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Technical Announcement on Abnormal Disappearance of Static Cross-VPN Routes on H3C Routers and Switches

2022-04-18 09:41:21 Published
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Product Model

Router products:

CR16000-FA, CR16000-F, SR8800-X-S, SR8800-F, SR8800-X, RX8800, RA5100, RA5300 series routers

Switch products:

S12500R, S12500-X/S12500-F/S12500X-AF, S12500F-AF/S12500M-AF series, S12500R/S12500CR(V9) series switches

Involved Version

Product number

Involved version

CR16000-FCR16000-FSR8800-X-SSR8800-FSR8800-XRX8800

81xx branch: versions between E8125 (inclusive) and R8151P28 (inclusive), and versions between R8151P50 (inclusive) and R8151P58 (inclusive)

82xx branch: versions between E8216 (inclusive) and R8260P27 (inclusive), and versions between R8261P10 (inclusive) and R8261P22 (inclusive)

RA5100RA5300

Versions between R0107P17 (inclusive) and R7607P517 (inclusive)

S12500R

R3606, F3607, F3607P01, F3607P02 versions

S12500-X/S12500-F/S12500X-AF S12500F-AF/S12500M-AF Series

F2808, F2809 version

S12500R/S12500CRV9

E5201P01 version

Problem Description

When a static inter-VPN (including public) route is configured on the above device, if only the VPN instance (including public) is specified as the next hop and no specific next hop address is specified, deleting and creating an irrelevant VPN instance on the device will cause the device to fail. All static cross-VPN routes above disappear, for example:

[H3C] ip route-static vpn-instance vpn1 100.1.1.1 24 public // Configure a static inter-VPN route without specifying the next hop address

[H3C] display ip routing-table vpn-instance vpn1 100.1.1.0 24 // Check that the static VPN route is added to the table normally and takes effect

Destination/Mask   Proto   Pre Cost        NextHop         Interface 

0.0.0.0/32      Direct    0  0         127.0.0.1         InLoop0             

127.0.0.0/8     Direct    0  0         127.0.0.1         InLoop0 

100.1.1.0/24     Static   60  0          0.0.0.0         InLoop0

[H3C] undo ip vpn-instance ceshi1 // Randomly delete a VPN instance

[H3C] ip vpn-instance ceshi2 // Randomly create a new VPN instance

[H3C] display ip routing-table vpn-instance vpn1 // Check that the static route of 100.1.1.0/24 in VPN1 has disappeared

Destination/Mask   Proto   Pre Cost        NextHop         Interface           

0.0.0.0/32      Direct    0  0         127.0.0.1         InLoop0             

127.0.0.0/8     Direct    0  0         127.0.0.1         InLoop0

Cause Analysis

When the device has the above configuration and the above operations, due to poor code protection, cross-VPN static routes will disappear in the IP routing table, and service forwarding related to these static cross-VPN routes will be interrupted.

Workaround/Solutions

Workaround

1. When configuring static inter-VPN (including public) routes, the next hop must specify a specific IP address.

2. For the devices involved, do not add or delete VPNs before upgrading versions or installing patches.

Solutions

Install the patch or upgrade the version to solve the problem, and the patch and version number of the product involved in solving the problem are as follows:

Product number

problem-solving patch

problem-solving version

CR16000-FCR16000-FSR8800-X-SSR8800-FSR8800-XRX8800

R8261P22H52

R8151P13H52

R8261P26 and later versions

R8151P29 and later versions

RA5100RA5300

/

R7607P518 and later

S12500R

/

F3608

S12500-X/S12500-F/S12500X-AF S12500F-AF/S12500M-AF Series

/

R2820

S12500R/S12500CRV9

/

E5201P02

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