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AR Router Maintenance Guide-FAQ(Reliability)

Latest reply: Aug 30, 2017 06:33:18 1431 1 0 0 0

Hello everyone,

Today I will share with you some FAQs of Reliability.

2.14  Reliability

2.14.1  What Modes Can Interfaces Be Backed up?

Interface backup supports the master/slave and load balancing backup mode. From V200R001C01, interface backup supports the following association modes: association between interface backup and NQA, interface backup and BFD, and interface backup and routing.

2.14.2  What Are the Types of Primary and Backup Interfaces Supported by Interface Backup?

Primary interfaces: Ethernet Layer 3 interface and subinterface, dialer interface, ATM interface, ISDN BRI interface, Async interface, a cellular interface, PON interface, MP-group interface, MFR interface, FR subinterface, and serial interface and subinterface.

Backup interfaces: Ethernet Layer 3 interface and subinterface, dialer interface, ATM interface, BRI interface, Async interface, a cellular interface, MP-group interface, MFR interface, and subinterface, and serial interface and subinterface.

On the AR100&AR120&AR150&AR160&AR200 device, primary and backup interfaces cannot be ISDN BRI interfaces, PON interfaces, or Async interfaces.

2.14.3  Can Physical Interfaces Be Configured as Monitored Interfaces of a VRRP Group?

Yes.

2.14.4  How Is a VRRP Virtual MAC Address Calculated?

A virtual MAC address is generated by the virtual router based on the virtual router ID. The virtual MAC address format is 00-00-5E-00-01-{VRID} (VRRP) and 00-00-5E-00-02-{VRID} (VRRP6).

2.14.5  What Interfaces Are Provided on the AR That Supports VRRP?

Interfaces that support VRRP include the Layer 3 Ethernet interface, VLANIF interface, Layer 3 Eth-Trunk interface, Ethernet subinterface, and Eth-Trunk subinterface.

2.14.6  Does VRRP Support Authentication?

VRRPv2 supports authentication in simple text mode and MD5 mode. VRRPv3 does not support authentication.

2.14.7  Why Have I Failed to Configure the Priority 255 of a Router in a VRRP Backup Group?

In a VRRP backup group, the priority of 255 is reserved for the IP address owner and cannot be manually configured.

2.14.8  How Do I Distinguish a Single-Hop BFD Session and a Multi-Hop BFD Session?

Static BFD sessions: When the session is created for the first time, a single-hop BFD session is bound to a local interface while a multi-hop session is not.

Dynamic BFD sessions: Query the routes to determine whether a BFD session is a single-hop session or a multi-hop session. BFD for Internal Border Gateway Protocol (IBGP) sessions are multi-hop sessions.

2.14.9  What Do the TTL Values 255, 254, and 253 Mean in a BFD Session?

The TTL values 255, 254, and 253 indicate that the lifetime of a BFD packet is 255, 254, and 253 respectively.

From V200R001C01, you can configure a global TTL for a BFD session.

By default, the lifetime of a static single-hop or dynamic single-hop BFD packet is 255, the lifetime of a static multi-hop BFD packet is 254, and the lifetime of a dynamic multi-hop BFD packet is 253.

2.14.10  How Do I Change the Local and Remote Discriminators of a BFD Session?

Once configured, the local and remote discriminators of a Bidirectional Forwarding Detection (BFD) session cannot be changed. If you have to change the local and remote discriminators of a BFD session, delete the BFD session and reconfigure the BFD session.

2.14.11  Which Interfaces Can I Configure a BFD Session On?

In V200R001C00, only Ethernet interfaces support BFD sessions.

In V200R001C01 and later versions, the following interfaces support common BFD sessions:
  • Physical interfaces: Layer 3 Ethernet interfaces, serial interfaces (including synchronous SA interfaces, E1/T1 interfaces, CE1/CT1/PRI interfaces, CE3 interfaces, and CPOS interfaces), POS interfaces, ATM interfaces (including ADSL interfaces, VDSL interfaces, E1-IMA interfaces, and G.SHDSL interfaces).

  • Logical interfaces: Ethernet sub-interfaces (including Dot1q sub-interfaces and QinQ sub-interfaces), dialer interfaces, VLANIF interfaces, Layer 3 Eth-Trunks, IP-Trunk interfaces, MP-Group interfaces, MFR interfaces, IMA-group interfaces, serial sub-interfaces, channelized serial sub-interfaces, IMA-group sub-interfaces, POS sub-interfaces, ATM sub-interfaces, MFR sub-interfaces, and Eth-Trunk sub-interfaces (Dot1q sub-interfaces).

    6711c418de1945a6a6d6c41745fe9374 NOTE:

    When a physical Ethernet interface consists of multiple sub-interfaces, a BFD session can be established on the physical Ethernet interface or each sub-interface.

In V200R001C01 and later versions, the following interfaces support multicast BFD sessions:
  • Physical interfaces: Layer 2 and Layer 3 Ethernet interfaces

  • Logical interfaces: Layer 2 Eth-Trunks and Layer 3 Eth-Trunks

6711c418de1945a6a6d6c41745fe9374 NOTE:
  • Multicast BFD sessions cannot be established on Layer 2 Ethernet interfaces, Layer 2 Eth-Trunks, or Layer 3 Eth-Trunks of AR100, AR120, AR150, AR160, AR200, and AR1200's SRUs.

  • When a physical Ethernet interface consists of multiple sub-interfaces, a BFD session can be established on the physical Ethernet interface or each sub-interface.

2.14.12  Which Interval Is Used If Packets on the Two Ends of a BFD Session Are Transmitted and Received In Different Intervals?

When the two ends of a BFD session have different intervals for transmitting and receiving packets, negotiation is performed between the two ends of the BFD session. The longer interval is used. Actual transmit interval = max (min-tx-interval on the local end, min-rx-interval on the peer end). Actual receive interval = max (min-rx-interval on the local end, min-tx-interval on the peer end).

2.14.13  Can a single-hop BFD session be established when a router directly connects to a PC?

No, a single-hop BFD session cannot be established in this situation. This is because the PC does not have the IP packet forwarding capability and cannot forward BFD Echo packets.

That is all I want to share with you! Thank you!

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WoodWood
Created Aug 30, 2017 06:33:18

AR Router Maintenance Guide-FAQ(Reliability)-2430963-1
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