RTP header compression ON ASR 903 IOS XE 17

[shaileshtata1]

Hi All , 

We have configured IP rtp compression on E1 link but the packets are not getting compressed. If anyone has any clue , kindly advise.

Although IP header compression is ON although RTP packets are coming on interface still we are not receiving any detection of RTP header com

TAS01-ASR903#sh ip rtp header-compression
RTP/UDP/IP header compression statistics:
Interface Serial0/2/5.1 (compression on, IPHC)
Distributed fast switched:
66 seconds since line card sent last stats update
Rcvd: 0 total, 0 compressed, 0 errors, 0 status msgs
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed, 0 status msgs, 0 not predicted
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots,
0 misses, 0 collisions, 0 negative cache hits, 0 free contexts
 

[M02@rt37]

Hello @shaileshtata1 

Both ends must be configured to support and negotiate RTP header compression. Is it Ok ?

[shaileshtata1]

This comes up only when 

Interface Serial0/2/5.1 (compression on, IPHC).

What are the commands required for this . I have just used ip rtp header-compression iphc-format in the interface 

negotiation is complete.

[M02@rt37]

 @shaileshtata1 

do 

Router# debug ip rtp header-compression

and share output please. 

[shaileshtata1]

Please find below 

debug ip rtp header-compression Output

Log Buffer (4096 bytes):
*Dec 26 08:05:03.498: TCP Space : 16 NON_TCP Space : 16
*Dec 26 08:05:03.499: IPHC Configured
*Dec 26 08:05:03.499: Flavour : IPHC Passive : FALSE
*Dec 26 08:05:03.499: Max Period : 256 Max Time : 5 Max Header : 168
*Dec 26 08:05:03.499: Feedback : On Refresh : Off
*Dec 26 08:05:03.499: TCP : On NON_TCP : On RTP : On
*Dec 26 08:05:03.499: TCP Space : 16 NON_TCP Space : 16
*Dec 26 08:05:03.499: IPHC Negotiated
*Dec 26 08:05:03.499: Flavour : IPHC Passive : FALSE
*Dec 26 08:05:03.500: Max Period : 256 Max Time : 5 Max Header : 168
*Dec 26 08:05:03.500: Feedback : On Refresh : Off
*Dec 26 08:05:03.500: TCP : Off NON_TCP : Off RTP : On
*Dec 26 08:05:03.500: TCP Space : 16 NON_TCP Space : 16
*Dec 26 08:05:04.194: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/2/5.1, changed state to down
*Dec 26 08:07:00.195: %LINK-3-UPDOWN: Interface Serial0/2/5.1, changed state to up
*Dec 26 08:07:00.221: IPHC Configured
*Dec 26 08:07:00.221: Flavour : IPHC Passive : FALSE
*Dec 26 08:07:00.221: Max Period : 256 Max Time : 5 Max Header : 168
*Dec 26 08:07:00.221: Feedback : On Refresh : Off
*Dec 26 08:07:00.221: TCP : On NON_TCP : On RTP : On
*Dec 26 08:07:00.221: TCP Space : 16 NON_TCP Space : 16
*Dec 26 08:07:00.222: IPHC Negotiated
*Dec 26 08:07:00.222: Flavour : IPHC Passive : FALSE
*Dec 26 08:07:00.222: Max Period : 256 Max Time : 5 Max Header : 168
*Dec 26 08:07:00.222: Feedback : On Refresh : Off
*Dec 26 08:07:00.222: TCP : Off NON_TCP : Off RTP : On
*Dec 26 08:07:00.223: TCP Space : 16 NON_TCP Space : 16
*Dec 26 08:07:00.251: IPHC Configured
*Dec 26 08:07:00.251: Flavour : IPHC Passive : FALSE
*Dec 26 08:07:00.252: Max Period : 256 Max Time : 5 Max Header : 168
*Dec 26 08:07:00.252: Feedback : On Refresh : Off
*Dec 26 08:07:00.252: TCP : On NON_TCP : On RTP : On
*Dec 26 08:07:00.252: TCP Space : 16 NON_TCP Space : 16
*Dec 26 08:07:00.252: IPHC Negotiated
*Dec 26 08:07:00.252: Flavour : IPHC Passive : FALSE
*Dec 26 08:07:00.252: Max Period : 256 Max Time : 5 Max Header : 168
*Dec 26 08:07:00.252: Feedback : On Refresh : Off
*Dec 26 08:07:00.252: TCP : On NON_TCP : On RTP : On
*Dec 26 08:07:00.252: TCP Space : 16 NON_TCP Space : 16
*Dec 26 08:07:00.920: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/2/5.1, changed state to up
*Dec 26 08:07:01.015: %OSPF-5-ADJCHG: Process 2, Nbr 1.1.1.1 on Serial0/2/5.1 from LOADING to FULL, Loading Done
*Dec 26 08:09:39.231: %SYS-5-CONFIG_I: Configured from console by console
*Dec 26 08:10:45.418: %SYS-5-CONFIG_I: Configured from console by console
*Dec 26 08:18:45.153: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/3, changed state to down
*Dec 26 08:18:45.155: %IOSXE_RP_ALARM-6-INFO: asserted CRITICAL GigabitEthernet0/0/3: Physical Port Link Down
*Dec 26 08:18:45.172: %LINK-3-UPDOWN: Interface BDI3, changed state to down
*Dec 26 08:18:45.852: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down
*Dec 26 08:18:45.873: %LINEPROTO-5-UPDOWN: Line protocol on Interface BDI3, changed state to down
*Dec 26 08:23:04.156: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/3, changed state to up
*Dec 26 08:23:04.157: %IOSXE_RP_ALARM-6-INFO: cleared CRITICAL GigabitEthernet0/0/3: Physical Port Link Down
*Dec 26 08:23:04.177: %LINK-3-UPDOWN: Interface BDI3, changed state to up
*Dec 26 08:23:04.855: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to up
*Dec 26 08:23:04.875: %LINEPROTO-5-UPDOWN: Line protocol on Interface BDI3, changed state to up
TAS03-ASR903#

[MHM Cisco World]

Are you use frame relay since I see interface p2mp?

Did you config rtp in both end ?

MHM

[shaileshtata1]

It is Serial E1 interface with PPP encapsulation 

Yes RTP is configured at both the ends. 

[MHM Cisco World]

Interface Serial0/2/5.1 <<- why you use this 

[shaileshtata1]

This is how e1 serial interfaces are configured in ASR903.

PFB the detailed setup and configuration:

[shaileshtata1]

This is how e1 serial interfaces are configured in ASR903.

Detailed setup and configuration are attached for your reference :