BGP 监控协议(BMP)

2021-07-29 | No comments

BGP监控协议BGP Monitoring Protocol（BMP）能够对网络中的设备的BGP运行状态进行实时监控，BGP运行状态包括对等体关系的建立与解除、路由信息刷新等。

路由器只需要与BMP server建立一个TCP连接，后续就可以发送BMP的数据包。

BMP的数据包包含以下7种类型：

Initiation消息：初始化消息，向监控服务器通告厂商信息、版本号等。
PU（Peer Up Notification）消息：向监控服务器上报与对等体BGP连接的建立。
RM（Route Monitoring）消息：路由监控消息，向监控服务器发送从对等体收到的所有路由，并随时向监控服务器上报路由的新增或撤销。
PD（Peer Down Notification）消息：向监控服务器上报与对等体BGP连接的中断。
SR（Stats Reports）消息：向监控服务器上报路由器运行状态的统计信息。
Termination消息：结束消息，向监控服务器通告关闭BMP会话的原因。

与其他厂商的BMP实现对比来看， Cisco这里新增了一个报文“Route Mirroring”，用来更新其他类型的BGP报文，但是从IOS XR设备的测试来开，并没有发现此类新增报文。

RP/0/RP0/CPU0:CRS-H#show bgp bmp  server 1        
Thu Jul 29 06:15:37.127 UTC
BMP server 1
Host 10.70.79.197 Port 5000
Connected for 01:18:08
Last Disconnect event received : 00:00:00
Precedence:  internet
BGP neighbors: 1
VRF: calo-mgmt (0x60000002)
Update Source: 172.18.87.66 (Mg0/RP0/CPU0/0)
Update Source Vrf ID: 0x60000002

Queue write pulse sent            : Jul 29 06:15:26.601, Jul 29 04:57:03.914 (all)
Queue write pulse received        : Jul 29 06:15:26.601
Update Mode : Route Monitoring Post-Policy
Queue Route Mon Msg buffer limit  : 143093 KB (Current Server Up Count: 1)
Queue Route Mon Msg buffer usage  : 0 B
Update Generation in Progress     : No
Reset Walk in Progress            : No
IPv4 Unicast        
  Version                     : 42954698
  Init EOR Version            : 15416361
  Init EOR Pending count      : 0
  Update Generation 
    Last Run                   : Jul 29 06:15:26.593, Count 1620
    Walk Currently Stalled     : No, Last Stalled : Jul 29 04:38:04.837, Count 224
IPv6 Unicast        
  Version                     : 0
  Init EOR Version            : 0
  Init EOR Pending count      : 0
  Update Generation 
    Last Run                   : not set, Count 0
    Walk Currently Stalled     : No, Last Stalled : not set, Count 0

TCP: 
  Last message sent: Jul 29 06:15:30.993, Status: No Pending Data
  Last write pulse received: Jul 29 06:15:31.393, Waiting: FALSE

Message Stats:
Total msgs dropped   : 5372968
Total msgs pending   : 0, Max: 2070488 at Jul 29 04:25:08.541
Total messages sent  : 1471520
Total bytes sent     : 267883849, Time spent: 8.500 secs
           INITIATION: 3
          TERMINATION: 0
         STATS-REPORT: 0
    PER-PEER messages: 1471517

ROUTE-MON messages   : 1471512
   EOR messages      : 2
   Update messages   : 17680 (Prefixes: 18940950, Err: 0) 
   Withdraw messages : 72092 (Prefixes: 19232017, Err: 0) 
       Discarded msgs: 454 (reason : peer-down)
       Discarded pfx : 33658 (reason : peer-down)
Update gen time spent: 81.519 secs

  Neighbor 100.1.0.2
Messages pending: 0
Messages dropped: 5372968
Messages sent   : 1471517    <<<<<<
      PEER-UP   : 4
    PEER-DOWN   : 1
    ROUTE-MON   : 1471512
      EOR       : 2
      Update    : 17680 (Prefixes: 18940950, Err: 0) 
      Withdraw  : 72092 (Prefixes: 19232017, Err: 0)

OPENBMP

BMP server我们可以使用OPENBMP这个开源的项目，关于此项目可参考Github.

安装测试可以参考以下link，使用docker-compose 快速的搭建这个实例。

https://www.openbmp.org/getting_started.html

安装示例:

[root@localhost BMP]# pip install docker-compose
[root@localhost BMP]# wget https://raw.githubusercontent.com/OpenBMP/obmp-docker/main/docker-compose.yml 
[root@localhost BMP]# git clone https://github.com/OpenBMP/obmp-grafana.git
[root@localhost BMP]# mkdir -p /var/openbmp
[root@localhost BMP]# export OBMP_DATA_ROOT=/var/openbmp
[root@localhost BMP]# sudo mkdir -p $OBMP_DATA_ROOT
[root@localhost BMP]# sudo chmod -R 7777 $OBMP_DATA_ROOT
[root@localhost BMP]# mkdir -p ${OBMP_DATA_ROOT}/config
[root@localhost BMP]# mkdir -p ${OBMP_DATA_ROOT}/kafka-data
[root@localhost BMP]# mkdir -p ${OBMP_DATA_ROOT}/zk-data
[root@localhost BMP]# mkdir -p ${OBMP_DATA_ROOT}/zk-log
[root@localhost BMP]# mkdir -p ${OBMP_DATA_ROOT}/postgres/data
[root@localhost BMP]# mkdir -p ${OBMP_DATA_ROOT}/postgres/ts
[root@localhost BMP]# mkdir -p ${OBMP_DATA_ROOT}/grafana
[root@localhost BMP]# chmod -R 7777 $OBMP_DATA_ROOT/*
[root@localhost BMP]# cp -r obmp-grafana/dashboards obmp-grafana/provisioning ${OBMP_DATA_ROOT}/grafana/
[root@localhost BMP]# vim docker-compose.yml     <<<< 修改文件中MEM字段， 更改docker使用的memory为2G， 测试使用足够了
[root@localhost BMP]# OBMP_DATA_ROOT=/var/openbmp docker-compose -f ./docker-compose.yml -p obmp up -d   <<<
Creating obmp-zookeeper ... 
Creating obmp-grafana   ... 
Creating obmp-psql      ... 
Creating obmp-collector ... 
Creating obmp-psql-app  ... 
Creating obmp-kafka     ... 
[root@localhost BMP]#   docker ps
CONTAINER ID   IMAGE                             COMMAND                  CREATED              STATUS              PORTS                                                                                  NAMES
b4d4e3bd12d0   confluentinc/cp-kafka:6.0.2       "/etc/confluent/dock…"   About a minute ago   Up About a minute   0.0.0.0:9092->9092/tcp, :::9092->9092/tcp                                              obmp-kafka
8ebbe99a86d6   openbmp/psql-app:latest           "/usr/sbin/run"          2 minutes ago        Up About a minute   8080/tcp, 0.0.0.0:9005->9005/tcp, :::9005->9005/tcp                                    obmp-psql-app
a52de93a5645   openbmp/postgres:latest           "docker-entrypoint.s…"   2 minutes ago        Up About a minute   0.0.0.0:5432->5432/tcp, :::5432->5432/tcp                                              obmp-psql
a9866e9ef534   openbmp/collector:latest          "/usr/sbin/run"          2 minutes ago        Up About a minute   0.0.0.0:5000->5000/tcp, :::5000->5000/tcp                                              obmp-collector
a19cca96d0cc   grafana/grafana:latest            "/run.sh"                2 minutes ago        Up About a minute   0.0.0.0:3000->3000/tcp, :::3000->3000/tcp                                              obmp-grafana
b9402148e6ea   confluentinc/cp-zookeeper:6.0.2   "/etc/confluent/dock…"   2 minutes ago        Up About a minute   2181/tcp, 2888/tcp, 3888/tcp                                                           obmp-zookeeper
85a59886ecbe   portainer/portainer-ce            "/portainer"             5 weeks ago          Up 5 weeks          0.0.0.0:8000->8000/tcp, :::8000->8000/tcp, 0.0.0.0:9000->9000/tcp, :::9000->9000/tcp   portainer
[root@localhost BMP]# OBMP_DATA_ROOT=/var/openbmp docker-compose -p obmp down   <<<< stop and remove all containers

Router BMP配置

以Cisco IOS XR设备为例,OPENBMP默认开放的端口5000用于与client建立连接，端口3000为grafana

RP/0/RP0/CPU0:CRS-H#show run bmp                
Thu Jul 29 06:37:09.334 UTC
bmp server 1
 host 10.70.79.197 port 5000
 vrf calo-mgmt
 update-source MgmtEth0/RP0/CPU0/0
!

RP/0/RP0/CPU0:CRS-H#show run router bgp 65001
Thu Jul 29 06:37:22.173 UTC
router bgp 65001
 nsr
 bgp router-id 20.20.20.20
 bgp log neighbor changes detail
 address-family ipv4 unicast
  network 20.20.20.20/32
 !
 address-family ipv6 unicast
 !
 neighbor 100.1.0.2
  remote-as 100
  bmp-activate server 1     <<<< Active BMP for special peer 
  address-family ipv4 unicast
   route-policy pass in
   route-policy pass out
  !
RP/0/RP0/CPU0:CRS-H#show bgp  bmp summary 
Thu Jul 29 06:38:08.503 UTC
ID   Host                 Port     State   Time        NBRs
 1   10.70.79.197         5000     ESTAB   01:40:39    1

Adj-RIB-In and Adj-RIB-in Post-policy

如图，Adj-RIB-In为邻居发送过来的未经过rpl处理的路由信息，而Adj-RIB-in Post-policy则是经过RPL并且被处理过的路由信息。

默认IOS-XR设备是Adj-RIB-in pre policy, 即对通过入口策略前的路由（即设备从邻居收到的所有路由）进行监控。

如果希望监控服务器只对通过入口策略后的路由（即通过路由策略筛选后，实际下发到路由表中的路由）进行监控，使用以下配置:

RP/0/RP0/CPU0:CRS-H#show run bmp 
Thu Jul 29 06:53:19.792 UTC
bmp server all
 route-monitoring policy post inbound
!

BMP Packet

bmp_xuxing.zip

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