CRS-1实验指南(3)

不配置BFD FOR OSPF， 验证路由收敛情况

非直连链路断掉情况模拟（链路断掉，但接口仍然处于UP状态

cc07-6500-4(config)#int ten 1/3

cc07-6500-4(config-if)#switchport access vlan 100

不配置BFD， 需要较长时间HELLO TIME超时，始收敛

RP/0/RP0/CPU0:ch03-crs-1#sh route ospf Fri Jul 30 23:45:07.775 AEST

O E1 30.0.0.0/24 [110/7] via 10.1.12.1, 00:00:01, TenGigE0/1/2/0 O E1 30.0.1.0/24 [110/7] via 10.1.12.1, 00:00:01, TenGigE0/1/2/0 O E1 30.0.2.0/24 [110/7] via 10.1.12.1, 00:00:01, TenGigE0/1/2/0 O E1 30.0.3.0/24 [110/7] via 10.1.12.1, 00:00:01, TenGigE0/1/2/0 O E1 30.0.4.0/24 [110/7] via 10.1.12.1, 00:00:01, TenGigE0/1/2/0 O E1 30.0.5.0/24 [110/7] via 10.1.12.1, 00:00:01, TenGigE0/1/2/0 O E1 30.0.6.0/24 [110/7] via 10.1.12.1, 00:00:01, TenGigE0/1/2/0 O E1 30.0.7.0/24 [110/7] via 10.1.12.1, 00:00:01, TenGigE0/1/2/0

配置BFD FOR OSPF：

在CH09的ten1/6/0/0上启用BFD

RP/0/RP0/CPU0:ch09-crs-1#sh run router ospf 100 Fri Jul 30 23:56:19.750 AEST router ospf 100

bfd minimum-interval 15 bfd multiplier 2 area 0

interface TenGigE1/6/0/0 bfd fast-detect

路由才开 在CH03的ten0/1/0/0上启用BFD

RP/0/RP0/CPU0:ch03-crs-1(config-ospf-ar-if)#do sh run router ospf Fri Jul 30 23:57:37.569 AEST router ospf 100

bfd minimum-interval 15 bfd multiplier 2 area 0

interface TenGigE0/1/0/0 bfd fast-detect !

记录当前BFD状态：

RP/0/RP0/CPU0:ch09-crs-1#sh bfd ipv4 session detail Fri Jul 30 23:55:47.895 AEST

I/f: TenGigE1/6/0/0, Location: 1/6/CPU0, dest: 10.1.10.2, src: 10.1.10.1 State: UP for 0d:0h:5m:34s, number of times UP: 1 Received parameters:

Version: 1, desired tx interval: 2 s, required rx interval: 2 s Required echo rx interval: 1 ms, multiplier: 2, diag: None

My discr: 327689, your discr: 18415626, state UP, D/F/P/C/A: 0/0/0/1/0 Transmitted parameters:

Version: 1, desired tx interval: 2 s, required rx interval: 2 s Required echo rx interval: 1 ms, multiplier: 2, diag: None

My discr: 18415626, your discr: 327689, state UP, D/F/P/C/A: 0/0/0/1/0 Timer Values:

Local negotiated async tx interval: 2 s Remote negotiated async tx interval: 2 s

Desired echo tx interval: 15 ms, local negotiated echo tx interval: 15 ms Echo detection time: 30 ms(15 ms*2), async detection time: 4 s(2 s*2) Local Stats:

Intervals between async packets:

Tx: Number of intervals=100, min=1665 ms, max=1985 ms, avg=1815 ms Last packet transmitted 1967 ms ago

Rx: Number of intervals=100, min=1667 ms, max=2 s, avg=1852 ms Last packet received 619 ms ago Intervals between echo packets:

Tx: Number of intervals=100, min=17 ms, max=17 ms, avg=17 ms Last packet transmitted 7 ms ago

Rx: Number of intervals=100, min=17 ms, max=17 ms, avg=17 ms Last packet received 7 ms ago

Latency of echo packets (time between tx and rx):

Number of packets: 100, min=0 us, max=0 us, avg=0 us Session owner information:

Client Desired interval Multiplier ---------------- ------------------------ --------------

isis-100 15 ms 2 ospf-100 15 ms 2

验证BFD FOR OSPF效果，模拟非直连链路断掉路由收敛时间：200ms时间， OSPF自动收敛

RP/0/RP0/CPU0:ch03-crs-1(config-ospf-ar-if)#do sh route ospf Sat Jul 31 00:02:09.132 AEST

O E1 30.0.0.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.1.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.2.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.3.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.4.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.5.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.6.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.7.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.8.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0 O E1 30.0.9.0/24 [110/7] via 10.1.12.1, 00:00:07, TenGigE0/1/2/0

BGP实验

CH03 BGP配置：

RP/0/RP0/CPU0:ch03-crs-1#sh run route-policy pass-all Sat Jul 31 00:05:30.058 AEST route-policy pass-all pass end-policy !

RP/0/RP0/CPU0:ch03-crs-1#sh run router bgp Sat Jul 31 00:05:35.462 AEST router bgp 1001

bgp router-id 192.168.10.1 address-family ipv4 unicast !

neighbor 192.168.10.2 remote-as 1

address-family ipv4 unicast route-policy pass-all in route-policy pass-all out ! ! !

记录BGP路由条目数目(30万条)

RP/0/RP0/CPU0:ch09-crs-1(config-bgp-nbr-af)#do sh route summ Sat Jul 31 00:58:39.559 AEST

Route Source Routes Backup Deleted Memory (bytes) connected 4 0 0 552 local 5 0 0 620 static 2 0 0 248

dagr 0 0 0 0 isis 100 7500 4 0 930720 bgp 1001 300000 0 0 37200000 ospf 100 51 0 0 6380 Total 307562 4 0 38138520

策略控制， 如下所示所有Community为 1:1的路由需要全部被过滤

RP/0/RP0/CPU0:ch09-crs-1#sh bgp 50.0.0.0 Sat Jul 31 01:00:00.555 AEST

BGP routing table entry for 50.0.0.0/24 Versions:

Process bRIB/RIB SendTblVer Speaker 928522 928522 Last Modified: Jul 31 00:57:57.029 for 00:02:03 Paths: (1 available, best #1) Not advertised to any peer Path #1: Received by speaker 0 1

192.168.20.2 from 192.168.20.2 (192.168.20.2) Origin IGP, localpref 100, valid, external, best Community: 1:1

配置route-policy

RP/0/RP0/CPU0:ch09-crs-1#sh run route-policy GUARD_PREFIX Sat Jul 31 01:03:37.553 AEST route-policy GUARD_PREFIX

if community matches-any (1:1) then drop endif end-policy !

RP/0/RP0/CPU0:ch09-crs-1#sh run route-policy BGP_IN Sat Jul 31 01:03:45.168 AEST route-policy BGP_IN apply GUARD_PREFIX pass end-policy !

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