上一篇帖子超长了。。。。。。。。
Summary检查：
本设备发布的所有信息可以使用以下命令检查：
R1#show mpls traffic-eng link-management advertisements
Flooding Status: ready
Configured Areas: 2 <<<<<<<<<<<<<<<配置的IGP数量
IGP Area[1] ID:: ospf 1 area 0 <<<<<<<<<通过OSPF发布到Area 0 区域
System Information::
Flooding Protocol: OSPF <<<<<<<<<发布的IGP协议
Header Information::
IGP System ID: 10.0.0.1 <<<<<<<<配置的IGP协议的ID
MPLS TE Router ID: 10.0.0.1 <<<<<<<<
Flooded Links: 2 <<<<<<<<在IGP中宣告的接口数量
Link ID:: 0 (GigabitEthernet1) <<<<<<<
Link Subnet Type: Point-to-Point <<<<
Link IP Address: 10.0.12.1 <<<<<<
Neighbor: ID 10.0.0.2, IP 10.0.12.2 <<<<<接口对端设备的IGP的Router-ID和IP地址
TE metric: 5 <<<<<<
IGP metric: 1 <<<<<<
SRLGs: None <<<<<<<配置的SRLG值
Physical Bandwidth: 1000000 kbits/sec
Res. Global BW: 750000 kbits/sec
Res. Sub BW: 0 kbits/sec
Downstream::
Global Pool Sub Pool
----------- ----------
Reservable Bandwidth[0]: 750000 0 kbits/sec
Reservable Bandwidth[1]: 750000 0 kbits/sec
Reservable Bandwidth[2]: 750000 0 kbits/sec
Reservable Bandwidth[3]: 750000 0 kbits/sec
Reservable Bandwidth[4]: 750000 0 kbits/sec
Reservable Bandwidth[5]: 750000 0 kbits/sec
Reservable Bandwidth[6]: 750000 0 kbits/sec
Reservable Bandwidth[7]: 650000 0 kbits/sec
Attribute Flags: 0x00000000
Link ID:: 1 (GigabitEthernet2)
Link Subnet Type: Broadcast
Link IP Address: 10.0.15.1
Designated Router: 10.0.15.1
TE metric: 1
IGP metric: 1
SRLGs: None
Physical Bandwidth: 1000000 kbits/sec
Res. Global BW: 800000 kbits/sec
Res. Sub BW: 0 kbits/sec
Downstream::
Global Pool Sub Pool
----------- ----------
Reservable Bandwidth[0]: 800000 0 kbits/sec
Reservable Bandwidth[1]: 800000 0 kbits/sec
Reservable Bandwidth[2]: 800000 0 kbits/sec
Reservable Bandwidth[3]: 800000 0 kbits/sec
Reservable Bandwidth[4]: 800000 0 kbits/sec
Reservable Bandwidth[5]: 800000 0 kbits/sec
Reservable Bandwidth[6]: 800000 0 kbits/sec
Reservable Bandwidth[7]: 700000 0 kbits/sec
Attribute Flags: 0x00000000
IGP Area[2] ID:: isis level-2
System Information::
Flooding Protocol: ISIS
Header Information::
IGP System ID: 0000.0000.0001.00
MPLS TE Router ID: 10.0.0.1
Flooded Links: 2
Link ID:: 0 (GigabitEthernet1)
Link Subnet Type: Point-to-Point
Link IP Address: 10.0.12.1
Neighbor: ID 0000.0000.0002.00, IP 10.0.12.2
TE metric: 5
IGP metric: 1
SRLGs: None
Physical Bandwidth: 1000000 kbits/sec
Res. Global BW: 750000 kbits/sec
Res. Sub BW: 0 kbits/sec
Downstream::
Global Pool Sub Pool
----------- ----------
Reservable Bandwidth[0]: 750000 0 kbits/sec
Reservable Bandwidth[1]: 750000 0 kbits/sec
Reservable Bandwidth[2]: 750000 0 kbits/sec
Reservable Bandwidth[3]: 750000 0 kbits/sec
Reservable Bandwidth[4]: 750000 0 kbits/sec
Reservable Bandwidth[5]: 750000 0 kbits/sec
Reservable Bandwidth[6]: 750000 0 kbits/sec
Reservable Bandwidth[7]: 650000 0 kbits/sec
Attribute Flags: 0x00000000
Link ID:: 1 (GigabitEthernet2)
Link Subnet Type: Broadcast
Link IP Address: 10.0.15.1
Designated Router: 0000.0000.0005.00, IP 10.0.15.5
TE metric: 1
IGP metric: 1
SRLGs: None
Physical Bandwidth: 1000000 kbits/sec
Res. Global BW: 800000 kbits/sec
Res. Sub BW: 0 kbits/sec
Downstream::
Global Pool Sub Pool
----------- ----------
Reservable Bandwidth[0]: 800000 0 kbits/sec
Reservable Bandwidth[1]: 800000 0 kbits/sec
Reservable Bandwidth[2]: 800000 0 kbits/sec
Reservable Bandwidth[3]: 800000 0 kbits/sec
Reservable Bandwidth[4]: 800000 0 kbits/sec
Reservable Bandwidth[5]: 800000 0 kbits/sec
Reservable Bandwidth[6]: 800000 0 kbits/sec
Reservable Bandwidth[7]: 700000 0 kbits/sec
Attribute Flags: 0x00000000
R1#
信息发布的时间
在IGP中有三种情况下对链路信息进行泛洪
一，当链路生效或失效时（go up or down）
二，当链路配置发生变化时（例如，链路代价得到更新）
三，当到达周期性对路由器的IGP信息进行泛洪的时候。
MPLS TE中增加了另外一条进行泛洪的原因----当链路带宽发生重大变化的时候进行泛洪。
当接口上的隧道建立或者拆除时，接口上的可用带宽总量随着经过接口的可保留带宽发生了变化。当经过接口的隧道建立时，隧道消耗了带宽，可用带宽的总量减少，而隧道拆除时，可用带宽的总量增加。
如果有变化就泛洪，有可能会导致泛洪信息量过于巨大----导致网络带宽耗尽，CPU资源也耗尽。
网络如果没有及时同步可能会导致建立失败和其他问题。
所以考虑到什么时候对变化进行泛洪。有三条泛洪阈值的规则：
1，对重大变化立即进行泛洪。
2，对不重要的变化周期性泛洪，但是比IGP刷新频率更高。
3，如果一个没有泛洪的变化导致了错误，马上进行泛洪。
-------------------
对重大变化立即进行泛洪：
重大变化被定义为链路带宽的百分比。
也许对一个方向的变化比另一个方向的变化更关注。两个方向：分配和回收。
对不同的网络、不同的情况和不同的链路，发布可用带宽的规则有所不同。所以cisco IOS软件不仅建立了一组合理的默认值，而且还有一套用来确定什么变化时的重大的复杂配置。
1， 重大变化的阈值可以通过以下命令查看：
R1#show mpls traffic-eng link-management bandwidth-allocation
System Information::
Links Count: 2
Bandwidth Hold Time: max. 15 seconds
Link ID:: Gi1 (10.0.12.1)
Local Intfc ID: 1
Link Status:
SRLGs: None
Intfc Switching Capability Descriptors:
Default: Intfc Switching Cap psc1, Encoding ethernet
Link Label Type: Packet
Physical Bandwidth: 1000000 kbits/sec
Max Res Global BW: 750000 kbits/sec (reserved: 0% in, 13% out)
Max Res Sub BW: 0 kbits/sec (reserved: 100% in, 100% out)
BW Descriptors: 1
MPLS TE Link State: MPLS TE on, RSVP on, admin-up, flooded, allocated
Inbound Admission: reject-huge
Outbound Admission: allow-if-room
Link MTU: IP 1500, MPLS 1500
Admin. Weight: 5 (configured)
IGP Neighbor Count: 2
Up Thresholds: 15 30 45 60 75 80 85 90 95 96 97 98 99 100 (default)
Down Thresholds: 100 99 98 97 96 95 90 85 80 75 60 45 30 15 (default)
Downstream Global Pool Bandwidth Information (kbits/sec):
KEEP PRIORITY BW HELD BW TOTAL HELD BW LOCKED BW TOTAL LOCKED
0 0 0 0 0
1 0 0 0 0
2 0 0 0 0
3 0 0 0 0
4 0 0 0 0
5 0 0 0 0
6 0 0 0 0
7 0 0 100000 100000
Downstream Sub Pool Bandwidth Information (kbits/sec):
KEEP PRIORITY BW HELD BW TOTAL HELD BW LOCKED BW TOTAL LOCKED
0 0 0 0 0
1 0 0 0 0
2 0 0 0 0
3 0 0 0 0
4 0 0 0 0
5 0 0 0 0
6 0 0 0 0
7 0 0 0 0
接口阈值最多16个，通过以下命令可以修改默认阈值。后面最多可以设置16个阈值。
R1(config-if)#mpls traffic-eng flooding thresholds up 1 10 20 30
每次超过阈值时会立即发送LSP或者LSA进行泛洪。
2，MPLS TE默认泛洪比IGP更为频繁。
在IOS-XE中默认每60秒进行泛洪，可以通过以下命令查看。
R1#show mpls traffic-eng link-management summary
System Information::
Links Count: 2
Flooding System: enabled
IGP Area ID:: ospf 1 area 0
Flooding Protocol: OSPF
Flooding Status: data flooded
Periodic Flooding: enabled (every 60 seconds, next in 22 seconds)
Flooded Links: 2
IGP System ID: 10.0.0.1
MPLS TE Router ID: 10.0.0.1
Neighbors: 4
IGP Area ID:: isis level-2
Flooding Protocol: ISIS
Flooding Status: data flooded
Periodic Flooding: enabled (every 60 seconds, next in 22 seconds)
Flooded Links: 2
IGP System ID: 0000.0000.0001.00
MPLS TE Router ID: 10.0.0.1
Neighbors: 4
可以通过以下命令进行修改MPLS TE的泛洪时间。仅本地有效。
R1(config)#mpls traffic-eng link-management timers periodic-flooding 30
R1#show mpls traffic-eng link-management summary
System Information::
Links Count: 2
Flooding System: enabled
IGP Area ID:: ospf 1 area 0
Flooding Protocol: OSPF
Flooding Status: data flooded
Periodic Flooding: enabled (every 30 seconds, next in 19 seconds)
Flooded Links: 2
IGP System ID: 10.0.0.1
MPLS TE Router ID: 10.0.0.1
Neighbors: 4
IGP Area ID:: isis level-2
Flooding Protocol: ISIS
Flooding Status: data flooded
Periodic Flooding: enabled (every 30 seconds, next in 19 seconds)
Flooded Links: 2
IGP System ID: 0000.0000.0001.00
MPLS TE Router ID: 10.0.0.1
Neighbors: 4
3，没有泛洪的带宽导致错误时，立即进行泛洪
例如：接口的阈值为25% 50% 90%，接口的最大可保留带宽为100M。
当一个隧道申请预留30M进行建立，建立后，链路的阈值超过25%的阈值，将立即进行泛洪。泛洪剩余带宽70M
后又进行第二个隧道申请预留10M，隧道建立成功后链路剩余可以带宽为60M，并没有超过阈值50%，将不进行立即通告，默认最大等待60S后进行通告链路剩余带宽。
在通告之前，第三个隧道申请预留65M，当RSVP 的path消息到达设备，设备的最大可用带宽为60M，不满足要求，将返回给隧道头端路由Error消息，并立即进行泛洪。
IOS-XR中MPLS TE中配置案例
!
router isis TE
is-type level-2-only
net 49.0000.0000.0005.00
address-family ipv4 unicast
metric-style wide
mpls traffic-eng level-2-only
mpls traffic-eng router-id Loopback0
!
interface Loopback0
address-family ipv4 unicast
!
!
interface GigabitEthernet0/0/0/0
point-to-point
address-family ipv4 unicast
!
!
interface GigabitEthernet0/0/0/1
point-to-point
address-family ipv4 unicast
!
!
interface GigabitEthernet0/0/0/2
point-to-point
address-family ipv4 unicast
!
!
!
router ospf TE
address-family ipv4 unicast
area 0
mpls traffic-eng
interface GigabitEthernet0/0/0/0
!
!
mpls traffic-eng router-id Loopback0
!
rsvp
interface GigabitEthernet0/0/0/0
bandwidth percentage 80
!
interface GigabitEthernet0/0/0/1
bandwidth percentage 80
!
interface GigabitEthernet0/0/0/2
bandwidth percentage 80
!
!
mpls traffic-eng
interface GigabitEthernet0/0/0/0
admin-weight 15
flooding thresholds up 10 20 30 40 50 60 70 80 90
!
interface GigabitEthernet0/0/0/1
!
interface GigabitEthernet0/0/0/2
attribute-flags 0x11
!
link-management timers periodic-flooding 30
!
mpls label range table 0 50000 59999
end
