Switching

Switching is the process by which a routing process forwards packets. The routing process switches data packets through the router by looking up the destination logical address in an address-to-port association table and then moving the packets to the selected outgoing interface. Switching performance can be enhanced by using route caches. Route caches contain information about the destination address, encapsulation type, and outgoing port number. Entries in route caches are constructed as packets are forwarded to their logical destinations.

Switching can occur at four levels, which are listed here in order of increasing performance:

Process switching. With this type of switching, an incoming packet is associated with a destination network or subnet entry in the routing table located in main memory. Process switching is a scheduled process that is performed by the system processor.
Fast switching. With this type of switching, an incoming packet matches an entry in the fast-switching cache located in main memory. Fast switching is done via asynchronous interrupts, which are handled in real time. Fast switching allows higher throughput by switching a packet using a cache created by previous packets.
Autonomous switching. With this type of switching, an incoming packet matches an entry in the autonomous-switching cache located on the interface processor. Autonomous switching provides faster packet switching by allowing the ciscoBus controller to switch packets independently without having to interrupt the system processor. It is available only on Cisco 7000 series routers and in AGS+ systems with high-speed network controller cards.
SSE switching. With this type of switching, an incoming packet matches an entry in the silicon-switching cache located in the silicon switching engine (SSE) of the Silicon Switch Processor (SSP) module. This module is available only on Cisco 7000 series routers. Silicon switching provides very fast, dedicated packet switching by allowing the SSE to switch packets independently without having to interrupt the system processor.

The first time a packet is processed for a specific destination, it is always process switched by the router. This allows the entries in the route caches to be created.

By default, fast switching is enabled on all interfaces that support fast switching.

The tables in this appendix list the types of switching supported by each router platform. For each platform, these tables include the following information:

Encapsulation type
Interface type
Routing or bridging protocol
Type of switching supported. This can be one or more of the following values:
- P: process switching
- F: fast switching
- A: autonomous switching
- S: silicon switching

Notes about Switching

The switching information provided in this appendix is general and may not apply under all circumstances.

Currently, information about switching over bridging protocols is incomplete.

If header or packet compression is enabled, packets are process switched. Fast switching is not available.

Switching Tables

The following tables identify the types of switching supported for routing protocols or bridging on various platforms:

Table F-1 : Switching Routing Protocols on the Cisco 7000 Series with a Switch Processor (SP)

Encapsulation/
Interface IP IPX DECnet AppleTalk
Phase 1 AppleTalk
Phase 2 ISO CLNS Banyan
VINES XNS Apollo
Domain

ARPA

Ethernet¹ PFA PFA PF PF PF PF PF PF P

LAN Extender PF PF P PF PF P P P P

SNAP

FDDI² PFA PFA PF --- PF PF PF PF P

Token Ring³ PFA PFA P --- PF P PF P P

Frame Relay (Cisco, IETF), ATM-DXI

Serial⁴, Channelized T1/E1⁵ PF PF P P PF P PF P ---

PRI⁵ P P P P P P P P ---

SMDS

Serial⁴ PF P P P PF P PF P P

Channelized T1/E1⁵ PF P P P P P P P P

PRI⁵ P P --- --- P P P P P

X.25

Serial⁴, Channelized T1/E1⁵, PRI⁵ P P P P P P P P P

PPP

Serial⁴, Channelized T1/E1⁵ PFA PF P P PF P PF P P

PRI⁵ PA P P P P P P P P

HDLC

Serial⁴, Channelized T1/E1⁵ PFA PFA PF P PF PF PF PF P

PRI⁵ PA PA P P P P P P P

AAL5 SNAP, AAL5 MUX, AAL5 NLPID, AAL3/4 SMDS

ATM⁶ PFA PF P PF PF PF PF P ---

AAL5 LANE

ATM⁶ PFA PF --- P PF --- --- --- ---

¹ Ethernet interfaces are available on the Ethernet Interface Processor (EIP) card.
² FDDI interfaces are available on the FDDI Interface Processor (FIP) card.
³ Token Ring interfaces are available on the Token Ring Interface Processor (TRIP) card.
⁴ Serial interfaces are available on the Fast Serial Interface Processor (FSIP) and HSSI Interface Processor (HIP) cards. The HIP card does not support X.25.
⁵ Channelized T1/E1 and PRI interfaces are available on the MultiChannel Interface Processor (MIP) card.
⁶ ATM interfaces are available on the ATM Interface Processor (AIP) card. The AIP card does not support AAL5MUX encapsulation of ISO CLNS.

Encapsulation/ Interface	IP	IPX	DECnet	AppleTalk Phase 1	AppleTalk Phase 2	ISO CLNS	Banyan VINES	XNS	Apollo Domain
ARPA
Ethernet¹	PFA	PFA	PF	PF	PF	PF	PF	PF	P
LAN Extender	PF	PF	P	PF	PF	P	P	P	P
SNAP
FDDI²	PFA	PFA	PF	---	PF	PF	PF	PF	P
Token Ring³	PFA	PFA	P	---	PF	P	PF	P	P
Frame Relay (Cisco, IETF), ATM-DXI
Serial⁴, Channelized T1/E1⁵	PF	PF	P	P	PF	P	PF	P	---
PRI⁵	P	P	P	P	P	P	P	P	---
SMDS
Serial⁴	PF	P	P	P	PF	P	PF	P	P
Channelized T1/E1⁵	PF	P	P	P	P	P	P	P	P
PRI⁵	P	P	---	---	P	P	P	P	P
X.25
Serial⁴, Channelized T1/E1⁵, PRI⁵	P	P	P	P	P	P	P	P	P
PPP
Serial⁴, Channelized T1/E1⁵	PFA	PF	P	P	PF	P	PF	P	P
PRI⁵	PA	P	P	P	P	P	P	P	P
HDLC
Serial⁴, Channelized T1/E1⁵	PFA	PFA	PF	P	PF	PF	PF	PF	P
PRI⁵	PA	PA	P	P	P	P	P	P	P
AAL5 SNAP, AAL5 MUX, AAL5 NLPID, AAL3/4 SMDS
ATM⁶	PFA	PF	P	PF	PF	PF	PF	P	---
AAL5 LANE
ATM⁶	PFA	PF	---	P	PF	---	---	---	---

Table F-2 : Switching Bridging Protocols on the Cisco 7000 Series with a Switch Processor (SP)

Encapsulation/
Interface Source-Route
Bridging Remote
Source-Route
Bridging Transparent
Bridging

ARPA

Ethernet¹ --- FA FA

SNAP

FDDI² PA FA FA

Token Ring³ --- F F

Frame Relay (Cisco, IETF), ATM-DXI

Serial⁴, Channelized T1/E1⁵ --- --- F

PRI⁵ --- --- P

SMDS

Serial⁴, Channelized T1/E1⁵, PRI⁵ --- --- P

X.25

Serial⁴, Channelized T1/E1⁵, PRI⁵ --- --- P

PPP

Serial⁴, Channelized T1/E1⁵ --- --- P

PRI⁵ --- --- PF

HDLC

Serial⁴ --- FA FA

Channelized T1/E1⁵ --- PF F

PRI⁵ --- P P

AAL5 SNAP

ATM⁶ --- --- F

AAL3/4 SMDS

ATM⁶ --- --- P

AAL5 LANE, AAL5 MUX, AAL5 NLPID

ATM⁶ --- --- ---

Direct

FDDI², Token Ring³ PFA --- ---

¹ Ethernet interfaces are available on the Ethernet Interface Processor (EIP) card.
² FDDI interfaces are available on the FDDI Interface Processor (FIP) card.
³ Token Ring interfaces are available on the Token Ring Interface Processor (TRIP) card.
⁴ Serial interfaces are available on the Fast Serial Interface Processor (FSIP) and HSSI Interface Processor (HIP) cards. The HIP card does not support X.25.
⁵ Channelized T1/E1 and PRI interfaces are available on the MultiChannel Interface Processor (MIP) card.
⁶ ATM interfaces are available on the ATM Interface Processor (AIP) card.

Encapsulation/ Interface	Source-Route Bridging	Remote Source-Route Bridging	Transparent Bridging
ARPA
Ethernet¹	---	FA	FA
SNAP
FDDI²	PA	FA	FA
Token Ring³	---	F	F
Frame Relay (Cisco, IETF), ATM-DXI
Serial⁴, Channelized T1/E1⁵	---	---	F
PRI⁵	---	---	P
SMDS
Serial⁴, Channelized T1/E1⁵, PRI⁵	---	---	P
X.25
Serial⁴, Channelized T1/E1⁵, PRI⁵	---	---	P
PPP
Serial⁴, Channelized T1/E1⁵	---	---	P
PRI⁵	---	---	PF
HDLC
Serial⁴	---	FA	FA
Channelized T1/E1⁵	---	PF	F
PRI⁵	---	P	P
AAL5 SNAP
ATM⁶	---	---	F
AAL3/4 SMDS
ATM⁶	---	---	P
AAL5 LANE, AAL5 MUX, AAL5 NLPID
ATM⁶	---	---	---
Direct
FDDI², Token Ring³	PFA	---	---

Table F-3 : Switching Routing Protocols on the Cisco 7000 Series with a Silicon Switch Processor (SSP)

Encapsulation/
Interface IP IPX DECnet AppleTalk
Phase 1 AppleTalk
Phase 2 ISO CLNS Banyan
VINES XNS Apollo
Domain

ARPA

Ethernet¹ PFAS PFAS PF PF PF PFS PF PF P

SNAP

FDDI² PFAS PFAS PF --- PF PFS PF PF P

Token Ring³ PFAS PFAS P --- PF P PF P P

Frame Relay Cisco, ATM-DXI

Serial⁴, Channelized T1/E1⁵ PF PF P P PF P PF P P

PRI⁵ P P P P P P P P P

Frame Relay IETF

Serial⁴, Channelized T1/E1⁵ PFAS PF P P PF P PF P P

PRI⁵ PAS P P P P P P P P

SMDS

Serial⁴ PF P P P PF P PF P P

Channelized T1/E1⁵ PF P P P P P P P P

PRI⁵ P P --- P P P P P P

X.25

Serial⁴, Channelized T1/E1⁵, PRI⁵ P P P P P P P P P

PPP

Serial⁴, Channelized T1/E1⁵ PFAS PF P P PF P PF P P

PRI⁵ PAS P P P P P P P P

HDLC

Serial⁴, Channelized T1/E1⁵ PFAS PFAS PF P PF PFS PF PF P

PRI⁵ PAS PAS P P P P P P P

AAL5 MUX, AAL5 NLPID, AAL5 SNAP, AAL3/4 SMDS

ATM⁶ PFAS PFS P PF PF PF PF P ---

AAL5 LANE

ATM PFAS PFS --- P PF --- --- --- ---

¹ Ethernet interfaces are available on the Ethernet Interface Processor (EIP) card.
² FDDI interfaces are available on the FDDI Interface Processor (FIP) card.
³ Token Ring interfaces are available on the Token Ring Interface Processor (TRIP) card.
⁴ Serial interfaces are available on the Fast Serial Interface Processor (FSIP) and HSSI Interface Processor (HIP) cards. The HIP card does not support X.25.
⁵ Channelized T1/E1 and PRI interfaces are available on the MultiChannel Interface Processor (MIP) card.
⁶ ATM interfaces are available on the ATM Interface Processor (AIP) card. The AIP card does not support AAL5MUX encapsulation of ISO CLNS. It also does not support silicon switching of AAL3/4 SMDS.

Encapsulation/ Interface	IP	IPX	DECnet	AppleTalk Phase 1	AppleTalk Phase 2	ISO CLNS	Banyan VINES	XNS	Apollo Domain
ARPA
Ethernet¹	PFAS	PFAS	PF	PF	PF	PFS	PF	PF	P
SNAP
FDDI²	PFAS	PFAS	PF	---	PF	PFS	PF	PF	P
Token Ring³	PFAS	PFAS	P	---	PF	P	PF	P	P
Frame Relay Cisco, ATM-DXI
Serial⁴, Channelized T1/E1⁵	PF	PF	P	P	PF	P	PF	P	P
PRI⁵	P	P	P	P	P	P	P	P	P
Frame Relay IETF
Serial⁴, Channelized T1/E1⁵	PFAS	PF	P	P	PF	P	PF	P	P
PRI⁵	PAS	P	P	P	P	P	P	P	P
SMDS
Serial⁴	PF	P	P	P	PF	P	PF	P	P
Channelized T1/E1⁵	PF	P	P	P	P	P	P	P	P
PRI⁵	P	P	---	P	P	P	P	P	P
X.25
Serial⁴, Channelized T1/E1⁵, PRI⁵	P	P	P	P	P	P	P	P	P
PPP
Serial⁴, Channelized T1/E1⁵	PFAS	PF	P	P	PF	P	PF	P	P
PRI⁵	PAS	P	P	P	P	P	P	P	P
HDLC
Serial⁴, Channelized T1/E1⁵	PFAS	PFAS	PF	P	PF	PFS	PF	PF	P
PRI⁵	PAS	PAS	P	P	P	P	P	P	P
AAL5 MUX, AAL5 NLPID, AAL5 SNAP, AAL3/4 SMDS
ATM⁶	PFAS	PFS	P	PF	PF	PF	PF	P	---
AAL5 LANE
ATM	PFAS	PFS	---	P	PF	---	---	---	---

Table F-4 : Switching Bridging Protocols on the Cisco 7000 Series with a Silicon Switch Processor (SSP)

Encapsulation/
Interface Source-Route
Bridging Remote
Source-Route
Bridging Transparent
Bridging

ARPA

Ethernet¹ --- PFAS FAS

SNAP

FDDI² --- PFAS FAS

Token Ring³ PAS PA PFA

Frame Relay (Cisco, IETF), ATM-DXI

Serial⁴, Channelized T1/E1⁵ --- --- F

PRI⁵ --- --- P

SMDS

Serial⁴, Channelized T1/E1⁵ --- --- P

PRI⁵ --- --- P

X.25

Serial⁴, Channelized T1/E1⁵, PRI⁵ --- --- P

PPP

Serial⁴ --- --- PFA

Channelized T1/E1⁵ --- --- PF

PRI⁵ --- --- P

HDLC

Serial⁴ --- PFAS PFAS

Channelized T1/E1⁵ --- PFS PFS

PRI⁵ --- P P

AAL5 SNAP

ATM⁶ --- --- F

AAL3/4 SMDS

ATM⁶ --- --- P

AAL5 LANE, AAL5 MUX, AAL5 NLPID

ATM⁶ --- --- ---

Direct

FDDI², Token Ring³ PFAS --- ---

¹ Ethernet interfaces are available on the Ethernet Interface Processor (EIP) card.
² FDDI interfaces are available on the FDDI Interface Processor (FIP) card.
³ Token Ring interfaces are available on the Token Ring Interface Processor (TRIP) card.
⁴ Serial interfaces are available on the Fast Serial Interface Processor (FSIP) and HSSI Interface Processor (HIP) cards. The HIP card does not support X.25.
⁵ Channelized T1/E1 and PRI interfaces are available on the MultiChannel Interface Processor (MIP) card.
⁶ ATM interfaces are available on the ATM Interface Processor (AIP) card.

Encapsulation/ Interface	Source-Route Bridging	Remote Source-Route Bridging	Transparent Bridging
ARPA
Ethernet¹	---	PFAS	FAS
SNAP
FDDI²	---	PFAS	FAS
Token Ring³	PAS	PA	PFA
Frame Relay (Cisco, IETF), ATM-DXI
Serial⁴, Channelized T1/E1⁵	---	---	F
PRI⁵	---	---	P
SMDS
Serial⁴, Channelized T1/E1⁵	---	---	P
PRI⁵	---	---	P
X.25
Serial⁴, Channelized T1/E1⁵, PRI⁵	---	---	P
PPP
Serial⁴	---	---	PFA
Channelized T1/E1⁵	---	---	PF
PRI⁵	---	---	P
HDLC
Serial⁴	---	PFAS	PFAS
Channelized T1/E1⁵	---	PFS	PFS
PRI⁵	---	P	P
AAL5 SNAP
ATM⁶	---	---	F
AAL3/4 SMDS
ATM⁶	---	---	P
AAL5 LANE, AAL5 MUX, AAL5 NLPID
ATM⁶	---	---	---
Direct
FDDI², Token Ring³	PFAS	---	---

Table F-5 : Switching Routing Protocols on the AGS+

Encapsulation/
Interface¹ IP IPX DECnet AppleTalk
Phase 1 AppleTalk
Phase 2 ISO CLNS Banyan
VINES XNS Apollo
Domain

ARPA

Ethernet (ciscoBus)² PFA PFA PF PF PF PF PF PF P

Ethernet (Multibus)³ PF PF PF PF --- PF PF PF P

SNAP

FDDI⁴ PFA PFA PF --- PF PF PF PF P

Token Ring (ciscoBus)⁵ PFA PFA P --- PF P P P ---

Token Ring (Multibus)⁶ PF PF P --- PF P PF P ---

Frame Relay (Cisco, IETF)

Serial (all)⁷^,⁸ PF PF P P PF P PF P P

SMDS

Serial (all)⁷^,⁸ PF P P P PF P PF P P

X.25

Serial (Multibus)⁸ P P P P P P P P P

PPP

Serial (ciscoBus)⁷ PFA PF P P PF P PF P P

Serial (Multibus)⁸ PF PF P P PF P PF P P

HDLC

Serial (ciscoBus)⁷ PFA --- PF P PF PF PF PF P

Serial (Multibus)⁸ PF --- PF P PF PF PF PF P

¹ This table lists all switching possibilities. The actual switching available depends on the microcode version.
² CiscoBus Ethernet interfaces are available on the CSC-C2MEC cards.
³ Multibus Ethernet interfaces are available on CSC-nE cards.
⁴ FDDI interfaces are available on the CSC-FCI and CSC-C2FCIT cards.
⁵ CiscoBus Token Ring interfaces are available on the CSC-C2CTR card.
⁶ Multibus Token Ring interfaces are available on the CSC-nR and CSC-R16M cards.
⁷ CiscoBus serial interfaces are available on the CSC-C2HSCI card.
⁸ Multibus serial interfaces are available on CSC-nS and CSC-nT cards.

Encapsulation/ Interface¹	IP	IPX	DECnet	AppleTalk Phase 1	AppleTalk Phase 2	ISO CLNS	Banyan VINES	XNS	Apollo Domain
ARPA
Ethernet (ciscoBus)²	PFA	PFA	PF	PF	PF	PF	PF	PF	P
Ethernet (Multibus)³	PF	PF	PF	PF	---	PF	PF	PF	P
SNAP
FDDI⁴	PFA	PFA	PF	---	PF	PF	PF	PF	P
Token Ring (ciscoBus)⁵	PFA	PFA	P	---	PF	P	P	P	---
Token Ring (Multibus)⁶	PF	PF	P	---	PF	P	PF	P	---
Frame Relay (Cisco, IETF)
Serial (all)⁷^,⁸	PF	PF	P	P	PF	P	PF	P	P
SMDS
Serial (all)⁷^,⁸	PF	P	P	P	PF	P	PF	P	P
X.25
Serial (Multibus)⁸	P	P	P	P	P	P	P	P	P
PPP
Serial (ciscoBus)⁷	PFA	PF	P	P	PF	P	PF	P	P
Serial (Multibus)⁸	PF	PF	P	P	PF	P	PF	P	P
HDLC
Serial (ciscoBus)⁷	PFA	---	PF	P	PF	PF	PF	PF	P
Serial (Multibus)⁸	PF	---	PF	P	PF	PF	PF	PF	P

Table F-6 : Switching Bridging Protocols on the AGS+

Encapsulation/
Interface¹ Source-Route
Bridging Remote
Source-Route
Bridging Transparent
Bridging

ARPA

Ethernet (high speed)² --- PFA PFA

Ethernet (low speed)³ --- PF PF

SNAP

FDDI⁴ --- PFA PFA

Token Ring (high speed)⁵ --- PFA PFA

Token Ring (4 Mbps, 16 Mbps)⁶ --- PF PF

HDLC

Serial (high speed)⁷ --- PFA PFA

Serial (low speed)⁸ --- PF ---

Direct

Token Ring (high speed)⁵ PFAS --- ---

Token Ring (4 Mbps, 16 Mbps)⁶ PF --- ---

¹ This table lists all switching possibilities. The actual switching available depends on the microcode version.
² High-speed Ethernet interfaces are available on the CSC-C2MEC cards.
³ Low-speed Ethernet interfaces are available on CSC-nE cards.
⁴ FDDI interfaces are available on the CSC-C2FCIT card.
⁵ High-speed Token Ring interfaces are available on the CSC-C2CTR card.
⁶ 4-Mbps and 16-Mbps Token Ring interfaces are available on the CSC-nR and CSC-R16M cards, respectively.
⁷ High-speed serial interfaces are available on the CSC-C2HSCI card.
⁸ Low-speed serial interfaces are available on CSC-nS and CSC-nT cards.

Encapsulation/ Interface¹	Source-Route Bridging	Remote Source-Route Bridging	Transparent Bridging
ARPA
Ethernet (high speed)²	---	PFA	PFA
Ethernet (low speed)³	---	PF	PF
SNAP
FDDI⁴	---	PFA	PFA
Token Ring (high speed)⁵	---	PFA	PFA
Token Ring (4 Mbps, 16 Mbps)⁶	---	PF	PF
HDLC
Serial (high speed)⁷	---	PFA	PFA
Serial (low speed)⁸	---	PF	---
Direct
Token Ring (high speed)⁵	PFAS	---	---
Token Ring (4 Mbps, 16 Mbps)⁶	PF	---	---

Table F-7 : Switching on the Cisco 4500

Encapsulation/
Interface IP IPX DECnet AppleTalk
Phase 1 AppleTalk
Phase 2 ISO CLNS Banyan
VINES XNS Bridging

ARPA

Ethernet¹ PF PF PF PF PF PF PF PF PF

SNAP

FDDI² PF PF PF --- PF PF PF PF PF

Token Ring³ PF PF P --- PF P PF PF PF

Frame Relay Cisco, ATM-DXI

Serial⁴ PF PF P P PF P PF P F

BRI/PRI⁵ P P P P P P P P P

Frame Relay IETF

Serial⁴ PF --- --- --- --- P PF --- P

BRI/PRI⁵ P P P P P P P P P

SMDS

Serial⁴ PF P P P P --- PF P P

BRI/PRI⁵ P P P P P P P P P

X.25

Serial⁴, BRI/PRI⁵ P P P P P P P P P

PPP

Serial⁴ PF PF P P PF P PF P P

BRI/PRI⁵ P P P P P P P P

HDLC

Serial⁴ PF PF PF P PF PF PF PF PF

BRI/PRI⁵ P P P P P P P P PF

AAL5 SNAP, AAL5 MUX, AAL5 NLPID

ATM⁶ PF PF P P P P P P P

¹ Ethernet interfaces are available on the Ethernet network processor module.
² FDDI interfaces are available on the FDDI network processor module.
³ Token Ring interfaces are available on the Token Ring network processor module.
⁴ Serial interfaces are available on the serial network processor modules.
⁵ BRI and PRI interfaces are available on the ISDN BRI network processor module.
⁶ ATM interfaces are provided on the Network Processor Module (NPM).

Encapsulation/ Interface	IP	IPX	DECnet	AppleTalk Phase 1	AppleTalk Phase 2	ISO CLNS	Banyan VINES	XNS	Bridging
ARPA
Ethernet¹	PF	PF	PF	PF	PF	PF	PF	PF	PF
SNAP
FDDI²	PF	PF	PF	---	PF	PF	PF	PF	PF
Token Ring³	PF	PF	P	---	PF	P	PF	PF	PF
Frame Relay Cisco, ATM-DXI
Serial⁴	PF	PF	P	P	PF	P	PF	P	F
BRI/PRI⁵	P	P	P	P	P	P	P	P	P
Frame Relay IETF
Serial⁴	PF	---	---	---	---	P	PF	---	P
BRI/PRI⁵	P	P	P	P	P	P	P	P	P
SMDS
Serial⁴	PF	P	P	P	P	---	PF	P	P
BRI/PRI⁵	P	P	P	P	P	P	P	P	P
X.25
Serial⁴, BRI/PRI⁵	P	P	P	P	P	P	P	P	P
PPP
Serial⁴	PF	PF	P	P	PF	P	PF	P	P
BRI/PRI⁵	P	P	P	P	P	P	P	P
HDLC
Serial⁴	PF	PF	PF	P	PF	PF	PF	PF	PF
BRI/PRI⁵	P	P	P	P	P	P	P	P	PF
AAL5 SNAP, AAL5 MUX, AAL5 NLPID
ATM⁶	PF	PF	P	P	P	P	P	P	P

Table F-8 : Switching on the Cisco 4000 and Cisco 4000-M

Encapsulation/
Interface IP IPX DECnet AppleTalk Phase 1 AppleTalk Phase 2 ISO CLNS Banyan VINES XNS Bridging

ARPA

Ethernet¹ PF PF PF PF PF PF PF PF F

SNAP

FDDI² PF PF P --- PF PF PF PF F

Token Ring³ PF PF P --- PF P PF PF F

Frame Relay (Cisco, IETF), ATM-DXI

Serial⁴ PF P P P PF P P P F

BRI/PRI⁵ P P P P P P P P P

SMDS

Serial⁴ PF P P P PF P P P P

BRI/PRI⁵ P P P P P P P P P

X.25

Serial⁴, BRI/PRI⁵ P P P P P P P P P

PPP

Serial⁴ PF P P P PF P P P P

BRI/PRI⁵ P P P P P P P P P

HDLC

Serial⁴ PF PF P P PF PF PF PF F

BRI/PRI⁵ P P P P P P P P PF

AAL5 SNAP, AAL5 MUX, AAL5 NLPID

ATM⁶ F F P P P P P P P

¹ Ethernet interfaces are available on the Ethernet network processor module.
² FDDI interfaces are available on the FDDI network processor module.
³ Token Ring interfaces are available on the Token Ring network processor module.
⁴ Serial interfaces are available on the serial network processor modules.
⁵ BRI and PRI interfaces are available on the ISDN BRI network processor module. The channelized E1 and channelized T1 controllers for the Cisco 4000 and Cisco 4500 can also be configured to run ISDN PRI.
⁶ ATM interfaces are provided on the Network Processor Module (NPM).

Encapsulation/ Interface	IP	IPX	DECnet	AppleTalk Phase 1	AppleTalk Phase 2	ISO CLNS	Banyan VINES	XNS	Bridging
ARPA
Ethernet¹	PF	PF	PF	PF	PF	PF	PF	PF	F
SNAP
FDDI²	PF	PF	P	---	PF	PF	PF	PF	F
Token Ring³	PF	PF	P	---	PF	P	PF	PF	F
Frame Relay (Cisco, IETF), ATM-DXI
Serial⁴	PF	P	P	P	PF	P	P	P	F
BRI/PRI⁵	P	P	P	P	P	P	P	P	P
SMDS
Serial⁴	PF	P	P	P	PF	P	P	P	P
BRI/PRI⁵	P	P	P	P	P	P	P	P	P
X.25
Serial⁴, BRI/PRI⁵	P	P	P	P	P	P	P	P	P
PPP
Serial⁴	PF	P	P	P	PF	P	P	P	P
BRI/PRI⁵	P	P	P	P	P	P	P	P	P
HDLC
Serial⁴	PF	PF	P	P	PF	PF	PF	PF	F
BRI/PRI⁵	P	P	P	P	P	P	P	P	PF
AAL5 SNAP, AAL5 MUX, AAL5 NLPID
ATM⁶	F	F	P	P	P	P	P	P	P

Table F-9 : Switching on the Cisco 2500 Series

Encapsulation/
Interface¹ IP IPX DECnet AppleTalk Phase 2 ISO CLNS Banyan VINES XNS Bridging

ARPA

Ethernet PF PF PF PF PF PF PF PF

SNAP

Token Ring PF PF P PF PF PF P PF

Frame Relay (Cisco, IETF), ATM-DXI

Serial PF PF P P P PF P P

BRI/PRI P P P P P P P P

SMDS

Serial PF P P PF P PF P P

BRI/PRI P P P P P P P P

X.25

Serial, BRI/PRI P P P P P P P P

PPP

Serial PF P P PF P PF P P

BRI/PRI P P P P P P P P

HDLC

Serial PF PF PF PF PF PF PF PF

BRI/PRI P P P P P P P PF

¹ Available interfaces depend on the Cisco 2500 series model.

Encapsulation/ Interface¹	IP	IPX	DECnet	AppleTalk Phase 2	ISO CLNS	Banyan VINES	XNS	Bridging
ARPA
Ethernet	PF	PF	PF	PF	PF	PF	PF	PF
SNAP
Token Ring	PF	PF	P	PF	PF	PF	P	PF
Frame Relay (Cisco, IETF), ATM-DXI
Serial	PF	PF	P	P	P	PF	P	P
BRI/PRI	P	P	P	P	P	P	P	P
SMDS
Serial	PF	P	P	PF	P	PF	P	P
BRI/PRI	P	P	P	P	P	P	P	P
X.25
Serial, BRI/PRI	P	P	P	P	P	P	P	P
PPP
Serial	PF	P	P	PF	P	PF	P	P
BRI/PRI	P	P	P	P	P	P	P	P
HDLC
Serial	PF	PF	PF	PF	PF	PF	PF	PF
BRI/PRI	P	P	P	P	P	P	P	PF

Table F-10 : Switching Routing Protocols on the Cisco 7500 Series with a Route Switch Processor (RSP)

Encapsulation/
Interface IP IPX DECnet AppleTalk
Phase 1 AppleTalk
Phase 2 ISO CLNS Banyan
VINES XNS Apollo
Domain Bridging

ARPA

Ethernet¹ PFA PF PF PF PF PF PF PF P F

SNAP

FDDI² PFA PF PF --- PF PF PF PF P F

Token Ring³ PF PF P --- PF P PF P P F

Frame Relay (Cisco, IETF), ATM-DXI

Serial⁴, Channelized T1/E1⁵ PF PF P P PF P PF P --- F

PRI⁵ PF PF P P P P P P ---

SMDS

Serial⁴ PF P P P PF P PF P P P

Channelized T1/E1⁵ PF P P P P P P P P P

PRI⁵ PF PF P P P P P P P

X.25

Serial⁴, Channelized T1/E1⁵, PRI⁵ P P P P P P P P P P

PPP

Serial⁴, Channelized T1/E1⁵ PF PF P P PF P PF P P P

PRI⁵ PF PF P P P P P P P P

HDLC

Serial⁴, Channelized T1/E1⁵ PFA PF PF P PF PF PF PF P F

PRI⁵ PF PF PF P P P P P P P

AAL3/4 SMDS, AAL5 SNAP, AAL5 MUX, AAL5 NLPID

ATM⁶ PF PF P PF PF PF⁶ PF P --- P

¹ Ethernet interfaces are available on the Ethernet Interface Processor (EIP) card.
² FDDI interfaces are available on the FDDI Interface Processor (FIP) card.
³ Token Ring interfaces are available on the Token Ring Interface Processor (TRIP) card.
⁴ Serial interfaces are available on the Fast Serial Interface Processor (FSIP) and HSSI Interface Processor (HIP) cards. The HIP card does not support X.25.
⁵ Channelized T1/E1 and PRI interfaces are available on the MultiChannel Interface Processor (MIP) card.
⁶ ATM interfaces are available on the ATM Interface Processor (AIP) card. The AIP card does not support AAL5MUX encapsulation of ISO CLNS.

Table of Contents

Switching

Switching

Notes about Switching

Switching Tables