum hold time between two consecutive SPFs 200 msecs
Maximum wait time between two consecutive SPFs 5000 msecs
Incremental-SPF disabled
Initial LSA throttle delay 50 msecs
Minimum hold time for LSA throttle 200 msecs
Maximum wait time for LSA throttle 5000 msecs
Minimum LSA arrival 100 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 50 msecs
Retransmission pacing timer 66 msecs
EXCHANGE/LOADING adjacency limit: initial 300, process maximum 300
.
<一部省略>
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