mpls ldp binding filetering

初期設定

全I/FにてOSPFとLDPを起動

iosv-4#sh mpls ldp bindings neighbor 3.3.3.3
  lib entry: 1.1.1.1/32, rev 17
        remote binding: lsr: 3.3.3.3:0, label: 20
  lib entry: 2.2.2.2/32, rev 19
        remote binding: lsr: 3.3.3.3:0, label: 21
  lib entry: 3.3.3.3/32, rev 20
        remote binding: lsr: 3.3.3.3:0, label: exp-null
  lib entry: 4.4.4.4/32, rev 13
        remote binding: lsr: 3.3.3.3:0, label: 18
  lib entry: 10.10.10.10/32, rev 15
        remote binding: lsr: 3.3.3.3:0, label: 19
  lib entry: 172.16.1.0/24, rev 2
        remote binding: lsr: 3.3.3.3:0, label: exp-null
  lib entry: 192.168.0.0/24, rev 8
        remote binding: lsr: 3.3.3.3:0, label: exp-null
  lib entry: 192.168.1.0/24, rev 4
        remote binding: lsr: 3.3.3.3:0, label: 16
  lib entry: 192.168.2.0/24, rev 6
        remote binding: lsr: 3.3.3.3:0, label: 17
  lib entry: 192.168.10.0/24, rev 10
        remote binding: lsr: 3.3.3.3:0, label: exp-null

めっちゃラベルを受け取ってる。
PEルータは対向PEのLSPさえ知っていれば十分なのに、mpls ipが設定されてしまっているせいで余分にラベルを受け取ってしまう。結果、CPUへの負荷が上昇してしまう。

mpls ldp neighbor labels accept X

iosv-4(config)#access-list 1 permit 172.16.1.0 0.0.0.255
iosv-4(config)#mpls ldp neighbor 3.3.3.3 labels accept 1
iosv-4(config)#end

iosv-4#sh mpls ldp bindings neighbor 3.3.3.3
  lib entry: 172.16.1.0/24, rev 2
        remote binding: lsr: 3.3.3.3:0, label: exp-null

め～ちゃ～く～ちゃ～すっきりした。

show mpls ldp neighbor detail

iosv-4#sh mpls ldp neighbor 3.3.3.3 detail
Peer LDP Ident: 3.3.3.3:0; Local LDP Ident 4.4.4.4:0
TCP connection: 3.3.3.3.646 - 4.4.4.4.31275
Password: not required, none, in use
State: Oper; Msgs sent/rcvd: 16/17; Downstream; Last TIB rev sent 20
Up time: 00:03:30; UID: 13; Peer Id 0;
LDP discovery sources:
GigabitEthernet0/0; Src IP addr: 172.16.1.1
holdtime: 15000 ms, hello interval: 5000 ms
Addresses bound to peer LDP Ident:
192.168.0.10    172.16.1.1      192.168.10.1    3.3.3.3
Peer holdtime: 180000 ms; KA interval: 60000 ms; Peer state: estab
LDP inbound filtering accept acl: 1
Capabilities Sent:
[Dynamic Announcement (0x0506)]
[Typed Wildcard (0x050B)]
Capabilities Received:
[Dynamic Announcement (0x0506)]
[Typed Wildcard (0x050B)]

"LDP inbound filtering accept acl: 1"