How can DMVPN can make some QOS per spoke ?
It is what we will configure today :
Here is the network :
I will not explain how NHRP works in detail here.
R1, R2, R3, R4 use IS-IS (for fun) as IGP.
router isis net 49.MAC_ADD.00 interface etc x/y ip router isis
Now, here it comes DMVPN configurations :
R4#show run int tun 0 Building configuration... Current configuration : 351 bytes ! interface Tunnel0 bandwidth 1000 ip address 77.0.0.4 255.255.255.0 no ip redirects ip nhrp authentication 1111 ip nhrp map multicast dynamic ip nhrp map group toto service-policy output pm ip nhrp network-id 1111 ip nhrp redirect load-interval 30 qos pre-classify tunnel source Loopback0 tunnel mode gre multipoint tunnel key 1111 end R4#
And for R3 :
R3#show run int tun 0 Building configuration... Current configuration : 340 bytes ! interface Tunnel0 ip address 77.0.0.3 255.255.255.0 no ip redirects ip nhrp authentication 1111 ip nhrp group toto ip nhrp map 77.0.0.4 4.4.4.4 ip nhrp map multicast 4.4.4.4 ip nhrp network-id 1111 ip nhrp nhs 77.0.0.4 ip nhrp shortcut qos pre-classify tunnel source Loopback0 tunnel mode gre multipoint tunnel key 1111 end R3#
!!! WARNING !!! ‘ip nhrp group’ and ‘ip nhrp map group xxx service-policy output yyy’ commands are not displayed with ‘?’. But the correct way is ‘nhrp group xxx’ and ‘nhrp map group xxx service-policy out pm’.
The mapping of the policy-map on the multipoint tunnel is done when the NHRP request is sent (on the spoke we flag it by means of ‘ip nhrp group toto’). Some extra fields in the NHRP packet show that ‘this’ kind of trafic through this IP must be grouped with ‘this’ spoke.
We can see the mapping by :
4#show dmvpn detail
Legend: Attrb --> S - Static, D - Dynamic, I - Incomplete
N - NATed, L - Local, X - No Socket
# Ent --> Number of NHRP entries with same NBMA peer
NHS Status: E --> Expecting Replies, R --> Responding, W --> Waiting
UpDn Time --> Up or Down Time for a Tunnel
==========================================================================
Interface Tunnel0 is up/up, Addr. is 77.0.0.4, VRF ""
Tunnel Src./Dest. addr: 4.4.4.4/MGRE, Tunnel VRF ""
Protocol/Transport: "multi-GRE/IP", Protect ""
Interface State Control: Disabled
nhrp event-publisher : Disabled
Type:Hub, Total NBMA Peers (v4/v6): 2
# Ent Peer NBMA Addr Peer Tunnel Add State UpDn Tm Attrb Target Network
----- --------------- --------------- ----- -------- ----- -----------------
1 2.2.2.2 77.0.0.2 UP 09:21:51 D 77.0.0.2/32
1 3.3.3.3 77.0.0.3 UP 09:22:34 D 77.0.0.3/32
NHRP group: toto
Output QoS service-policy applied: pm
Crypto Session Details:
--------------------------------------------------------------------------------
Pending DMVPN Sessions:
R4#
And we can see statistics by this command :
R4#show policy-map multipoint Tunnel 0 3.3.3.3
Interface Tunnel0 3.3.3.3
Service-policy output: pm
Class-map: class-default (match-any)
8 packets, 1061 bytes
30 second offered rate 0000 bps, drop rate 0000 bps
Match: any
R4#