Nexthop Forwarding Support IPv4/v6 Address

Revision History


Note

Revision history details are not provided for features introduced before release 21.24.

Revision Details

Release

First introduced

Pre 21.24

Feature Description

In uplink direction at CUPS UPF, UE IP and the GI IP might be in a different subnet and the routing path is defined to allow the uplink packet forward accordingly.

How It Works

Architecture

The following illustration provides EGCI-based P-GW UP Selection Solution overview.

Figure 1. Nexthop Forwarding

Configuration Priority

Configuration

Priority

AAA (Only IPv4)

1

APN (Gn/VAPN)

2

IP Pool

3

Configuration Use Cases

Case

IP Type

AAA

APN

IP Pool

Nexthop IP Selection

Nexthop supplied Only in AA message over AAA

IPv4

209.165.200.225

Not configured

Not configured

Nexthop Address Selected from AAA: IPv4: 209.165.200.225 IPv6: NA

IPv6

Not supported

Not configured

Not configured

Nexthop that is supplied in AA message over AAA + IPv4 configured in APN and IP Pool

IPv4

209.165.200.225

209.165.201.1

50.50.50.50

Nexthop Address is selected from AAA: IPv4: 209.165.200.225 IPv6: NA

IPv46

Not supported

Not configured

Not configured

IPv4 and IPv6 configured in APN only

IPv4

Not configured

209.165.201.1

Not configured

Nexthop Address is selected from APN: IPv4: 209.165.200.225 IPv6: 9001::3

IPv6

Not supported

9001::3

Not configured

IPv4 and IPv6 configured in IP Pool only

IPv4

Not configured

Not configured

50.50.50.50.

Nexthop Address is selected from IP Pool: IPv4: 209.165.200.225 IPv6 : 5002::5

IPv6

Not configured

Not configured

5002::5

IPv4 available over AAA + IPv4 and IPv6 configure on APN and IP Pool

IPv4

209.165.200.225

209.165.201.1

50.50.50.50

Nexthop IPv4 is selected from AAA: 209.165.200.225 Nexthop IPv6 selected from APN : 9001::3

IPv6

Not Supported

9001::3

5002::5

IPv4 available over AAA + IPv4 and IPv6 configure on IP Pool

IPv4

209.165.200.225

Not configured

50.50.50.50

Nexthop IPv4 is selected from AAA: 209.165.200.225 Nexthop IPv6 selected from IP Pool: 5002::5

IPv6

Not Supported

Not configured

5002::5

IPv4 available over AAA + IPv4 and IPv6 configure on APN.

IPv4

209.165.200.225

209.165.201.1

Not configured

Nexthop IPv4 is selected from AAA: 209.165.200.225 Nexthop IPv6 selected from APN: 9001::3

IPv6

Not Supported

9001::3

Not configured

Interface

Following Private IEs are introduced in SX Session Establishment message.

2

3

8

PFCP _IE_ NEXT

HOP

PFCP_IE_NEXTHOP

Sx Session Establish

ment Request

Private IE : CUPS: nexthop forward

ing support- IPv4 /IPv6 address

BITS

Octets

7

6

5

4

3

2

1

1 to 2

Type = 238 (decimal)

3 to 4

Length = n

5 to 10

PFCP_IE_NEXTHOP_ID

11-14

PFCP_IE_NEXTHOP_IP

2

3

9

PFCP _IE_ NEXTHOP _ID

PFCP_IE_NEXTHOP_ID

1. Inside create far IE of Sx Session Establishment Request

Private IE : CUPS: nexthop forwarding support- IPv4 /IPv6 address

BITS

2. Inside PFCP _IE_ NEXTHOP IE of Sx Session Establishment Request

Octets

7

6

5

4

3

2

1

PFCP _IE_ NEXTHOP of Sx Session Establishment Request

1 to 2

Type = 239 (decimal)

3 to 4

Length = 5

5 to 10

2

4

0

PFCP_IE_ NEXTHOP _IP

PFCP_IE_NEXTHOP_IP

Bits

PFCP_IE_ NEXTHOP of Sx Session Establishment Request

Private IE : CUPS: nexthop forwarding support- IPv4/ IPv6 address

Octets

7

6

5

4

3

2

1

1 to 2

Type = 240 (decimal)

3 to 4

Length = n

5

spare

V4

V6

m to m+3

IPv4 Address

p to p+15

IPv6 Address

Configuring Nexthop Forwarding Support IPv4/IPv6 Address

Configuring Nexthop Forwarding at APN Configuration Mode

Use the following CLI commands to configure Nexthop Forwarding at APN.

configure 
   context context_name 
      apn apn_name 
         nexthop-forwarding-address { ipv4v6_address | ipv4_address | ipv6_address } 
         no nexthop-forwarding-address 
         end

NOTES:

  • no : Disables Nexthop forwarding address configuration.

  • nexthop-forwarding-address { ipv4v6_address | ipv4_address | ipv6_address } : Configures the Nexthop forwarding address for this APN.

    • ipv4_address Configures IPv4 address.

    • ipv6_address Configures IPv6 address (supports colon-separated hexadecimal notation).

Configuring Nexthop Forwarding at IP Pool

Use the following CLI commands to configure Nexthop Forwarding at APN.

configure 
   context context_name 
       [ no ] ip pool ipv4-public nexthop-forwarding-address  ipv4_address 
       [ no ] ip pool ipv6-public nexthop-forwarding-address  ipv6_address 
       end

NOTES:

  • no : Disables Nexthop forwarding address configuration.

  • nexthop-forwarding-address ipv4_address | ipv6_address : Configures the IPv4 address Nexthop forwarding address for this pool.

  • nexthop-forwarding-address ipv6_address : Configures the IPv6 address Nexthop forwarding address for this pool.

Configuring Nexthop Forwarding Through AAA

Nexthop Forwarding Address can be configured through AAA. This option allows us to configure externally.

Configuring Nexthop Forwarding externally:
RADIUS AUTHENTICATION
  Access-Accept
   Subscriber-Nexthop-Address

Monitoring and Troubleshooting

This section provides information about CLI commands available for monitoring and troubleshooting the feature.

Show Commands and Outputs

This section provides information about show commands and their outputs in support of this feature.

show apn name <apn_name>

The output of this show command is enhanced to include the following fields introduced in support of this feature.

  • nexthop gateway addr: Displays the configured Nexthop gateway address.

show subscriber user-plane-only full all

The output of this show command is enhanced to include the following fields introduced in support of this feature.

  • Next Hop Ip Address - Displays the configured Nexthop IP address.